DTC P27EB, P27ED, or P27EE

Automatic Transmission - 10L80 MHS MQC | Diagnostic Information and Procedures | Document ID: 5224840 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P27EB Transmission Range Control Valve Position Sensor Circuit DTC P27ED Transmission Range Control Valve Position Sensor Circuit Low DTC P27EE Transmission Range Control Valve Position Sensor Circuit High Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
9 V Reference	P27ED*	P27ED*	—	—
Signal	P27ED	P27ED	P27EE	—
* Additional DTCs may set

Typical Scan Tool Data Transmission Range Control Valve Position Sensor

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition = On Parameter Normal Range: 0.6 to 1.0 V — Default 1.7 to 2.2 V — Active
9 V Reference	0 V	0 V	0.6 to 1.0 V
Signal	0 V	0 V	4.9 to 5.0 V

Circuit/System Description Circuit Description 9 V Reference Regulated voltage supplied by the control module. g g pp y

Circuit	Description
Signal	The control module input circuit has an internal resistance connected to ground.

Component	Description
B315A Transmission Range Control Valve 1 Position Switch	A linear hall effect sensor that changes current flow based on the magnetic field’s position relative to the sensor.
K71 Transmission Control Module	The control module contains a microprocessor used to process input data to control outputs. The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.

The B315A Transmission Range Control Valve 1 Position Switch monitors the position of the Mode 1 Electronic Transmission Range Selector Valve Default = Low Voltage — 0.6 to 1.0 V Active = High Voltage — 1.7 to 2.2 V Conditions for Running the DTC Battery Voltage = Greater than 9 V Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s Conditions for Setting the DTC P27EB Transmission Range Control Valve 1 Position Switch = 1.26 to 1.50 V — For greater than 1 s P27ED Transmission Range Control Valve 1 Position Switch = Less than 0.41 V — For greater than 1 s P27EE Transmission Range Control Valve 1 Position Switch = Greater than 2.54 V — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC P27EB Autostart/Autostop = Disabled P27ED, P27EE Autostart/Autostop = Disabled Line Pressure Command = Default Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Automatic Transmission Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

Warning

Apply the parking brake and block the drive wheels before performing this procedure in order to prevent bodily injury.

1. Ignition » On / Vehicle » In Service Mode
2. Transmission Range » P
3. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 0.6 to 1.0 V ⇒ If not between 0.6 and 1.0 V Refer to: Circuit/System Testing ⇓ If between 0.6 and 1.0 V
4. Engine » Running
5. Transmission Range » D
6. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 1.7 to 2.2 V ⇒ If not between 1.7 and 2.2 V Refer to: Circuit/System Testing ⇓ If between 1.7 and 2.2 V
7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
8. All OK. Circuit/System Testing
9. Ignition/Vehicle » Off

Note

When the following connector is disconnected, the ignition cannot be turned off due to lack of a valid park input to the TCM. If the ignition needs to be turned off, the connector will need to be reconnected.

2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission
3. Ignition » On / Vehicle » In Service Mode
4. Test for 8.8 to 9.2 V between the test points: 9 V Reference circuit terminal 8 & Ground ⇒ If less than 8.8 V 4.1. Disconnect the electrical connector: K71 Transmission Control Module 4.2. Test for infinite resistance between the test points: 9 V Reference circuit terminal 8 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 4.3. Test for less than 2 Ω between the test points: 9 V Reference circuit terminal 8 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K71 Transmission Control Module ⇒ If greater than 9.2 V 4.1. Disconnect the electrical connector: K71 Transmission Control Module 4.2. Ignition » On / Vehicle » In Service Mode 4.3. Test for less than 1 V between the test points: 9 V Reference circuit terminal 8 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K71 Transmission Control Module ⇓ If between 8.8 and 9.2 V
5. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 10 kHz Duty Cycle » 40% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 20
6. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 2.0 to 2.3 V ⇒ If less than 2.0 V 6.1. Remove » EL-38522 Variable Signal Generator 6.2. Ignition/Vehicle » Off 6.3. Disconnect the electrical connector: K71 Transmission Control Module 6.4. Test for infinite resistance between the test points: Signal circuit terminal 20 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 6.5. Test for less than 2 Ω between the test points: Signal circuit terminal 20 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K71 Transmission Control Module ⇒ If greater than 2.3 V 6.1. Disconnect the electrical connector: K71 Transmission Control Module 6.2. Ignition » On / Vehicle » In Service Mode 6.3. Test for less than 1 V between the test points: Signal circuit terminal 20 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K71 Transmission Control Module ⇓ If between 2.0 and 2.3 V
7. Remove the component: Automatic Transmission Fluid Pan
8. Connect the electrical connector: X1 @ T12 Automatic Transmission
9. Disconnect the electrical connector: X176
10. Test for 8.8 to 9.2 V between the test points: 9 V Reference circuit terminal 11 @ Control module harness & Ground ⇒ If not between 8.8 and 9.2 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 8.8 and 9.2 V
11. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 10 kHz Duty Cycle » 40% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 10
12. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 2.0 to 2.3 V ⇒ If not between 2.0 and 2.3 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 2.0 and 2.3 V
13. Connect the electrical connector: X176
14. Disconnect the electrical connector: X177
15. Test for 8.8 to 9.2 V between the test points: 9 V Reference circuit terminal 6 @ Control module harness & Ground ⇒ If not between 8.8 and 9.2 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 8.8 and 9.2 V
16. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 10 kHz Duty Cycle » 40% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 5
17. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 2.0 to 2.3 V ⇒ If not between 2.0 and 2.3 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 2.0 and 2.3 V
18. Connect the electrical connector: X177
19. Disconnect the electrical connector: B315A Transmission Range Control Valve 1 Position Switch
20. Test for 8.8 to 9.2 V between the test points: 9 V Reference circuit terminal 1 @ Control module harness & Ground ⇒ If not between 8.8 and 9.2 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 8.8 and 9.2 V
21. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 10 kHz Duty Cycle » 40% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 1
22. Verify the scan tool parameter: Transmission Range Control Valve Position Sensor = 2.0 to 2.3 V ⇒ If not between 2.0 and 2.3 V Replace the appropriate component: Automatic Transmission Wiring Harness ⇓ If between 2.0 and 2.3 V
23. Test or replace the component: B315A Transmission Range Control Valve 1 Position Switch Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement Automatic Transmission Wiring Harness Replacement Control Valve Body Replacement — B315A Transmission Range Control Valve 1 Position Switch For control module replacement, programming, and setup refer to: Control Module References