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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P157A or P16D7-P16D9 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P16D7, P16D8, P16D9 is not set.
    • If any of the DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If none of the DTCs are set 
  3. Verify DTC P157A is not set.
    • If the DTC is set 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the DTC is not set 
  4. Perform the scan tool control function: Sensor Supply Voltage - On

    Verify the scan tool parameter:

    • Sensor Supply Voltage Control Circuit High Test Status = Not Run or Okay
    • Sensor Supply Voltage Control Circuit Low Test Status = Not Run or Okay
    • Sensor Supply Voltage Control Circuit Open Test Status = Not Run or Okay
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector(s): K20 Engine Control Module
    • Wiggle the harness and connector(s): X50A Engine Wiring Harness Junction Block
    • If not the specified state 

      Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)

    • Go to next step: If the specified state 
  5. 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 

      Repeat the procedure starting at step 1

    • Go to next step: If the DTC is not set 
  6. All OK.
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