P0A1BDrive Motor A Control Module Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A1B flags a self-test failure of the processor that controls drive motor A, usually inside the inverter. In GM hybrid tables (2016) it sets when the processor fails an inhibit path test at power-down, three or more times, proving it could not take the system to a safe state; in 2011 tables internal SPI, RAM or cache faults in 28 of 32 samples count. Both are Type A, MIL on the first trip. Land Rover sets P0A1B in the inverter of 2024-25 PHEVs at start-up, VW lists P0A1B00 for the ID.4 front drive. Toyota uses subtype P0A1B-1F on the 2023-24 Corolla Hybrid. Drive motor B is P0A1C. Expect a red loss-of-drive warning.
- What you may notice
- Loss of drive warning and MIL
- Vehicle cannot be driven electrically or not at all
- Fault may vanish after a full sleep cycle while the code stays stored
- Likely causes
- LikelyControl software fault, several makers resolve it by reprogramming
- PossibleInternal processor or memory fault in the inverter control board
- RareWeak 12 V supply during start-up or shutdown
- 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: €100 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.