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 P1437 (41): Motor Drive Module (MDM) Short Circuit Sensor Problem: General Description
If a short circuit occurs in the three-phase coil of the integrated motor assist (IMA) motor when driving, the motor drive module (MDM) stops functioning and changes the flag short circuit (FSC) signals from a high level to a low level to protect itself. If the FSC signals stay at a low voltage level for a set time (t1), the motor control module (MCM) detects a malfunction and stores a DTC.
| Execution | Once per driving cycle |
| Sequence | Motor current U/V/W phase signal circuit, Battery module, Battery cell, IMA system, Bypass contactor, Motor commutation sensor, Battery cell temperature signal circuit, Detection signal circuit, Battery current circuit, Motor current signal circuit, MPI, MDM, BCM, MCM |
| Duration | 0.6 seconds or more |
| DTC Type | One drive cycle, MIL ON, IMA system indicator ON |
| Condition | Minimum | Maximum |
|---|---|---|
| MCM power-supply voltage | 10.5 V | - |
| No active DTCs | MCM | |
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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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