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 P0A05: MOTOR ELECTRONICS COOLANT PUMP (MECP) CONTROL CIRCUIT OPEN
2010 Mercury Mariner Hybrid, AWD
DTC P0A05: Motor Electronics Coolant Pump (MECP) Control Circuit Open
2010 Mercury Mariner Hybrid, AWDSECTION DTC P0A05: Motor Electronics Coolant Pump (MECP) Control Circuit Open
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.
P0A05 - MOTOR ELECTRONICS COOLANT PUMP (MECP) CONTROL CIRCUIT OPEN
| Description: | The powertrain control module (PCM) monitors the MECP primary circuit output. The test fails if the PCM grounds the MECP circuit, and excessive current draw is detected on the MECP circuit; or, with the MECP circuit not grounded by the PCM, voltage is not detected on the MECP circuit. The PCM expects to detect VPWR voltage coming through the MECP relay coil to the MECP circuit. | ||
| Possible Causes: |
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| Diagnostic Aids: | When the MECP_F parameter identification (PID) displays YES, a concern is present. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST KT . | ||
RENDER: 1.0x
NO RELATED
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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.