C05BB

Code

Generic C — Chassis

Brake Booster Motor A Position Sensor Supply Circuit Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 27 EN: 36 RU: 26

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Read freeze frame and live data from brake/ABS module for battery voltage and sensor values
Confirm battery voltage is within normal range (engine off and running)
Visually inspect connectors and wiring at the position sensor and module for damage, corrosion, or loose pins
Perform a wiggle test on the harness while monitoring live sensor output for intermittent changes
Check for related codes (ABS, traction, CAN bus, battery/charging) that could indicate a system-level issue

Sensor supply/reference: typically 5.0 V ±0.25 V from module (verify exact value for vehicle)
Signal output: expected approximate range 0.5 V to 4.5 V proportional to booster motor position (may vary by design)
Signal should be stable with smooth change when actuator moves; no abrupt drops to 0 V or full supply
Ground continuity: near 0 Ω to module ground (check for high resistance)
CAN/serial telemetry: position value should change logically with actuator movement if sensor reports digitally

Retrieve and record all related DTCs and freeze-frame data from the brake/ABS module.
Check and record battery/resting and running voltage. Charge or repair charging system if voltage is low or unstable.
Visually inspect the position sensor connector, harness and module connector for corrosion, bent pins, water intrusion, or damage. Repair as needed.
With connector connected, backprobe the sensor supply, signal and ground pins. Verify 5 V reference (or vehicle-specific reference), a stable signal and good ground.
If supply is absent or out-of-range, trace wiring back to the module. Check for shorts to battery or ground and for high-resistance joints or corrosion.
Wiggle the harness and move the booster/motor actuator with an assistant while monitoring live signal for intermittent faults.
If supply and ground are good but signal is out-of-range or not changing, disconnect sensor and measure sensor resistance (if passive) or verify correct output with an oscilloscope. Compare to manufacturer spec.
Check module outputs and driver circuitry for proper operation. If suspect, test for shorts at module and consider swapping or bench-testing the module where applicable.
Repair wiring or replace the position sensor if internal sensor fault is confirmed. Replace/repair connectors as necessary.
Clear codes, perform a functional test (power-up and actuator movement) and road test to confirm repair. Re-scan to verify no reoccurrence.