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 MANUALSCHEVROLET2002C3500 HD 8.1 G, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - 8.1LDIAGNOSTIC INFORMATION AND PROCEDURESDTC P0230TEST DESCRIPTION
2002 Chevrolet C3500 HD 8.1 G, Automatic
Test Description
2002 Chevrolet C3500 HD 8.1 G, AutomaticSECTION Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2. Listen for a click when the fuel pump relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
- 4. This step verifies that the PCM is providing voltage to the fuel pump relay.
- 5. This step tests for an open in the ground circuit to the fuel pump relay.
- 6. This step tests if voltage is constantly being applied to the control circuit of the fuel pump relay.
RENDER: 1.0x
NO RELATED
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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.