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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS SELF-DIAGNOSTICS - 6.5LDIAGNOSTIC TESTSDTC P0605: CONTROL MODULE PROGRAMMING READ ONLY MEMORY (ROM)DIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Diagnostic Procedures
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Procedures
- Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
- Check DTCs. If this DTC is set, go to next step. If this DTC is not set, go to step 5.
- Reprogram PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After reprogramming PCM, check for DTCs. If DTC resets, go to next step. If DTC does not reset, go to step 6.
- Ensure that all tool connections are secure. Ensure programming equipment is operating correctly and correct software/calibration package is used. Attempt to program PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. Recheck DTCs. If DTC resets, go to next step. If DTC does not reset, go to step 6.
- Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After repairs, go to next step.
- Turn ignition on, with engine off. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. Operate vehicle within FREEZE FRAME conditions. 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, go to step 2.
- Using scan tool, check for DTCs. If any undiagnosed DTCs are set, perform appropriate DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, system is okay.
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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.