C1111 Code failures by brands


Description of DTC code C1111

The Anti-lock Braking System (ABS) is used to prevent the wheels from locking or losing traction during braking. It works in conjunction with the traditional braking system. The ABS has a built-in pump that is connected to the circuits that control the brake fluid and wheel revolutions. If after performing hard braking one of the wheels tends to slow down, which can result in a lock-up, the system will reduce the pressure on the brakes. Therefore, driver intervention will not be necessary.

The ABS pump creates a return of the brake fluid stored in the master cylinder reservoir. This action causes a decrease in the brake pressure. In turn, the motor activates the pump, taking into account the signals provided by the ABS Actuator and the Electrical Unit (Control Unit).

The DTC C1111 OBD2 is a code that signals a fault in the ABS Pump Motor. It is set when the engine shuts down during engine operation and the actuator is on. It is also set when the control line for the engine relay is open.

Symptoms of fault code C1111

Causes of OBD2 C1111

Reasons for storing the C1111 OBDII diagnostic code:

  • The Actuator wiring and ABS Electrical Unit may be damaged.
  • The electrical connections of the ABS Actuator circuit, the ABS Electrical Unit, or a fuse in the ABS Actuator circuit may be bad.
  • The Battery Power System may be deficient.
  • The ABS Actuator or ABS Electrical Unit could be faulty.

Possible solutions of the DTC code C1111

To troubleshoot the C1111 OBD2 fault code, try to do this:

  • First, consult the
  • Check the wiring related to the Actuator and the ABS Electrical Unit do not present common deficiencies due to burns or wear. If you detect any of these damages, make the appropriate repairs.
  • Measure the voltages of the ABS Actuator and the ABS Electrical Unit Compare these results to the manufacturer's specifications. If you discover deficiencies between the actual and stated voltages, check for bad connections or a blown fuse. Correct if necessary.

Codes related to C1111

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