Chassis, generic

C0081 ABS Malfunction Indicator

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Covers the ABS malfunction indicator (warning lamp) itself as driven or monitored by the ABS/ESC module. The module commands the ABS lamp on for a fault and off when healthy, and monitors the output circuit; this code is set when the lamp circuit is open or shorted, the lamp does not respond, or the commanded and observed states disagree, for example a bulb-check failure or a bus message not reaching the cluster. It is about the indicator path rather than the ABS hydraulics, so braking and ABS themselves may still work while the driver loses the warning. The related rear-axle mismatch and wheel-speed codes describe the faults the lamp would normally announce. No code-specific public bulletin was confirmed; the entry follows the SAE J2012 generic definition and warning-lamp output monitoring.

Likely causes

Open or shorted indicator circuit
Lamp request not reaching the cluster
Failed indicator bulb or driver

Symptoms

  • ABS warning lamp stuck on or off
  • Failed lamp self-check
  • Driver loses ABS warning

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–400
Time0.3–2 h

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

Parts involved

wheel speed sensor rlwheel speed sensor rrtyres

Related codes

C0082C0086C0050

References: en.wikipedia.org, bosch-mobility.com.