OBD-II code · Powertrain (generic, extended)
P25A2 Brake System Control Module A Requested MIL Illumination
The primary brake system control module (ABS/ESC/iBooster) has requested the ECM to illuminate the MIL because of an emissions-relevant fault on its side — for example a regenerative braking fault on a hybrid that affects driveline torque flow. The original fault is in the brake module.
Is it safe to drive with P25A2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInternal fault in the brake module — read its DTCs
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–5 h
- Emissions test
- Likely to fail
- Parts involved
- Brake Control Module A
Related codes
- P25C9Brake System Control Module B Requested MIL Illumination
- P259FTurbocharger A Boost Control Position At High Limit
- P25A0Turbocharger B Boost Control Position At Low Limit
- P25A1Turbocharger B Boost Control Position At High Limit
- P25A3Engine Hood Open
- P25A4Fuel Mode Select Switch Circuit
- P25A5Fuel Mode Select Switch Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.