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 257 (ENGINE COOLING SYSTEM)DIAGNOSIS AND TESTINGENGINE COOLINGPOWERTRAIN CONTROL MODULE (PCM) DTC CHART
2010 Mercury Mariner Hybrid, AWD
Powertrain Control Module (PCM) DTC Chart
2010 Mercury Mariner Hybrid, AWDSECTION Powertrain Control Module (PCM) DTC Chart
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
POWERTRAIN CONTROL MODULE (PCM) DTC CHART
| DTC | Description | Action |
|---|---|---|
| P0217 | Engine Coolant (ECT) Over Temperature Condition | GO to PINPOINT TEST B . |
| P1285 | Cylinder Head Over Temperature (CHT) Condition | GO to PINPOINT TEST B . |
| P1299 | Cylinder Head Over Temperature (CHT) Protection Active | GO to PINPOINT TEST B . |
| P0125 | Insufficient Coolant Temperature (ECT) For Closed Loop Fuel Control | GO to PINPOINT TEST C . |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) | GO to PINPOINT TEST C . |
| P0480 P0481 P0482 |
Fan Control (FC) Circuit 1, 2 or 3, respectively | REFER to the INTRODUCTION - GASOLINE article. |
| All Other DTCs | - | REFER to the INTRODUCTION - GASOLINE 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.