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.
Diagnostic Trouble Code Identification/Availability
The following table lists only those codes available for this engine, as well as their identifications.
The diagnostic trouble code charts are used to find and repair problems which the Diagnostic Circuit Check has found. If the Diagnostic Circuit Check shows that codes have been stored, proceed to the appropriate code chart. If more than one code has been stored, always start code diagnosis with the lowest code number and work upward.
These charts are not contained in this article. They can be found in the appropriate article in the ENGINE PERFORMANCE Section.
| Code | Identification |
|---|---|
| 13 | Oxygen Sensor Circuit (Open Circuit) |
| 14 | Coolant Temperature Sensor Circuit (High Temperature Indicated) |
| 15 | Coolant Temperature Sensor Circuit (Low Temperature Indicated) |
| 21 | Throttle Position Sensor (TPS) Circuit (Signal Voltage High) |
| 22 | Throttle Position Sensor (TPS) Circuit (Signal Voltage Low) |
| 23 | Manifold Air Temperature (MAT) Sensor Circuit (Low Temperature Indicated) |
| 24 | Vehicle Speed Sensor (VSS) Circuit |
| 25 | Manifold Air Temperature (MAT) Circuit (High Temperature Indicated) |
| 32 | Exhaust Gas Recirculation (EGR) Circuit |
| 33 | Mass Air Flow (MAF) Sensor Circuit (Grams/Second High) |
| 34 | Mass Air Flow (MAF) Sensor Circuit (Grams/Second High) |
| 41 | Cylinder Select Error (Faulty or Incorrect MEM-CAL) |
| 42 | Electronic Spark Timing (EST) Circuit |
| 44 | Oxygen Sensor Circuit (Lean Exhaust Indicated) |
| 45 | Oxygen Sensor Circuit (Rich Exhaust Indicated) |
| 51 | PROM Error (Faulty or Incorrect PROM) |
| 52 | CALPAK Error (Faulty or Incorrect CALPAK) |
| 53 | System Over Voltage |
| 54 | Fuel Pump Circuit (Low Voltage) |
| 55 | ECM Error |
NO RELATED
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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.