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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 650 (CLIMATE CONTROL SYSTEM-GENERAL INFORMATION AND DIAGNOSTICS)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMDIAGNOSTIC TROUBLE CODE INDEXELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE, DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) MODULE AND DIAGNOSTIC TROUBLE CODE (DTC) INDEX
2009 Mercury Milan Premier, 3.0 1, AWD
Electronic Automatic Temperature Control (EATC) Module, Dual Automatic Temperature Control (DATC) Module and Diagnostic Trouble Code (DTC) Index
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Electronic Automatic Temperature Control (EATC) Module, Dual Automatic Temperature Control (DATC) Module and Diagnostic Trouble Code (DTC) Index
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. REFER to the
INTRODUCTION - GASOLINE
article.
DIAGNOSTIC TROUBLE CODE INDEX
| DTC | Description | Action to Take |
|---|---|---|
| B1200 | Stuck Button | Button held too long may set DTC. ATTEMPT to clean buttons. If code returns, INSTALL a new DATC/EATC module. REFER to CLIMATE CONTROL . |
| B1251 | A/C In-Vehicle Temperature Sensor Open Circuit | GO to PINPOINT TEST A . |
| B1253 | A/C In-Vehicle Temperature Sensor Circuit Short to Ground | GO to PINPOINT TEST A . |
| B1255 | A/C Ambient Temperature Sensor Open Circuit | GO to PINPOINT TEST B . |
| B1257 | A/C Ambient Temperature Sensor Circuit Short to Ground | GO to PINPOINT TEST B . |
| B2427 | RH A/C Solar Radiation Sensor Circuit Short to Ground | GO to PINPOINT TEST C . |
| B2426 | RH A/C Solar Radiation Sensor Open Circuit | GO to PINPOINT TEST C . |
| B2795 | LH A/C Solar Radiation Sensor Circuit Short to Ground | GO to PINPOINT TEST C . |
| B2796 | LH A/C Solar Radiation Sensor Open Circuit | GO to PINPOINT TEST C . |
| B1003 | Mode Door Short/Failure | GO to PINPOINT TEST E . |
| B1676 | Battery Voltage Out of Range | GO to PINPOINT TEST F . |
| B2266 | LH Blend Door Failure or Short | GO to PINPOINT TEST K . |
| B2267 | RH Blend Door Failure or Short | GO to PINPOINT TEST K . |
| B2268 | Steering Wheel Control Switch Open Circuit | GO to PINPOINT TEST P . |
| B2269 | Steering Wheel Control Switch Circuit Short to Ground | GO to PINPOINT TEST P . |
| B1342 | EATC Module Faulted | INSTALL a new DATC/EATC module. REFER to CLIMATE CONTROL . |
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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.