C0001TCS Control Channel A Valve 1
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0001 concerns the first traction control valve of hydraulic channel A, usually one of the two brake circuits in the ABS/ESC modulator. To brake a spinning drive wheel without driver input, a TCS-capable modulator carries an extra isolation valve and priming valve per circuit: the normally open isolation valve closes off the master cylinder, while the normally closed priming valve opens so the pump can draw fluid and build pressure. Which of the two a maker numbers as valve 1 is not published. The module watches the coil circuit and whether pressure follows the command; a fault switches off traction and usually stability control and lights the warning lamp, while ordinary braking remains. 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.