C0121 01 (TCS - Traction Control System)

C0121 01

Valve Relay Does Not Open







Fault symptom
- ABS warning lamp on
- Messages shown in SID.
- Steering column lock not working.

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Diagnostics run when ignition is ON.

Fault criteria:
- When voltage on output exceeds 2 V.

System reaction to a fault:
- No ABS function
- No TCS/ESP function

Diagnostic help

Diagnosis regards:
- Electrical fault in the component.

Functions in the diagnostic tool related to the fault:

Test value:
- Valve Feed

Activation:
- Valve Feed
(See also description of readings/activations in diagnostic tool)