C1256 - FAULT CODE - OBD2

POST UPDATED IN October, 2021

C1256 Code failures by brands

C1256 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC, SATURN: EBCM INTERNAL MALFUNCTIONS

Description of DTC code C1256

Previously, cars used hydraulic braking systems without the supervision of any electrical system. However, manufacturers have developed various safety features for braking, including sensors and controllers. In these systems, each wheel has a speed sensor. A speed sensor is also installed for the transmission, and the valves have changed from hydraulic to electronic. All of them work together for the right operation of the brakes and traction control.

The EBCM (Electronic Brake Control Module) is installed in the engine compartment next to the brake fluid reservoir. The EBCM takes several sensor inputs and compares the current sensor status with the associated logic maps and reactions in its on-board memory.

When the DTC C1256 OBDII code is stored, it means that the Electronic Brake Control Module detects an internal malfunction.

Symptoms of fault code C1256

  • The Check Engine light turns on.
  • ABS warning light ON.
  • Troubles when activating ABS or Traction Control.

Causes of OBD2 C1256

The C1256 OBD2 fault code C1256 is stored because of the following reasons:

  • The Electronic Brake Control Module wiring may be in poor condition.
  • The Electronic Brake Control Module circuit connections may be faulty.
  • The EBCM may be defective.

Possible solutions of the DTC code C1256

To troubleshoot the C1256 OBDII diagnostic code, try this:

  • First, consult the TSBs.
  • Check with an automotive scanner to see if any additional DTCs are stored in addition to the C1256 that indicate problems with another module. If you discover such codes, perform their diagnosis according to the order obtained.
  • Check for damage to the EBCM circuit wiring and connections. Look for damage due to wear or burns. Repair if necessary.
  • Verify that the circuits related to the Electronic Brake Control Module are not open or shorted. If you discover one of these conditions, make the respective adjustments.
  • If you determine that the EBCM is damaged, we recommend that you go to an advanced automotive center, taking into account the complexity of this diagnosis.

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