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 P1A03: GENERATOR MOTOR SHUTDOWN CIRCUIT
2010 Mercury Mariner Hybrid, AWD
DTC P1A03: Generator Motor Shutdown Circuit
2010 Mercury Mariner Hybrid, AWDSECTION DTC P1A03: Generator Motor Shutdown Circuit
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.
P1A03 - GENERATOR MOTOR SHUTDOWN CIRCUIT
| Description: | The transaxle control module (TCM) continuously monitors the generator motor shutdown (GMSDN) circuit and the controller area network (CAN) signal for a GMSDN request from the powertrain control module (PCM). This DTC sets when the PCM requests generator or traction motor shutdown through the CAN signal or if there is an GMSDN circuit concern. The generator and traction motor inverters will be disabled. | ||
| Possible Causes: |
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| Diagnostic Aids: | With the PCM and TCM connected and the ignition in ON position, check the GMSDN signal frequency. If the frequency is between 49 and 75 Hz DC, no circuit problem is indicated and PCM traction motor shutdown is requested. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST TE . | ||
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.