Network
generic / SAE
U04B4
Invalid Data Received From Brake Blending Actuator
A receiving module detected implausible data from the brake blending actuator (manages mix of regen + friction braking on hybrids/EVs). Pressure command vs. actual fails plausibility checks and is rejected.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / B4
Possible causes
- Module internal fault or sensor input drift high
- Software version mismatch after replacement medium
- Gateway module routing CAN messages incorrectly low
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: 400–3000 €
- Estimated time: 1–5 h
- Component: brake blending actuator
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012