OBD-II code · Chassis
C0870 Adaptive Cruise Control Brake Request Performance
A brake request from adaptive cruise control or AEB cannot be executed within the expected response time.
Is it safe to drive with C0870?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyBus communication latency
- PossibleHydraulic block slow to build pressure
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- ABS Control Module, Acc Radar Module, Communication Bus
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.