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 MANUALSLINCOLN2009NAVIGATOR 4WDREPAIR AND DIAGNOSISQUICK LOOKUPSDTC INDEXANTI-THEFT SYSTEMS (PATS) DTCSPCM DTC CHART
2009 Lincoln Navigator 4WD
PCM DTC Chart
2009 Lincoln Navigator 4WDSECTION PCM DTC Chart
PCM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| P1260 | Theft Detected, Vehicle Immobilized | If there are any Passive Anti-Theft System (PATS) DTCs present in the Instrument Cluster (IC), ADDRESS them first. This DTC may also indicate a Controller Area Network (CAN) concern or a parameter reset concern. Make sure to verify if there are any communication concerns/DTCs with any modules. REFER to MODULE COMMUNICATIONS NETWORK article. If DTC P1260 is the only DTC present, there may be a parameter reset, power or ground concern with the PCM. REFER to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET . If necessary, CHECK the powers and grounds to the PCM. REFER to the SYSTEM WIRING DIAGRAMS article for Expedition, SYSTEM WIRING DIAGRAMS article for Expedition EL, SYSTEM WIRING DIAGRAMS article for Navigator or SYSTEM WIRING DIAGRAMS article for Navigator L . |
| P1602 | Immobilizer/ ECM Communication Error |
NOTE:
If IC
DTC U2510 is also present, address IC
DTC U2510 first. Go To PINPOINT TEST G
. |
| P1622 | Immobilizer ID Does Not Match | CARRY OUT a parameter reset of the IC and the PCM and CYCLE the ignition 3-5 times, making an attempt to start the vehicle each key cycle. REFER to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. |
| All other DTCs | - | REFER to the INTRODUCTION - GASOLINE MODELS article. |
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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.