DTC C1821: Brake Temperature Abnormal

DTC detecting condition: 

This code is recorded when the estimated value of temperature under braking is above certain threshold and therefore the conditions for control intervention are met.

Failure detection pattern: 

• "Primary" (high-priority diagnosis)

Warning light/indicator light: 

The combination of DTC and warning light display may differ from the list depending on vehicle conditions and driving conditions at the time of failure detection.

• ABS warning light -
• VDC warning light & VDC operation indicator light -
• Electronic parking brake warning light (red) -
• Brake warning light (EBD warning light) (red) -

1. CHECK DTC  .

   Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC C1821 a current code?

   Yes:  Stop the vehicle and turn off the engine until the DTC becomes a history code.

   No:  It results from a temporal increase in brake temperature. Check the brake pads, disc rotors, and brake fluid.