For 1990-2009 cars

### Circuit Description

This DTC identifies a malfunction within the EBCM/EBTCM.

### Conditions for Setting the DTC

An internal EBCM/EBTCM malfunction exists.

### Action Taken When the DTC Sets

If equipped, the following actions occur:

• | A malfunction DTC is stored.

• | The ABS/TCS is disabled.

• | The ABS indicator turns ON.

• | The TRACTION OFF indicator turns ON.

• | For some DTC C1255xx, the variable effort steering is disabled.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present and you used the scan tool Clear DTC function.

• | The EBCM/EBTCM does not detect the DTC in 50 drive cycles.

### Diagnostic Aids

• | When the scan tool displays the DTC, 2 more numbers follow the DTC. Note the 2 numbers and any other DTCs. The 2 numbers with the DTC are an engineering aid in order to determine the cause of the internal malfunction.

• | A DTC C1255e2 can be caused by a battery or module connector disconnect. Inspect for a recent battery disconnect or module connector disconnect before replacing the EBCM/EBTCM.

• | A DTC C1255m5 can be set along with any wheel speed sensor DTC. Diagnose any wheel speed sensor DTCs before replacing the EBCM/EBTCM.

• | Make sure the integrity of the connection between the EBCM/EBTCM and the BPMV is secure, tight, and free from corrosion.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step checks for damage.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 | Are there any other DTCs present besides C1255xx? | -- | Go to Diagnostic Trouble Code (DTC) List | Go to Step 3
3 |

1. Turn OFF the ignition.
2. Disconnect the EBCM/EBTCM.
3. Inspect for damaged, pushed out, or miswired terminals.

Did you find any damage?

--

Go to Step 4

Go to Step 5

4 | Repair the EBCM/EBTCM as needed. Refer to Wiring Repairs in Wiring Systems or Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check - ABS | --
5 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check - ABS | --