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 VARIANT/TRIMSECTION 20 (ENGINE COOLING SYSTEM - (EXCEPT HYBRID))DIAGNOSIS AND TESTINGENGINE COOLINGDTC CHARTPCM DTC CHART
2010 Mercury Mariner Hybrid, AWD
PCM DTC Chart
2010 Mercury Mariner Hybrid, AWDSECTION PCM DTC Chart
WARNING: This page is about a different variant/trim than selected.
PCM DTC CHART
| DTC | Description | Action |
|---|---|---|
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | GO to PINPOINT TEST C . |
| P0128 | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) | GO to PINPOINT TEST C . |
| P0217 | Engine Coolant Over Temperature Condition | GO to PINPOINT TEST B . |
| P0480 P0481 P0482 |
Fan Control (FC) Circuit 1, 2 or 3, respectively | REFER to the INTRODUCTION - GASOLINE MODELS . |
| P1285 | Cylinder Head Over Temperature Condition | GO to PINPOINT TEST B . |
| P1299 | Cylinder Head Over Temperature Protection Active | GO to PINPOINT TEST B . |
| All Other DTCs | - | REFER to the INTRODUCTION - GASOLINE MODELS . |
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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.