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 P1429 (38): Motor Drive Module (MDM) Overheating Signal Circuit Problem: General Description
If the flag over temperature (FOT) signals from the power drive unit (PDU) do not vary from the low voltage level to the high voltage level within a set time after turning the ignition switch on, a malfunction is detected. The signals vary from a low voltage level to a high voltage level within a set time (t0) under normal conditions. If a problem occurs in the signal circuit, the signal stays at a low voltage level for a set time (t1) (t1>t0) after turning the ignition switch on, and the motor control module (MCM) detects a malfunction and stores a DTC.
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 2 seconds or more |
| DTC Type | One drive cycle, MIL ON, IMA system indicator ON |
| Condition | Minimum | Maximum |
|---|---|---|
| MCM power-supply voltage | 10.5 V | - |
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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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