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.
Trouble Code Identification
Check engine light will go on approximately 10 seconds after the ECM recognizes a problem. If malfunction clears, check engine light will go out and trouble code will be set in ECM. Code 53 will clear only after key is turned off. Code 12 does not store in memory.
If check engine light goes on intermittently, and does not store any codes after key is turned off and engine is restarted, see INTERMITTENT CHECK ENGINE LIGHT in TROUBLE SHOOTING section of this article.
| Code | Circuit Affected |
|---|---|
| 12 | No Engine RPM signal while cranking. |
| 14 | Low coolant sensor signal voltage. |
| 15 | High coolant sensor signal voltage. |
| 21 | Low MVS signal voltage. |
| 22 | High MVS signal voltage. |
| 24 | Low VSS signal. |
| 41 | No engine RPM signal (vehicle in motion). |
| 51 | Faulty PROM. |
| 53 | EGR control error. |
| 55 | Low "V-Ref." voltage. |
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.