Chassis, generic

C0082 Brake System Malfunction Indicator

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Covers the brake system malfunction indicator (red brake warning lamp) as driven or monitored by the brake/stability module. The module commands this lamp for serious brake faults such as low fluid, pressure problems or a control fault, and monitors the output; this code is set when the lamp circuit is open or shorted, the lamp does not respond, or commanded and observed states disagree. It concerns the indicator path rather than the hydraulics, so the underlying brake function may still work while the driver loses an important warning, or the lamp stays on without a brake fault. Electronic brake-system designs route many warnings through this lamp, so it often appears with the brake fault it was meant to announce. No code-specific public bulletin was confirmed; the entry follows the SAE J2012 generic definition.

Likely causes

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

Symptoms

  • Red brake lamp stuck on or off
  • Failed lamp self-check
  • Driver loses brake 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

brake warning lamp

Related codes

C0081C0049C0072

References: en.wikipedia.org, patents.google.com.