C05B3Brake Booster Temperature Sensor C Circuit Low
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- How the car detects it
- C05B3 means the third temperature channel of an electromechanical brake booster has dropped below its usable band. Mitsubishi documents the code for the Outlander PHEV: the DTC index pairs it with the brake unit's own code C18FC-18, EBA temperature sensor 1, and lights the brake system warning lamp plus the MIL after two trips. The value comes from the control electronics inside the electric intelligent brake unit. With the motor switch on, Mitsubishi stores the fault within one second if that reading is at or below −43 °C or at or above 169 °C. The fail-safe column says normal condition, so assist keeps working. Mitsubishi files its second sensor under C0579/C057A. Listed causes are harness, connector and the brake unit itself.
- What you may notice
- Brake system warning lamp on
- Check engine lamp on after two trips (Mitsubishi)
- Braking assist usually unchanged
- Likely causes
- LikelyFault in the temperature detection inside the electric brake unit's control module
- PossibleCorroded or loose brake unit connector or damaged harness
- RareSupply disturbance during start-up distorting the reading
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.