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.
2012 Lincoln Navigator 4WDFACTORY OEM SERVICE PROCEDURE
Starting System DTCS
PCM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| P0512 | Starter Request Circuit | This DTC indicates that the ignition switch START PCM input circuit has power while the ignition is in the OFF position. CARRY OUT the Ignition Switch Component Test. Refer to OEM COMPONENT TESTING for component testing. If necessary, INSTALL a new ignition switch. REFER to STEERING COLUMN SWITCHES . If the ignition switch passed the component test, REPAIR circuit CDC35 (BU/WH) for a short to power. |
| All other PCM DTCs | - | REFER to ELECTRONIC ENGINE CONTROLS |
Factory Service Tools
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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.
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