ABS and brakes

C0561 — ABS Disabled Due to System Malfunction

Severity: medium Drive with care, to a shop

What C0561 means

C0561 means the ABS control module found a fault in the system, such as a sensor, power supply, pump or an internal error, and deliberately disabled anti-lock and stability functions. Normally ABS uses wheel speed sensor signals to keep the wheels from locking under hard braking. Once disabled, the car brakes like a conventional system without that protection.

Symptoms

  • ABS and traction or stability control lights on
  • Longer stopping distance in a panic stop
  • Wheels locking on slippery surfaces
  • Stability and traction control not working
  • Possible unusual brake pedal feel

Possible causes

  1. Faulty wheel speed sensor or its wiring
  2. Low battery voltage or charging problem
  3. Internal ABS module failure
  4. ABS pump motor failure
  5. Corroded connectors, bad ground or blown fuse
  6. Damaged or dirty tone ring

How to diagnose

  1. Scan all modules, including ABS, and note any other stored codes
  2. Test battery voltage and alternator output (about 13.5-14.5 V running)
  3. Inspect ABS fuses and relays for the pump and valves
  4. Check wheel sensor and ABS module connectors and wiring for damage and corrosion
  5. Compare live wheel speed data from all four wheels while driving
  6. Inspect sensors and tone rings for debris, metal shavings, gap problems or damage
  7. Verify power and ground at the ABS module and pump motor
  8. Clear the code and see if it returns after a test drive

Common fixes

  • Charge or replace the battery and fix any charging fault
  • Replace the faulty wheel speed sensor or repair its wiring
  • Clean or replace corroded connectors and restore the ground
  • Replace the pump motor or hydraulic unit
  • Repair or replace the ABS module and program it

Questions and answers

What does C0561 mean?

The ABS module found an internal or sensor fault and turned off anti-lock and stability functions. The regular brakes still work, but without electronic assistance.

Can I drive with C0561?

Yes, carefully and only until it is repaired. Stopping distance may be longer on slippery roads and the wheels can lock.

Can a weak battery cause C0561?

Yes, low voltage often makes the ABS module shut down. Charge the battery, test the alternator, then clear the code and see if it comes back.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.