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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 45 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.1L ENGINE)INSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE SYSTEM DTCSDESCRIPTION
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Inspection/Maintenance System DTCS: Description
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Description
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The following DTCs are required to set system status to YES:
Catalyst System
- P0420
TWC System Low Efficiency (Bank 1)
EGR System
- P0401
EGR System - P0404
EGR System - P0405
EGR Sensor Circuit - Low Voltage - P1404
EGR System (Valve No. 2)
EVAP System
- P0440
EVAP System - P0442
EVAP System - Leak Detected - P0446
EVAP Canister Vent Blocked - P1441
EVAP System Flow During Non-Purge
Oxygen Sensor System
- P0133
HO2S Slow Response - P0140
HO2S Circuit Insufficient Activity (Bank 1; Sensor 2) - P1133
HO2S Insufficient Switching (Bank 1; Sensor 1) - P1134
HO2S Transition Time Ratio (Bank 1; Sensor 1)
Oxygen Sensor Heater System
- P0135
HO2S Heater Performance - P0141
HO2S Heater Performance (Bank 1; Sensor 2)
Diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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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.