C05B7Brake Booster Temperature Sensor C Circuit Intermittent/Erratic
- Generic OBD-II code · Chassis
- Needs a drive cycle to confirm a fix
- How the car detects it
- C05B7 is meant for a temperature C signal that jumps or briefly drops out rather than failing permanently. No manufacturer documents it publicly. In Mitsubishi's Outlander PHEV the sensor C channel is judged against fixed limits with a detection time of up to one second, so short spikes there end up as C05B3 or C05B4 instead of a separate erratic code. Thermistor specialists attribute unstable readings mainly to mechanical stress: bent leads, board flex or shocks can produce intermittent contact before the part opens completely, and damaged coatings let moisture in. Because the sensor often sits on the booster's own board, a cracked solder joint is the usual suspect. The lamp may come and go with temperature or rough roads, and the fault tends to reappear after clearing.
- What you may notice
- Brake system warning lamp flickers or appears only at times
- Code returns after clearing, often after rough roads or temperature changes
- Likely causes
- LikelyCracked solder joint or lead at the thermistor
- PossibleLoose pin or fretting corrosion at the booster connector
- RareMoisture reaching the sensing element through a damaged coating
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.