Chassis, generic

C0002 TCS Control Channel A Valve 2

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0002 points to the second traction control valve of channel A. Together with valve 1 it forms the valve pair a TCS modulator adds to each brake circuit: an isolation valve that cuts the circuit off from the master cylinder and a priming valve that opens the path from the master cylinder to the return pump, so pressure can rise at a driven wheel while the pedal is released. The public record does not say which of the pair J2012 calls valve 2. The module flags an open or shorted coil, an implausible current or a pressure response that does not match the command. Traction and stability control are switched off and the ABS or ESC lamp comes on; foundation braking still works. No manufacturer documents this code publicly.

Likely causes

Solenoid coil open or shorted
Corroded or chafed wiring to the modulator
Internal hydraulic modulator fault

Symptoms

  • ABS warning lamp on
  • Traction and stability control disabled
  • Normal braking retained without ABS

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–1,600
Time1.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

tcs valve a2

Related codes

C0001C0003C0004

References: rosap.ntl.bts.gov, patents.google.com, en.wikipedia.org.