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 231 (ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - (HYBRID))DTC DIAGNOSISDTC P0A1B: DRIVE MOTOR A CONTROL MODULE

2009 Mercury Milan Premier, 3.0 1, AWD

DTC P0A1B: Drive Motor A Control Module

2009 Mercury Milan Premier, 3.0 1, AWDSECTION DTC P0A1B: Drive Motor A Control Module

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

P0A1B - DRIVE MOTOR A CONTROL MODULE

Description:

This DTC indicates a drive motor A control module (MCM) internal malfunction.

Possible Causes:

MCM processor malfunction.
MCM A/D converter malfunction.
MCM supply voltage out of range.
TCM-MCM serial link malfunction.

Diagnostic Aids :

Application

Key On Engine Off

Key On Engine Running

Continuous Memory

All

See ⁽¹⁾

See ⁽²⁾

⁽¹⁾	Install a new transaxle. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) .

⁽²⁾	Clear the transaxle control module (TCM) continuous DTCs. Repeat the self-test. If DTC P0A1A is present again, install a new transaxle. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) .

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.