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DTC codes / C05xx · Brakes, steering and suspension / C0574

C0574Brake Pressure Sensor C Circuit Range/Performance

The anti-lock brake system (ABS) module monitors the electrical signal from the brake pressure sensor on circuit C and has detected that the signal voltage or pressure reading falls outside the expected range or behaves erratically during a defined test period. This code does not mean the sensor has completely failed, but rather that its performance is inconsistent with the other pressure sensors or with the commanded brake pressure.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • The ABS warning light is illuminated on the dashboard, often accompanied by the traction control and stability control lights.
  • The driver may notice a reduction in brake assist or a firmer brake pedal feel, especially during hard braking.
  • In some vehicles, the cruise control or hill-start assist may become disabled as a safety precaution.
  • The ABS may activate unnecessarily at low speeds or during light braking, causing a pulsation in the brake pedal.
  • Often no symptoms besides the warning light, with normal braking performance in everyday driving.
  • A stored code may be the only indication, with no drivability complaints reported by the driver.

Common causes, most likely first

  1. A faulty brake pressure sensor on circuit C, causing erratic or out-of-range voltage output.
  2. Damaged or corroded wiring and connectors in the circuit C harness, leading to intermittent signal loss.
  3. A weak or failing ABS module, which may misinterpret sensor signals or have internal circuit faults.
  4. Low brake fluid level or air trapped in the hydraulic system, causing pressure readings to deviate from expected values.
  5. A restricted or leaking brake line or hose affecting pressure distribution and sensor readings.
  6. Electrical interference from aftermarket accessories or poor grounds, corrupting the sensor signal.

How to diagnose and fix it

  1. Verify the brake fluid level and inspect for leaks; top off or repair as needed before clearing the code.
  2. Perform a visual inspection of the circuit C wiring and connector at the brake pressure sensor and ABS module, looking for chafing, corrosion, or loose pins.
  3. Use a scan tool to read live data from all brake pressure sensors and compare readings while applying the brake pedal to identify which sensor is inconsistent.
  4. Check the sensor's reference voltage and ground circuits with a multimeter to rule out wiring faults before condemning the sensor.
  5. If the sensor signal is erratic but wiring is good, replace the brake pressure sensor on circuit C and clear the code.
  6. If the sensor and wiring test good, diagnose the ABS module for internal faults, including checking for software updates or performing a module reset.
  7. After repairs, perform a road test with the scan tool to confirm the code does not return and that all pressure sensors read within specification.

Before you replace the ABS module

  • A common misdiagnosis is to replace the ABS module when the real problem is a chafed wire in the circuit C harness near the brake master cylinder or strut tower.
  • Low brake fluid or air in the system can set this code because the pressure sensor readings become inconsistent with the expected pressure curve, so always check the hydraulic system first.
  • On some vehicles, a weak battery or charging system fault can cause the ABS module to log this code due to low voltage during the self-test, so check the battery and charging system before diving into sensor diagnostics.
  • The code can be set by a sensor that is mechanically sound but has a contaminated connector, so cleaning the terminals and applying dielectric grease often resolves the issue without parts replacement.
  • Aftermarket brake pressure sensors are known to have calibration issues that trigger this code, so insist on an OEM-quality sensor if replacement is necessary.

Can I keep driving with C0574?

The vehicle remains safe to drive under normal conditions because the base brake system is unaffected, but you should avoid hard braking or emergency maneuvers until the fault is repaired. If the brake pedal feels abnormal or the ABS activates unexpectedly, stop driving and have the system inspected immediately.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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