Fault Family System: Chassis (C-Codes) 11 SAE Codes

Brake Booster Temperature Sensor Circuit

Diagnostic & Technical Explanation

Code C0579 (Brake Booster Temperature Sensor B Circuit Low) sets when the electric brake booster's internal temperature sensor for its drive motor reports a circuit that is open, shorted to power or ground, out of its calibrated range, or disagrees with a redundant temperature channel on the same motor. This sensor protects the booster motor windings from thermal damage during repeated hard braking, so the module will limit or disable electric assist when it cannot trust the reading. The sensor and its wiring are integral to the booster housing, making a failed thermistor element or an internal harness break the most common causes.

These 11 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 11 times.

Codes in this family (11)

Code	Definition	Repair coverage
C0579	Brake Booster Temperature Sensor B Circuit Low	4 ranked fixes
C057A	Brake Booster Temperature Sensor B Circuit High	4 ranked fixes
C057B	Brake Booster Temperature Sensor B Circuit/Open	4 ranked fixes
C057C	Brake Booster Temperature Sensor B CircuitRange/Performance	4 ranked fixes
C057D	Brake Booster Temperature Sensor Circuit B Intermittent/Erratic	4 ranked fixes
C057E	Brake Booster Temperature Sensor A/B Correlation	4 ranked fixes
C05B3	Brake Booster Temperature Sensor C Circuit Low	4 ranked fixes
C05B4	Brake Booster Temperature Sensor C Circuit High	4 ranked fixes
C05B5	Brake Booster Temperature Sensor C Circuit/Open	4 ranked fixes
C05B6	Brake Booster Temperature Sensor C Circuit Range/Performance	4 ranked fixes
C05B7	Brake Booster Temperature Sensor C Circuit Intermittent/Erratic	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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