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 MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2107 (ENGINE CONTROLS AND FUEL - HYBRID (LZ1) - DTC P0351 THROUGH DTC P3449 AND TROUBLESHOOTING)DIAGNOSTIC INFORMATION AND PROCEDURESINSPECTION/MAINTENANCE SYSTEM CHECKCONDITIONS FOR CLEARING I/M TEST DTCS
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A
Conditions for Clearing I/M Test DTCs
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Conditions for Clearing I/M Test DTCs
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Only the OBD II System can erase the I/M Test DTC. The OBD II system must determine that the malfunction that caused the I/M Test DTC to be stored is no longer present and is not commanding the MIL. Each of the following represents ways to clear an I/M Test DTC:
- If the MIL goes out due to 3 passing drive cycles, scan tool code clear is not used, the I/M Test DTC is erased at power down of the last drive cycle.
- If a scan tool code clear is used to turn OFF the MIL, the I/M Test DTC is not erased, the DTC must PASS and not FAIL. The I/M Test DTC is erased at power down of the drive cycle.
- If the controller is reflashed/reprogrammed, all I/M Test DTCs are erased.
- For the OBD II System to run a single drive cycle for clearing an I/M Test DTC, all of the following conditions must occur:
- Cumulative time of engine run time is greater than 600 s.
- Cumulative vehicle operation above 41 kPa (25 mph) for over 300 s.
- Continuous vehicle idle for greater than 30 s.
- Turn ignition OFF for 5 s and allow the code to clear.
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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.