OBD-II code · Network
U04BB Invalid Data Received From Switch Input Module B
A receiving module detected implausible data from switch input module B (multiplexed switch reader for steering/console buttons). Button state values fail plausibility checks and are rejected.
Is it safe to drive with U04BB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
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
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Switch Input Module B
Related codes
- U04BAInvalid Data Received From Switch Input Module A
- U04BCInvalid Data Received From Switch Input Module C
- U04B5Invalid Data Received From Brake System Control Module B
- U04B6Invalid Data Received From Catalyst Heater Control Module
- U04BDInvalid Data Received From Park Lock/Pawl Control Module
- U04BEInvalid Data Received From Battery Charger Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.