Chassis, generic

C0084 Traction Active Indicator

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Covers the traction-active indicator, the lamp that flashes to tell the driver traction control is currently intervening, as driven or monitored by the ABS/ESC module. The module flashes this lamp during a traction event and monitors the output circuit; this code is set when the indicator circuit is open or shorted, the lamp does not respond, or commanded and observed states disagree. It concerns the indicator path, not the traction function itself, so traction control may still operate while the driver loses its activity feedback. Traction-control patents describe the controller cutting torque and modulating brakes during intervention, which this lamp signals. 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

  • Traction indicator stuck on or off
  • No feedback during traction events
  • Failed lamp self-check

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–350
Time0.3–2 h

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

Parts involved

tcs active lamp

Related codes

C0085C0089C008A

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