C05B6
Brake Booster Temperature Sensor C Circuit Range/Performance
Brake booster temperature sensor C reading implausible. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Brake booster temperature sensor C reading implausible. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Common causes
- high
Sensor reading drifted
One of the most commonly reported causes for this code — check this first.
Typical part cost: $170-1320
- low
Sensor element aged beyond calibration window
Less common, but worth ruling out after the more likely causes.
Typical part cost: $170-1320
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for C05B6.
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 C05B6.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for C05B6.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does C05B6 mean?
C05B6 means "Brake Booster Temperature Sensor C Circuit Range/Performance". It is a generic OBD-II code that points to a fault in the chassis.
What are the most common causes of C05B6?
sensor reading drifted; sensor element aged beyond calibration window; sensor mounting loose - signal damping — 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 C05B6 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.