C0121 04 (ESP - Electronic Stability Program)

C0121 04
Valve Relay Does Not Close





Fault symptom
ABS warning lamp on
Messages shown in SID.
Steering column lock not working.
On-board diagnosis
Type of diagnosis:
Continuous
Enable criteria:
Ignition ON.
Valve activated
Fault criteria:
When voltage on output is below 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)