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 Codes
The ECM stores component failure information under a related trouble code which can be recalled for diagnosis and repair. When recalled, these codes will be displayed by flashes of the "CHECK ENGINE" lamp. Codes start with lowest numbered code. Only codes in which a related malfunction has occurred will be displayed.
| Code | Circuit Affected |
|---|---|
| 12 | Idle Position Switch - High Output |
| 13 | Idle Position Switch - Low Output |
| 14 | Wide Open Throttle Switch - High Output |
| 15 | Wide Open Throttle Switch - Low Output |
| 21 | Vacuum Control Solenoid - High Output |
| 22 | Vacuum Control Solenoid - Low Output |
| 23 | Incorrect Oxygen Sensor Reading |
| 24 | Incorrect Coolant Temperature Switch Reading |
| 25 | RAM Error |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.