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 MANUALSMERCURY2009MOUNTAINEER 4.6 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P1260: - THEFT DETECTED, VEHICLE IMMOBILIZED
2009 Mercury Mountaineer 4.6 8, RWD
DTC P1260: - Theft Detected, Vehicle Immobilized
2009 Mercury Mountaineer 4.6 8, RWDSECTION DTC P1260: - Theft Detected, Vehicle Immobilized
DTC P1260: - THEFT DETECTED, VEHICLE IMMOBILIZED
| Description: | This DTC can be set if the passive anti-theft system (PATS) has determined a theft condition existed and the engine is disabled or an engine start was attempted using a non-PATS key. This DTC is a good indicator to check the PATS for DTCs. This DTC can also be set when a new instrument cluster (IC) or powertrain control module (PCM) is installed without correctly programming either module even if the vehicle is not equipped with PATS. |
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| Possible Causes: |
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| Diagnostic Aids: | Theft indicator flashing rapidly or on solid when the ignition is in the ON position. Check the anti-theft system for DTCs. Refer to the ANTI-THEFT - PERIMETER
, Diagnostic Trouble Code (DTC) Charts to continue diagnosis. If a new IC or PCM is installed without correctly programming either module, the parameters must be reset in both modules. Refer to the ANTI-THEFT - PERIMETER , Passive Anti-Theft System (PATS) Parameter Reset, to continue diagnosis. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test QD . | ||
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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.