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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0641 or P06A6 (Chassis Control Module) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: Fuel Pressure = 345 to 650 kPa (50 to 94 PSI)
    • If not between 345 and 650 kPa (50 and 94 PSI) 

      Refer to: Circuit/System Testing

    • Go to next step: If between 345 and 650 kPa (50 and 94 PSI) 
  3. Increase/Decrease - Engine Speed/Throttle

    Verify the scan tool parameter: Fuel Pressure = 345 to 650 kPa (50 to 94 PSI) & Varies

    • If the value does not change 

      Refer to: Circuit/System Testing

    • Go to next step: If the value changes 
  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 

      Refer to: Circuit/System Testing

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