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 G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 557 (ENGINE CONTROLS - 3.4L (TROUBLESHOOTING & DIAGNOSIS))TROUBLESHOOTINGINSPECTION/MAINTENANCE (I/M) SYSTEM DTC TABLE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Inspection/Maintenance (I/M) System DTC Table
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Inspection/Maintenance (I/M) System DTC Table
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Not all vehicles will have every diagnostic trouble code (DTC) listed in each section. For example, a vehicle may have only 2 oxygen sensors or 1 catalyst. Only those DTCs applicable to the vehicle are required to update each System Status to YES. Refer to the appropriate service manual to determine which DTCs are supported for each vehicle.
Inspection/Maintenance (I/M) System DTC Table
| System | DTCs Required to Set System Status to YES |
|---|---|
| Catalyst | DTC P0420 Catalyst System Low Efficiency |
| EGR | DTC P0401
Exhaust Gas Recirculation (EGR) Flow Insufficient DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance DTC P0405 Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage DTC P1404 Exhaust Gas Recirculation (EGR) Closed Position Performance |
| EVAP | DTC P0442
Evaporative Emission (EVAP) System Small Leak Detected DTC P0446 Evaporative Emission (EVAP) Vent System Performance DTC P0455 Evaporative Emission (EVAP) System Large Leak Detected DTC P0496 Evaporative Emission (EVAP) System Flow During Non-Purge |
| Oxygen Sensor | DTC P0133
HO2S/O2S Slow Response Sensor 1 DTC P0140 HO2S Circuit Insufficient Activity Sensor 2 DTC P1133 HO2S Insufficient Switching Sensor 1 DTC P1134 HO2S Transition Time Ratio Sensor 1 DTC P0136 O2S Circuit Bank 1 Sensor 2 |
| Oxygen Sensor Heater | DTC P0135
HO2S Heater Performance Sensor 1 DTC P0141 HO2S Heater Performance Sensor 2 |
RENDER: 1.0x
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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.