Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2020EXPRESS 2500 LS, 2.8L ENG VIN 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 102 (ENGINE CONTROLS AND FUEL - 6.0L (L96 LC8) - DIAGNOSTIC INFORMATION AND PROCEDURES (1 OF 2))DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0231, P0232, OR P023F (CHASSIS CONTROL MODULE)CIRCUIT/SYSTEM VERIFICATION
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1
Circuit/System Verification
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1SECTION 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.
- Ignition - On / Vehicle - In Service Mode
- Perform the scan tool control function: Fuel Pump Enable Command @ Engine Control Module - On and Off
Verify the component turns On and Off: G12 Fuel Pump
- If the component does not turn On and Off
Refer to: Circuit/System Testing
- Go to next step: If the component turns On and Off
- If the component does not turn On and Off
- 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
- If the DTC sets
- All OK.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.