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.
DTC U1204 (55): IMA-CAN Malfunction (Powertrain Control Module (PCM) - Motor Control Module (MCM)): General Description
The integrated motor assist-controller area network (IMA-CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (IMACANH and IMACANL). When the battery control processor in the motor control module (MCM) does not receive the signals from the powertrain control module (PCM) via the IMA-CAN lines for a set time, or the received data is abnormal for a specified cycle, a malfunction is detected and a DTC is stored.
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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.
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