C0570

Code

Generic C — Chassis

Brake Booster Travel Sensor Circuit High

Brand: Generic

Type: C — Chassis

Views: UK: 29 EN: 54 RU: 27

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Open or shorted wiring (short to battery/ignition voltage) on the booster travel sensor circuit
Corroded/damaged connector pins at the sensor or control module
Faulty brake booster travel/position sensor (potentiometer or Hall-effect)
Poor or missing ground or reference voltage to the sensor
Faulty ABS/BRK control module or input circuit
Mechanical damage to the booster sensor or extreme sensor travel beyond range

ABS or brake-related warning lamp illuminated (ABS, BRAKE, or traction control lamp)
Possible reduced ABS or brake assist functionality depending on vehicle
Brake feel may be unusual if booster or travel sensor is mechanically affected
Faults stored intermittently if wiring is intermittent

Read freeze frame and freeze data with a scan tool and note conditions when DTC set
Inspect sensor connector and wiring for corrosion, damage, pin push-out, or water intrusion
Visually inspect harness routing for chafing, pinched wires, or proximity to hot/exposed metal
Clear code and perform drive/actuation to reproduce while monitoring live data from the travel sensor
Check module connector pins for corrosion or bent pins at ABS/BRK control unit

Typical potentiometer-type sensor: ~0.5–4.5 V across travel (0 V or 4.5 V = high/out-of-range)
Hall-effect sensors may output a 0–5 V (or 0.5–4.5 V) analog level or a PWM/frequency signal—refer to vehicle-specific values
Expected resistance (potentiometer) will vary by design; compare to factory spec (often a few hundred ohms to several kilohms)
OL or > specified voltage on the signal line indicates short to battery or internal sensor failure

Obtain and record freeze frame data and clear the DTC. Attempt to re-create the fault while monitoring live sensor data.
Visually inspect the brake booster sensor connector and wiring harness for damage, corrosion, disconnected connectors, or fluid contamination.
Backprobe the sensor signal, reference (Vref), and ground with the ignition ON and compare to expected values: Vref (usually 5 V) present, ground continuity good, and signal within expected range (~0.5–4.5 V).
If signal reads very high (near battery voltage) check for a short to B+ on the signal wire — disconnect the sensor connector and measure the signal pin at the harness. If harness still reads high with sensor disconnected, suspect wiring short to B+ or module pull-up.
If signal disappears or is within range when sensor is disconnected, inspect the sensor for internal short to B+ and replace sensor if confirmed faulty.
Perform wiggle test on wiring from sensor to control module while monitoring live data to find intermittent opens/shorts.