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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> 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 P157A is not set and no other DTCs are set.
    • If DTC P157A is not set and other DTCs are set 

      Refer to : Circuit/System Testing - Test 1

    • If DTC P157A is set and other DTCs are set 

      Refer to : Circuit/System Testing - Test 1

    • If DTC P157A is set and no other DTCs are set 

      Refer to : Circuit/System Testing - Test 2

    • Go to next step : If no DTC is set 
  3. Perform the scan tool control function : Sensor Supply Voltage Relay - On and Off

    Verify a click can be heard or felt at the component when the scan tool control function was commanded : KR121A Reductant Control Module Relay 1 & KR121B Reductant Control Module Relay 2

    • If a click cannot be heard or felt 

      Refer to : Circuit/System Testing - Test 1

    • Go to next step : If a click can be heard or felt 
  4. 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 step 2

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