P2E29Drive Motor A Excitation Current Sensor Circuit Low Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E29 reports that the signal voltage of the excitation current sensor of drive motor A has dropped below the band the controller accepts. The sensor sits in the excitation stage that feeds direct current to the rotor field coil of an electrically excited motor; TI names shunts with isolated amplifiers or isolated Hall-effect sensors for this job. A reading pinned low is an electrical fault: a short to ground, a lost sensor supply or reference, or a dead sensor. No manufacturer documents P2E29 publicly. Implausible but valid readings are P2E28, a high signal P2E2A, the general circuit fault P2E7B. Because the field current can no longer be measured, the controller will likely switch the field off, as TI recommends for faults, and drive torque from this motor is lost.
- What you may notice
- Electric drive warning lamp on
- Loss of drive power from motor A
- Vehicle may not become ready to drive
- Likely causes
- LikelySensor signal line shorted to ground
- PossibleSensor supply or reference voltage missing
- PossibleExcitation current sensor or its isolated amplifier failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.