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Home / DTC / C0570 — Brake Booster Travel Sensor Circuit High

C0570 — Brake Booster Travel Sensor Circuit High

Detailed page for trouble code C0570.

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C0570

Generic C — Chassis

Brake Booster Travel Sensor Circuit High

Brand: Generic
Type: C — Chassis
Views: UK: 19 EN: 33 RU: 20
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Page language: EN

Causes

  • 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

Symptoms

  • 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

What to check

  • 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

Signal parameters

  • 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

Diagnostic algorithm

  1. Obtain and record freeze frame data and clear the DTC. Attempt to re-create the fault while monitoring live sensor data.
  2. Visually inspect the brake booster sensor connector and wiring harness for damage, corrosion, disconnected connectors, or fluid contamination.
  3. 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).
  4. 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.
  5. 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.
  6. Perform wiggle test on wiring from sensor to control module while monitoring live data to find intermittent opens/shorts.

Likely causes

  • Short to battery/ignition voltage on the sensor signal wire
  • Faulty/contaminated sensor connector or pin corrosion
  • Failed brake booster travel sensor element (internal short or open)
  • Intermittent wiring break or damaged insulation

Fault status

⚠️ Status
Brake Booster Travel Sensor Circuit High — sensor signal above expected range (possible short to battery, sensor fault or wiring/connector issue).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

C0571 C0572 C0580 C0560
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