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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 33 (ENGINE CONTROLS - TESTS W/CODES - 3.8L)SELF-DIAGNOSTIC SYSTEMENGINE CONTROLS - TESTS W/CODES - 3.8LOVERVIEW
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Engine Controls - Tests W/Codes - 3.8L: Overview
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Overview
WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLE CODE IDENTIFICATION
| Code | Probable Cause |
|---|---|
| CODE P0101 | Mass Air Flow (MAF) |
| CODE P0112 | IAT Sensor Circuit Low Input |
| CODE P0113 | IAT Sensor Circuit High Input |
| CODE P0117 | Coolant Temperature Sensor Temperature Low |
| CODE P0118 | Coolant Temperature Sensor Temperature High |
| CODE P0122 | Throttle Position Sensor Signal Low |
| CODE P0123 | TP Sensor Signal High |
| CODE P0131 | Heated Oxygen Sensor Low Signal Voltage (Lean) |
| CODE P0132 | Heated O2 Sensor High Signal Voltage (Rich) |
| CODE P0134 | Heated Oxygen Sensor Open Circuit |
| CODE P0171 | Fuel Trim Lean |
| CODE P0172 | Fuel Trim Rich Rich |
| CODE P0321 | Spark Reference Circuit |
| CODE P0325 | Knock Sensor Error |
| CODE P0341 | Cam/Crank Error |
| CODE P0342 | Cam Signal Circuit |
| CODE P0401 | EGR Flow Test Failure |
| CODES P0501/P0502 | VSS Circuit |
| CODE P0703 | TCC Brake Input Circuit |
| CODE P0705 | Gear Range Switch Circuit |
| CODE P0712 | Transaxle Temperature Sensor Signal Voltage Low |
| CODE P0713 | Transaxle Temperature Sensor Signal Voltage High |
| CODE P0740 | TCC Circuit |
| CODE P0755 | Shift Solenoid "B" Problem |
| CODE P1350 | IC Circuit |
| CODE P1361 | IC Circuit |
| CODE P1406 | EGR Valve Pintle Position (1 Of 2) |
| CODE P1406 | EGR Valve Pintle Position (2 Of 2) |
| CODE P1530 | A/C Head Pressure Switch |
| CODE P1558 | Cruise System Problem SPS Indicated Low |
| CODE P1561 | Cruise Vent Solenoid |
| CODE P1562 | Cruise Vacuum Solenoid |
| CODE P1565 | Cruise Servo Position |
| CODE P1567 | Cruise Switches Circuit |
| CODE P1568 | Cruise System Problem (SPS Indicated High) |
| CODE P1571 | Traction Control Desired Torque Out Of Range |
| CODE P1573 | Traction Control Loss Of ABS/TCS Serial Data |
| CODE P1599 | Cruise Power Management |
| CODE P1623 | PROM Error |
| CODE P1630 | System Voltage High/Low |
| CODE P1640 | QDM NO. 1 Circuit |
| CODE P1650 | QDM NO. 2 |
| CODE P1670 | QDM NO. 4 |
NOTE:
On models not using "P" series codes, Code 12 should always exist when DLC test terminal is grounded with key on and engine off, but it may not be indicated by all makes of scan tester.
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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.