P0A1C: Drive Motor B Control Module

What it means

A fault is detected in the drive motor B control module. The code identifies the affected module; the specific fault and its cause depend on the vehicle.

How it works

Drive motor B's control module manages that motor's operation in the hybrid system. This code points specifically to a fault associated with the motor B module, which may come from the module itself, its connections, wiring, communication circuit, or an unstable 12-volt supply.

Common causes

Most likely first.

1. Fault in drive motor B control module
2. Loose or corroded module connections
3. Damaged wiring or communication circuit
4. Low or unstable 12-volt supply

Symptoms

• Hybrid system warning light
• Reduced power
• Vehicle may not enter electric drive

How to diagnose it

1. Record freeze-frame data and scan all hybrid modules for related codes, especially communication and 12-volt supply faults.
2. Check scan-tool communication and status for the drive motor B control module to determine whether it is responding.
3. Inspect the motor B module's accessible connectors and wiring for looseness, corrosion, or physical damage.
4. Check the module's 12-volt supply and ground, then test its communication wiring using the vehicle diagram and manufacturer's procedure.
5. If its power, ground, connections, and network are sound, use manufacturer diagnostic information to confirm whether the module has an internal fault.

Common fixes

• Secure loose motor B module connections and clean or replace corroded terminals.
• Repair damaged motor B module wiring or communication connections.
• Correct a confirmed low or unstable 12-volt supply or ground fault.
• Replace the drive motor B control module if its internal failure is confirmed.

Can I keep driving?

Reduced power or loss of electric drive may occur, so avoid relying on the vehicle for high-speed or long-distance travel until it is checked. If it will not enter READY or power drops sharply, stop safely and arrange assistance.