Network
generic / SAE
U02B4
Lost Communication With Front Radar Module A
The vehicle bus reports loss of communication with front radar module A. Adaptive cruise control, automatic emergency braking and forward collision warning lose their primary range/closing-speed input.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / B4
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 1–4 h
- Component: front radar module a
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012