C05B7 Brake Booster Temperature Sensor C Circuit Intermittent/Erratic

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.

Likely causes

Symptoms

• Brake system warning lamp flickers or appears only at times
• Code returns after clearing, often after rough roads or temperature changes

Repair estimate

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

Parts involved

Related codes

References: analogtechnologies.com, passive-components.eu, mitsubishitechinfo.com.