What it means
The control module checks whether brake pressure sensor C has its required calibration data. It sets this code when the calibration is missing.
At a glance
- Usually lights the ABS or stability-control warning light
How it works
The brake control system needs calibration data for pressure sensor C to interpret its pressure signal correctly. C059C sets when that sensor’s required calibration is missing, for example after sensor or module service, or when the calibration did not complete.
Common causes
Most likely first.
- Calibration not performed after sensor or module service
- Calibration procedure incomplete
- Module configuration issue
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Scan the brake and stability-control modules, save fault details, and check for pressure-sensor or communication codes that may prevent calibration.
- Review recent brake sensor or module work and verify that the correct sensor C calibration procedure applies to the vehicle.
- Inspect sensor C’s connector and wiring for damage or poor contact, and check module power and communication status.
- Use a capable scan tool to check sensor C calibration status and perform the manufacturer-specified calibration with the required conditions met.
- Rescan and confirm the calibration is stored and that pressure readings are plausible according to vehicle service information.
Common fixes
- Complete the required calibration for brake pressure sensor C using a compatible scan tool.
- Repeat the calibration after repairing any wiring or communication fault that prevented completion.
- Correct module configuration or software if service information identifies it as the cause.
- Replace sensor C only if testing finds a sensor fault rather than missing calibration alone.
Can I keep driving?
ABS or stability functions may be limited while the brake pressure signal is not correctly calibrated. Have the calibration completed before relying on those functions, and stop driving if braking response is abnormal.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.