DTC P10C9, P10CA, or P204B-P204E

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5501443 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 P10C9 Reductant Control Module Sensor Reference 2 Circuit Low DTC P10CA Reductant Control Module Sensor Reference 2 Circuit High DTC P204B Reductant Pressure Sensor Performance DTC P204C Reductant Pressure Sensor Circuit Low DTC P204D Reductant Pressure Sensor Circuit High DTC P204E Reductant Pressure Sensor Circuit Erratic Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
5 V Reference	P10C9	P10C9	P10CA	P204B
Signal	P204C, P204D	P204B, P204D	P204B, P204D	P204B
Low Reference	—	P204B, P204D	—	P204B

Circuit/System Description For an overview of the component/system, refer to: Exhaust Aftertreatment System Description

Circuit	Description
5 V Reference	Regulated voltage supplied by the control module.
Signal	The control module input circuit has an internal resistance connected to 5 V.
Low Reference	Grounded through the control module.

Component	Description
B194 Reductant Pressure Sensor	B194 is part of the component: A38 Reductant Pump and Sensor Assembly The sensor is a capacitive pressure transducer. Electronics in the sensor convert pressure into an analog voltage signal.
K115 Reductant Control Module	The control module controls the heating and dosing of the reductant.

Conditions for Running the DTC P10C9, P10CA, P204B-P204E DTC P10F4, P20FF = Not set { P204B } DTC P204C, P204D, P204E = Not set Ignition = On Ignition and Start Switch Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P10C9 5 V Reference circuit = Short to Ground P10CA 5 V Reference circuit = Short to Voltage P204B, P204E Reductant Pressure = Not within a calibrated range — For greater than 6 s P204C Signal circuit = Short to Ground P204D Signal circuit = Short to Voltage Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC — Additional actions taken: Reductant Injector = Disabled Reductant Tank Heaters = Disabled Reductant Pump = Disabled Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Engine 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

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P10C9, P10CA, P204B, P204C, P204D, P204E is not set. ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
3. 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
4. All OK. Circuit/System Testing

Note

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: A38 Reductant Pump and Sensor Assembly
3. Test for less than 20 Ω between the test points: Low Reference circuit terminal 3 & Ground ⇒ If 20 Ω or greater 3.1. Disconnect the electrical connector: K115 Reductant Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 3 @ Component harness & Terminal 21 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K115 Reductant Control Module ⇓ If less than 20 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.6 to 5.4 V between the test points: 5 V Reference circuit terminal 5 & Ground ⇒ If less than 4.6 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K115 Reductant Control Module 5.3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 5 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.4. Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 5 @ Component harness & Terminal 19 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K115 Reductant Control Module ⇒ If greater than 5.4 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K115 Reductant Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 5 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K115 Reductant Control Module ⇓ If between 4.6 and 5.4 V
6. Test for greater than 10 Ω between the test points: Signal circuit terminal 4 & Ground ⇒ If 10 Ω or less » Repair short to ground on the circuit. ⇓ If greater than 10 Ω
7. Test for less than 1 V between the test points: Signal circuit terminal 4 & Low Reference circuit terminal 3 ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V
8. Test for 4.6 to 5.4 V between the test points: Signal circuit terminal 4 & 5 V Reference circuit terminal 5 ⇒ If less than 4.6 V 8.1. Ignition/Vehicle » Off 8.2. Disconnect the electrical connector: K115 Reductant Control Module 8.3. Test for less than 2 kΩ between the test points: Signal circuit terminal 4 @ Component harness & Terminal 20 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K115 Reductant Control Module ⇓ If between 4.6 and 5.4 V
9. Replace the component: A38 Reductant Pump and Sensor Assembly
10. 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 Replace the component: K115 Reductant Control Module
11. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Reductant Control Module Replacement — K115 Reductant Control Module Emission Reduction Fluid Tank Replacement — A38 Reductant Pump and Sensor Assembly For control module replacement, programming, and setup refer to: Control Module References Additional Procedures

Note

Performing this procedure will clear the Driver Information message for the applicable system. Perform the scan tool control function: Reductant System Tamper Service Bay Test — Perform only when the following warning message is displayed: Service Emission System / Service Exhaust Fluid System