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Tahoe / Yukon Service Manual

DTC P037E or P037F

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5501884 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 P037E Glow Plug Feedback Circuit Low DTC P037F Glow Plug Feedback Circuit High Circuit/System Description For an overview of the component/system, refer to: Glow Plug System Description The control module K20 controls the component: Glow Plugs Conditions for Running the DTC DTC P066A–P066F, P0671–P0674, P067A, P067B = Not set Glow Plugs = Enabled Ignition = On Ignition Voltage = 9 to 16 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC K20 Engine Control Module = Internal Malfunction — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Component View Reference Master Electrical Component List Electrical Information Reference Circuit Testing 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 P066A–P066F, P0671–P0676, or P067A–P067f 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 Replace the component: K20 Engine Control Module ⇓ If the DTC is not set
  4. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References