C0870
Adaptive Cruise Control Brake Request Performance
A brake request from adaptive cruise control or AEB cannot be executed within the expected response time.
A brake request from adaptive cruise control or AEB cannot be executed within the expected response time.
Common causes
- high
Bus communication latency
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-1760
- medium
Hydraulic block slow to build pressure
A plausible cause — test and verify before replacing parts.
Typical part cost: $220-1760
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for C0870.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for C0870.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for C0870.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does C0870 mean?
C0870 means "Adaptive Cruise Control Brake Request Performance". It is a generic OBD-II code that points to a fault in the chassis.
What are the most common causes of C0870?
bus communication latency; hydraulic block slow to build pressure — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full C0870 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.