OBD-II code · Network
U015A Lost Communication With Anti-Lock Brake System (ABS) Control Module B
ECU lost CAN communication with the secondary ABS control module B. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Is it safe to drive with U015A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- ABS Module B, Can Bus
Related codes
- U0157Lost Communication with Personalization Control Module
- U0158Lost Communication with Head Up Display
- U0159Lost Communication with Parking Assist Module
- U015BLost Communication With Power Steering Control Module B
- U015CLost Communication With Automated Driving System Control Module A
- U015DLost Communication With Automated Driving System Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.