Fault Family System: Chassis (C-Codes) 5 SAE Codes

Brake Booster Pressure Travel Sensor Circuit

Diagnostic & Technical Explanation

Code C0047 (Brake Booster Pressure Sensor) sets when the module loses a valid signal from the sensor that reports how far the brake booster's output rod has traveled or how much boosted pressure it has produced -- the circuit is open, its power supply is missing, or the reported value stops tracking pedal input. This sensor lets the module blend booster assist with ABS and stability control pressure requests, so a fault here can cause an inconsistent pedal feel under combined braking events. A damaged sensor element, a corroded connector at the booster body, or a broken 5V supply wire are the usual physical causes.

These 5 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 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
C0047	Brake Booster Pressure Sensor	4 ranked fixes
C0048	Brake Booster Travel Sensor	4 ranked fixes
C056A	Brake Booster Pressure Sensor Power Supply Circuit	4 ranked fixes
C056F	Brake Booster Travel Sensor Circuit Low	4 ranked fixes
C0570	Brake Booster Travel Sensor Circuit High	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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