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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1380 (ENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS (HYBRID))DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSDTC P2535: IGNITION SWITCH RUN/START POSITION CIRCUIT HIGH
2010 Mercury Mariner Hybrid, AWD
DTC P2535: Ignition Switch Run/Start Position Circuit High
2010 Mercury Mariner Hybrid, AWDSECTION DTC P2535: Ignition Switch Run/Start Position Circuit High
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
P2535 - IGNITION SWITCH RUN/START POSITION CIRCUIT HIGH
| Description: | The powertrain control module (PCM) carries out a logic check on the ISP-R and ISPR/S circuits. If the ISP-R/S circuit stays high longer than a calibrated amount of time, or is high when the PCM when it is expected to be low, this DTC sets. | ||
| Possible Causes: |
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| Diagnostic Aids: | Monitor the KEYST parameter identifier (PID). The PID should indicate RUN when the ignition is in the ON position and RUN/START when the ignition is in the START position. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST B . | ||
RENDER: 1.0x
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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.