P2E29 code meaning
Drive Motor A Excitation Current Sensor Circuit Low Voltage
Powertrain system Generic code P2Exx codes Check engine light
What P2E29 means
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.
P2E29 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E29
- Electric drive warning lamp on
- Loss of drive power from motor A
- Vehicle may not become ready to drive
Common causes of P2E29
- Most likelySensor signal line shorted to ground
- PossibleSensor supply or reference voltage missing
- PossibleExcitation current sensor or its isolated amplifier failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a excitation current sensorDrive motor a excitation circuitHybrid control module
What each part of P2E29 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 29 | The exact fault in that area. |
What to do next
- Note P2E29 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E29
What does P2E29 mean?
P2E29 means "Drive Motor A Excitation Current Sensor Circuit Low Voltage". P2E29 reports that the signal voltage of the excitation current sensor of drive motor A has dropped below the band the controller accepts. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E29?
Drive gently and only to a workshop. With P2E29 the car can go into limp mode (reduced power) to protect itself.
Will P2E29 fail an emissions test?
Yes, it can. P2E29 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2E29 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2E29 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.