P2E2BDrive Motor A Excitation Current Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E2B does not blame the sensor: the measured field current of drive motor A itself exceeds what the controller allows. In TI's example of an excitation stage, two switches and two diodes sit between the high-voltage rails; with both switches on, the rotor coil sees the entire DC-link voltage, and switches of this kind are rarely sized above about 50 A. A switch that sticks closed or a control loop that stops regulating therefore lets the current climb. Excess field current overheats the rotor coil, brushes and switches. The safe reaction TI describes is to command zero field current, which also removes rotor flux and back-EMF. No manufacturer documents P2E2B publicly. Sensor faults are P2E28 to P2E2A. The motor is usually shut down, so drive power from it is lost.
- What you may notice
- Electric drive warning lamp on
- Sudden loss of drive power from motor A
- Vehicle may not restart the drive system
- Likely causes
- LikelyExcitation power switch shorted or stuck on
- PossibleField current control or gate driver fault in the inverter
- RareShorted turns in the rotor field winding
- 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: €300 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.