OBD-II code · Network
U0252 Lost Communication With Lighting Control Module Rear B
The vehicle bus reports loss of communication with the rear lighting control module B. Tail, brake, turn and reverse lamps controlled by this node may fall back to a default state or stay off.
Is it safe to drive with U0252?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Rear Lighting Module B, Vehicle Bus Wiring
Related codes
- U024FLost Communication With Side Obstacle Detection Control Module D
- U0250Lost Communication With Impact Classification System Module
- U0251Lost Communication With Running Board Control Module B
- U0253Lost Communication With Accessory Protocol Interface Module
- U0254Lost Communication With Remote Start Module
- U0255Lost Communication With Front Display Interface Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.