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Tahoe / Yukon Service Manual

DTC P149F, P208A-P208D, P214E, or P2C11

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5507259 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 P149F Reductant Pump Resistance Performance DTC P208A Reductant Pump Control Circuit DTC P208B Reductant Pump Performance DTC P208C Reductant Pump Control Circuit Low DTC P208D Reductant Pump Control Circuit High DTC P214E Reductant Pump Current Too High DTC P2C11 Reductant Pump Current Too Low Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control A P208C P208A, P214E * P208D —
Control B P208C P208A, P214E * P208D —
Control C P208C P208A, P214E * P208D —
Low Reference — P208A, P214E * — —
* Additional DTCs may set

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

Circuit Description
Control The output circuit varies between ground and 12 V.
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Circuit Description
Low Reference Grounded through the control module.

Conditions for Running the DTC P208A, P208C, P208D, P214E DTC P10F4, P20FF, U010E = Not set Ignition = On or Engine = Running Ignition and Start Switch Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met P149F, P208B, P2C11 DTC P10C9, P10CA, P10DA, P10DB, P14FA, P20FF, U010E, U2412, U2626 = Not set DTCs related to the following system/component = Not Set B194 Reductant Pressure Sensor No other DTCs related to the concerned component are set. Ignition = On or Engine = Running Ignition and Start Switch Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 63 s Conditions for Setting the DTC P149F Reductant Pump = Resistance Out Of Range P208A Control Circuit = Open P208B Reductant Pump Speed = Not within a calibrated range P208C Control Circuit = Short to Ground P208D Control Circuit = Short to Voltage P214E Control Circuit = High Current P2C11 Control Circuit = Low Current Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC 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, P10DA, P10DB, P14FA ,P204B, P204C, P204D, P204E, P20FF, U010E, U2412, U2626 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 does not set
  4. All OK. Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: A38 Reductant Pump and Sensor Assembly
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 14 & Ground ⇒ If 10 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 14 @ Component harness & Terminal 36 @ 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 10 Ω
  4. Disconnect the electrical connector: @ K115 Reductant Control Module
  5. Test for less than 2 Ω between the test points: Control circuit terminal 7 @ Component harness & Terminal 37 @ Control module harness Control circuit terminal 8 @ Component harness & Terminal 24 @ Control module harness Control circuit terminal 16 @ Component harness & Terminal 11 @ Control module harness ⇒ If greater than 2 Ω Repair the open/high resistance in the circuit: ⇓ If less than 2 Ω
  6. Test for infinite resistance between the test points: Control circuit terminal 7 @ Component harness & Ground Control circuit terminal 8 @ Component harness & Ground Control circuit terminal 16 @ Component harness & Ground ⇒ If less than infinite resistance Repair short to ground on the circuit. ⇓ If infinite resistance
  7. Ignition » On / Vehicle » In Service Mode
  8. Test for less than 1 V between the test points: Control circuit terminal 7 @ Component harness & Ground Control circuit terminal 8 @ Component harness & Ground Control circuit terminal 16 @ Component harness & Ground ⇒ If greater than 1 V Repair the short to voltage on the circuit: ⇓ If less than 1 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 ⇓ If the DTC is not set
  11. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Emission Reduction Fluid Tank Replacement — A38 Reductant Pump and Sensor Assembly Reductant Control Module Replacement — K115 Reductant Control Module For control module replacement, programming, and setup refer to: Control Module References Additional Procedures 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