C0004TCS Control Channel B Valve 2
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0004 completes the set with the second traction control valve of channel B. During an intervention the module closes the isolation valve and opens the priming valve of the circuit concerned so the pump can supply pressure to a wheel that is spinning; afterwards both return to rest so the driver's pedal again acts through the master cylinder. A valve that sticks or a coil that fails can therefore leave the pump without supply or keep the circuit isolated from the pedal, which is why the module reacts at once. It sets the code for an electrical fault or an implausible pressure response, switches off traction and stability control and lights the warning lamp. Base braking stays available. No manufacturer documents this code publicly.
- What you may notice
- ABS warning lamp on
- Traction and stability control disabled
- Normal braking retained without ABS
- Likely causes
- LikelySolenoid coil open or shorted
- PossibleCorroded or chafed wiring to the modulator
- RareInternal hydraulic modulator fault
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.