OBD-II code · Network
U023B Lost Communication With Image Processing Module B
ECU lost communication with image processing module B (camera ECU for ADAS, e.g. front camera). 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 U023B?
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
- Image Module B, Can Bus
Related codes
- U023ALost Communication With Image Processing Module A
- U023CLost Communication With Image Processing Module C
- U0238Lost Communication With Digital Audio Control Module D
- U0239Lost Communication With Entrapment Control Module A
- U023DLost Communication With Front Distance Range Sensor - Left
- U023ELost Communication With Front Distance Range Sensor - Right
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.