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 MANUALSCHEVROLET1996CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - G SERIES (6.5L DIESEL)DIAGNOSTIC TROUBLE CODESDTC P0602 - PCM NOT PROGRAMMEDDIAGNOSTIC PROCEDURES
1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 W
Diagnostic Procedures
1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 WSECTION Diagnostic Procedures
- Perform Powertrain On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
- Check all PCM connections. If a problem was found, go to step 4). If a problem was not found, go to next step.
- Check with manufacturer for latest software. If a problem was found, go to next step. If a problem was not found, go to step 5).
- Try to reprogram again. If programming is complete, go to step 6). If programming is not complete, go to next step.
- Replace PCM. Go to next step.
- Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0602. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
- Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.