Stop_Start Disable, Inhibit, and Restart Reasons

Stop/Start Disable, Inhibit, and Restart Reasons

Note

Not all parameters may be available in all vehicles The following Autostop Disable parameters are only valid when Engine is Running. It indicated why are we currently inhibiting autostop at that moment in time. Autostop Disable

	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Autostop Disable Reason - Transmission Range	Engine Running	Transmission not in Drive.	No	Ensure transmission is in drive. Stop/start will not function in manual mode.	If OK: Inform Customer - Normal Disable Condition If not OK: Refer to transmission diagnostics.
	Autostop Disable Reason - Passenger Compartment Heater On	Engine Running	Passenger Compartment Heater ON.	No	Turn off passenger compartment heater.	As Required.
	Autostop Disable Reason - Driver Exited Vehicle	Engine Running	Seat belt un buckled and driver’s door opened.	No	Make sure driver’s seatbelt is secured and driver’s door latch is closed.	As Required.
	Autostop Disable Reason - 12V Start Counter Exceeded	Engine Running	Backup Start Performed indicates that an autostop was prevented due to the expiration of backup start counter. If the motor generator cannot autostart the ICE, a calibratable number of	No	Determine cause of the previous no start condition.	As Required.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
			start the engine with the 12V starter will be performed.
	Autostop Disable Reason - Vehicle Inclination	Engine Running	Vehicle Grade indicates that an autostop was prevented (or an autostart was commanded) due to the current grade level of the vehicle.	No	Verify vehicle is not on level ground.	If not OK: Verify Multi- Axis Accelerator Sensor.
	Autostop Disable Reason - Remote Vehicle Start Request	Engine Running	Remote Start indicates the internal combustion engine has been requested to run through a remote start command.	No	Verify remote start operation.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Acceleration Request	Engine Running	Driveability indicates an autostart was command based on torque conditions requested from the driver (generally a tip-in on the throttle). When this condition is detected, autostops are disallowed.	No	Ensure accelerator pedal is fully released.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Transmission In Reverse	Engine Running	Transmission in reverse gear.	No	Ensure transmission is in drive. Stop/start will not function in any other mode.	If OK: Inform Customer - Normal Disable Condition.

Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
Autostop Disable Reason - Reduced Engine Power Active	Engine Running	Reduced Power indicates that AutoStops are disallowed when a situation has been detected that causes the vehicle to operate with reduced power.	No	Check ECM DTC’s.	As Required.
Autostop Disable Reason - HYBRID/EV Battery Pack Temperature	Engine Running	HV Battery Pack Temperature indicates Disallow AutoStops/Comm AutoStart when battery temperature is high.	No and	Ensure parameter in scan tool is not indicating high. Check DTC’s.	If OK: Inform Customer - Normal Disable Condition.
Autostop Disable Reason - Transmission Range	Engine Running	Transmission Range indicates that an autostop was prevented (or an autostart was commanded) due to the selected transmission range.	No	Ensure transmission is in drive. Stop/start will not function in manual mode.	If OK: Inform Customer - Normal Disable Condition.
Autostop Disable Reason - Ignition Switch Start	Engine Running	Key Forced AutoStart Request: The driver can request an autostart in park or neutral by cranking the key. Autostops are not allowed again until out of park/neutral.	No	As required.	If OK: Inform Customer - Normal Disable Condition.

	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Autostop Disable Reason - TCM Request	Engine Running	TCM Override indicates that AutoStops are disallowed based on transmission PRNDL position.	No	Ensure transmission is in drive. Stop/start will not function in manual mode.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - System Optimization	Engine Running	System Optimization indicates Command AutoStart based on overall system conditions (engine speed & torque optimization). When this condition is detected, AutoStops are disallowed.	No	Ensure vehicle is over 3MPH/5KMH before autostop is enabled.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - System Voltage Low	Engine Running	12V battery state of function low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostop Disable Reason - Engine Coolant Temperature Out Of Range	Engine Running	Engine Coolant Temperature indicates that an autostop was prevented (or an autostart was commanded) due to engine coolant temperature out of range (high or low).	No	Ensure coolant temperature isn’t too high or low.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason	Engine Running	Catalyst indicates a	No	Ensure catalyst parameter isn’t	If OK: Inform Customer -
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	- Catalyst Test In Progress		inhibit for Catalyst monitor from gas or Diesel.			Normal Disable Condition.
	Autostop Disable Reason - HO2S Test In Progress	Engine Running	Oxygen Sensor indicates a requested inhibit for Oxygen Sensor Monitor.	No	Ensure oxygen sensor parameter isn’t out of range.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Misfire Test In Progress	Engine Running	Misfire Monitor indicates a requested inhibit for Misfire Monitor.	No	Ensure no misfire detected in scan tool.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Catalyst not at Operating Temperature	Engine Running	Catalyst not at Operating Temperature.	No	Ensure Catalyst is within operating temperature.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Intake Manifold Temperature Too High	Engine Running	Engine Manifold Temperature indicates an inhibit due to high Manifold Temp.	No	Ensure Manifold Temperature isn’t high.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Engine Speed Test in Progress	Engine Running	Engine Speed Diagnostics indicates a requested inhibit due to Engine Speed diagnostics.	No	As Required.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - MAF sensor Test In Progress	Engine Running	Mass Air Flow Diagnostics indicates a requested inhibit due to MAF diagnostics.	No	Check ECM DTC’s.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason	Engine Running	Manifold Absolute	No	Check ECM DTC’s.	If OK: Inform Customer -
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	- MAP Sensor Test In Progress		Pressure Diagnostics indicates a requested inhibit due to MAP diagnostics.			Normal Disable Condition.
	Autostop Disable Reason - Engine Oil Temperature Too High	Engine Running	Engine Oil Temp indicates an inhibit due to high Engine Oil Temp.	No	Check Oil temperature is not too high.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Engine Stop/Start Test in Progress	Engine Running	Starting System indicates an inhibit due to Engine Start Stop functions.	No	Ensure control functions are done before proper function of stop/start.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Engine Coolant Temperature Test In Progress	Engine Running	Engine Coolant Temperature indicates a requested inhibit due to low or high Engine Coolant Temperature.	No	Ensure control function is done before expecting stop/start to function.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - EVAP System Test In Progress	Engine Running	Evap System indicates a requested inhibit for Evap System Monitor.	No	Ensure control function is complete before stop/start can function.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Fuel Injector Test In Progress	Engine Running	Fuel Injector Diagnostics indicates a requested inhibit due to Fuel Injector diagnostics.	No	Ensure control function is complete before stop/start can function.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Fuel Pressure Test In Progress	Engine Running	Fuel Pressure indicates a requested inhibit for Fuel	No	Ensure control function is complete before	If OK: Inform Customer - Normal Disable Condition.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
			Pressure Pump monitor.		stop/start can function.
	Autostop Disable Reason - Fuel System Test In Progress	Engine Running	Fuel Systems indicates a requested inhibit for Fuel Systems monitor.	No	Ensure control function is complete before stop/start can function.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Parking Maneuver Detected	Engine Running	Parking maneuver detection indicates a requested inhibit due to parking maneuver active.	No	Check functionality after parking.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - High Engine Rotating Torque	Engine Running	Engine Friction indicates a requested inhibit due to cold engine, friction high.	No	Wait for vehicle to reach proper temperature.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - BARO Pressure Too Low	Engine Running	Ambient Air Pressure indicates a requested inhibit due to low Barometric Pressure.	No	Ensure barometric temperature isn’t too low in scan tool.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Fuel Temperature Too High	Engine Running	Boil Off Diagnostics indicates a requested inhibit due to Fuel Boil Off diagnostics.	No	Ensure fuel temperature isn’t too high.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - System Malfunction	Engine Running	Starting System indicates that a condition in the starting system has been detected that	No	Check ECM DTC’s.	If OK: Inform Customer - Normal Disable Condition.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
			a re-start of the vehicle and thus, autostops, have been disabled.
	Autostop Disable Reason - Turbocharger Temperature Too High	Engine Running	Turbo Temp indicates an inhibit due to high Turbo Temp.	No	Check ECM DTC’s.	If OK: Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Hood Ajar	Engine Running	Hood not latched.	No	Ensure hood is closed and latched.	If OK: Refer to Hood Ajar Malfunction. If not OK: close hood.
	Autostop Disable Reason - ECM Request	Engine Running	ECM tasks are currently running that will not allow an autostop.	No	Autostop will function once the task is complete.	Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Run/Crank Not Active	Engine Running	Vehicle must be in Run Mode.	No	Verify ECM Run/Crank signal.	If OK: Inform Customer - Normal Disable Condition. If not OK: refer to Power Mode Mismatch.
	Autostop Disable Reason - Minimum Engine Run Time Not Met	Engine Running	Engine must run a minimum time before stop/start is allowed.	No	Autostop will function once the minimum run time is met.	Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Control Function Active	Engine Running	Scantool control function active.	No	Release control function in scantool.	None
	Autostop Disable Reason - Auxiliary Transmission Fluid	Engine Running	Transmission aux pump or accumulator not available.	No	Check for transmission DTCs, refer to automatic transmission	As Required.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Pump/Accumulat Not Available	or			service information.
	Autostop Disable Reason - Engine Coolant Temperature Out of Range	Engine Running	Coolant temperature too hot or cold.	No	Verify cooling temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to Engine Heating and Cooling diagnostics.
	Autostop Disable Reason - Invalid Data Received	Engine Running	ECM has received invalid data.	No	Check ECM DTC’s.	As Required.
	Autostop Disable Reason - Vehicle Speed Too High	Engine Running	Vehicle speed detected.	No	Ensure vehicle is at a complete stop.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to SI.
	Autostop Disable Reason - Transmission Fluid Temperature Out of Range	Engine Running	Transmission temperature too hot or cold.	No	Verify transmission temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to transmission diagnostics.
	Autostop Disable Reason - Brake Pedal Released	Engine Running	Brake pedal not pressed (enough).	No	Ensure brake pedal is pressed sufficiently to active autostop.	If OK: Inform Customer - Normal Disable Condition. If not OK: Verify brake pedal switch operation and calibration.
	Autostop Disable Reason - Brake Booster Weak Vacuum	Engine Running	Weak brake booster vacuum.	No	Ensure brake booster vacuum is within normal	Check DTCs. Refer to brake booster diagnostics.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
					operating values.
	Autostop Disable Reason - Accelerator Pedal Pressed	Engine Running	Accelerator pedal pressed.	No	Ensure accelerator pedal is fully released.	If OK: Inform Customer - Normal Disable Condition. If not OK: Ensure pedal sensor operation and calibration.
	Autostop Disable Reason - A/C Request	Engine Running	HVAC system is requesting AC compressor due to high cabin temperature and/or humidity.	No	Allow cabin temperature/hum to reach setpoint, change setpoint, turn off blower.	idity Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Low-Voltage Battery Voltage Low	Engine Running	12V battery voltage is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostop Disable Reason - Low-Voltage Battery State of Health Low	Engine Running	12V battery has low state of health.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostop Disable Reason - Low-Voltage Battery State of Charge Low	Engine Running	12V battery state of charge is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostop Disable Reason - Low-Voltage Battery	Engine Running	Excessive current draw is placing a high demand on the	No	Check electrical loads, turn off unnecessary	Inform Customer - Normal Disable Condition.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Discharge Current High
	Autostop Disable Reason - Intake Manifold Weak Vacuum	Engine Running	Low manifold vacuum.	No	Verify manifold vacuum.	Check DTCs, refer to SI.
	Autostop Disable Reason - Engine Speed High	Engine Running	High idle condition.	No	Correct cause of high idle.	Check DTCs, refer to SI.
	Autostop Disable Reason - Wheel Slip Detected	Engine Running	Slippery road conditions.	No	Ensure good road conditions.	Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Vehicle Speed Threshold Not Reached	Engine Running	Vehicle must reach a minimum speed.	No	Operate at sufficient speeds.	Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Maximum Vehicle Stop Time Exceeded	Engine Running	Engine was shut off for maximum allowable off time.	No	Operate at sufficient speeds to reactivate.	Inform Customer - Normal Disable Condition.
	Autostop Disable Reason - Starter System Malfunction	Engine Running	Starter System Inoperable.	No	Check ECM DTCs, refer to SI.	As Required.
	Autostop Disable Reason - System Malfunction	Engine Running	Starter System Inoperable.	No	Check for Vehicle DTCs.	As Required.
	Autostop Disable Reason - Stop/Start Select Switch	Engine Running	Switch not enabled.	No	Turn switch on.	If OK: Inform Customer – Normal Disable Condition. If Not OK: refer to Stop/Start
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Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
					System Malfunction.
Autostop Disable Reason - Idle Boost Mode Active	Engine Running	Idle boost requested.	No	Check electrical loads, turn off unnecessary loads.	Inform Customer - Normal Disable Condition.
Autostop Disable Reason - Generator Load High	Engine Running	Excessive current draw is placing a high demand on the generator.	No	Check electrical loads, turn off unnecessary loads.	Inform Customer - Normal Disable Condition.
Autostop Disable Reason - Clutch Pedal Applied	Engine Running	Clutch pedal (manual trans) not released.	No	Ensure clutch pedal is released.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to clutch switch diagnostic and verify calibration.
Autostop Disable Reason - Low-Voltage Battery Temperature Out of Range	Engine Running	Battery temperature too cold or hot.	No	Ensure battery is kept within normal operating range.	Inform Customer - Normal Disable Condition.
Autostop Disable Reason - Low-Voltage Battery State of Function Low	Engine Running	12V battery state of function low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.

The following Autostart Inhibit parameters show why the engine is off or was turned off. There are a couple different things this can mean. Forced Off (Mostly Hybrid), Propulsion System Shutdown (Stall), Cannot Start Engine (Hybrid). Autostart Inhibit

	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Autostart Inhibit Reason - Hood Ajar	Engine off	Hood not latched.	No	Ensure hood is closed and latched.	If not OK: close hood.
	Autostart Inhibit Reason - ECM Request	Engine off	ECM tasks are currently running that will not allow an autostart.	No	Autostop will function once the task is complete.	Inform Customer - Normal Disable Condition.
	Autostart Inhibit Reason - Run/Crank Not Active	Engine off	Vehicle must be in Run Mode.	No	Verify ECM Run/Crank signal.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Inhibit Reason - System Malfunction	Engine off	Vehicle System Issue.	No	Check for Vehicle DTCs.	As Required.
	Autostart Inhibit Reason - Autostart Not Commanded	Engine off	Vehicle is in a normal autostop mode.	Yes	None	Inform Customer - Normal Disable Condition.
	Autostart Inhibit Reason - Crank Aborted	Engine off	ECM has disabled propulsion system	No	Check ECM DTCs.	As Required.
	Autostart Inhibit Reason - Control Function Active	Engine off	Scantool control function active.	No	Release control function in scantool.	As Required.
	Autostart Inhibit Reason - ECM Malfunction	Engine off	ECM has disabled propulsion system.	No	Check ECM DTCs.	As Required.
	Autostart Inhibit Reason - Autostart/Autost Malfunction	Engine off op	ECM has disabled propulsion system.	No	Check ECM DTCs.	As Required.
	Autostart Inhibit Reason	Engine off	Seat belt unbuckled and	No	Not in all vehicles.	If OK: Inform Customer -
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Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
- Driver Exited Vehicle		driver’s door opened.		and driver’s door switches.	Normal Disable Condition.
Autostart Inhibit Reason - Engine Coolant Temperature Out of Range	Engine off	Coolant temperature too hot or cold.	No	Verify cooling temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition.
Autostart Inhibit Reason - Remote Vehicle Start Disabled	Engine off	Remote Vehicle Start Disabled.	No	As Required.	As Required.
Autostart Inhibit Reason - Calibration Override	Engine off	Calibration forced to shut off by calibration.	No	Verify cooling temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition.
Autostart Inhibit Reason - Compression Test	Engine off	Engine was forced to shut off following the completion of a compression test.	No	As Required.	As Required.
Autostart Inhibit Reason - TCM Request	Engine off	TCM can force the engine off depending on transmission conditions.	No	As Required.	If OK: Inform Customer - Normal Disable Condition.
Autostart Inhibit Reason - Engine Stop Required	Engine off	Detection of a situation that might otherwise cause a stall of the vehicle.	No	As Required.	As Required.

The following Autostart Reasons parameters are only valid when Engine is Running. It indicates why we started the engine the last time it was autostarted. Autostart Reasons

	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Autostart Reason - TCM Demand	Engine Running	TCM has requested an autostart.	No	Ensure transmission is in drive. Stop/start will not function in manual mode.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to transmission diagnostics.
	Autostart Reason - Reduced Engine Power Active	Engine Running	ECM has requested Reduced Engine Power	No	Check ECM DTCs.	As Required.
	Autostart Reason - Maximum Autostop Time Exceeded	Engine Running	Maximum autostop time is limited.	No	Maximum autostop time is typically 2 minutes.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Transmission Fluid Temperature Out of Range	Engine Running	Transmission temperature too hot or cold.	No	Verify transmission temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to transmission diagnostics.
	Autostart Reason - System Malfunction	Engine Running	Vehicle System Issue.	No	Check for Vehicle DTCs.	As Required.
	Autostart Reason - Transmission in Reverse	Engine Running	Transmission was placed in reverse.	No	Ensure transmission is in drive.	If OK: Inform Customer - Normal Disable Condition. If not OK: Refer to transmission diagnostics.
	Autostart Reason - Invalid Data Received	Engine Running	ECM has received invalid data.	No	Check ECM DTCs.	As Required.

Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
Autostart Reason - Vehicle Speed Too High	Engine Running	Vehicle speed detected.	No	Ensure vehicle is at a complete stop.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - System Optimization	Engine Running	ECM has determined that the engine needs to be started.	No	Check DTCs.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - System Voltage Low	Engine Running	12V battery state of charge is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - Acceleration Request	Engine Running	Accelerator pedal pressed.	No	Ensure accelerator pedal is fully released.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - Minimum Engine Run Time Not Met	Engine Running	Engine must run a minimum time before stop/start is allowed.	No	Autostop will function once the minimum run time is met.	Inform Customer - Normal Disable Condition.
Autostart Reason - Control Function Active	Engine Running	Scantool control function active.	No	Release control function in scantool.	As Required.
Autostart Reason - Auxiliary Transmission Fluid Pump/Accumulat Not Available	Engine Running or	Transmission aux pump or accumulator not available.	No	Check for transmission DTCs, refer to automatic transmission service information.	As Required.
Autostart Reason - Engine Coolant Temperature Out of Range	Engine Running	Coolant temperature too hot or cold.	No	Verify cooling temperature is within normal operating values.	If OK: Inform Customer - Normal Disable Condition.

	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
	Autostart Reason - Transmission Range	Engine Running	Transmission not in Drive.	No	Ensure transmission is in drive. Stop/start will not function in manual mode.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Hood Ajar	Engine Running	Hood not latched.	No	Ensure hood is closed and latched.	If not OK: close hood.
	Autostart Reason - ECM Request	Engine Running	ECM tasks are currently running that will not allow an autostop.	No	Autostop will function once the task is complete.	Inform Customer - Normal Disable Condition.
	Autostart Reason - Low- Voltage Battery Discharge Current High	Engine Running	Excessive current draw is placing a high demand on the generator.	No	Check electrical loads, turn off unnecessary loads.	Inform Customer - Normal Disable Condition.
	Autostart Reason - Brake Pedal Released	Engine Running	Brake pedal not pressed (enough).	No	Ensure brake pedal is pressed sufficiently to active autostop.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Brake Booster Weak Vacuum	Engine Running	Weak brake booster vacuum.	No	Ensure brake booster vacuum is within normal operating values.	Check DTCs. Refer to brake booster diagnostics.
	Autostart Reason - Accelerator Pedal Pressed	Engine Running	Accelerator pedal pressed.	No	Ensure accelerator pedal is fully released.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - A/C Request	Engine Running	HVAC system is requesting AC compressor due to high cabin temperature	No	Allow cabin temperature/hu to reach setpoint, change setpoint, turn off blower.	Inform midiCtyustomer - Normal Disable Condition.
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	Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
			and/or humidity.
	Autostart Reason - Low- Voltage Battery Voltage Low	Engine Running	12V battery voltage is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostart Reason - Driver Exited Vehicle	Engine Running	Seat belt unbuckled and driver’s door opened.	No	Not in all vehicles. Verify seat belt and driver’s door switches.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Passenger Compartment Heater On	Engine Running	Passenger Compartment Heater On.	No	Check Vehicle DTCs.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Stop/Start select Switch	Engine Running	Stop/Start select Switch off.	No	Not in all vehicles.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Driver Exited Vehicle	Engine Running	Seat belt unbuckled and driver’s door opened.	No	Not in all vehicles. Verify seat belt and driver’s door switches.	If OK: Inform Customer - Normal Disable Condition.
	Autostart Reason - Low Voltage Battery State of Charge Low	Engine Running	12V battery voltage is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
	Autostart Reason - Inclination	Engine Running	Vehicle Grade indicates that an autostop was prevented (or an autostart was commanded) due to the	No	As Required.	If OK: Inform Customer - Normal Disable Condition.
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Scantool Parameter - Current Inhibit Reason	System State	Description	Expected Value	Recommended Check	Next Step
		current grade level of the vehicle.
Autostart Reason - Low Voltage Battery State of Function Low	Engine Running	12V battery voltage is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.
Autostart Reason - Remote Vehicle Start Request	Engine Running	Remote Start Requested.	No	As Required.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - Ignition Switch Start	Engine Running	Switch Start Request.	No	The driver can request an autostart in park or neutral by cranking the key. Autostops are not allowed again until out of park/neutral.	If OK: Inform Customer - Normal Disable Condition.
Autostart Reason - Low Voltage Battery State of Health Low	Engine Running	12V battery voltage is low.	No	Charge and test battery, operate vehicle for longer drives, check generator operation.	As Required.