DTC C1256 EBCM/EBTCM Internal Malfunction. Buick Century 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 DTC 🢒 DTC C1256 EBCM/EBTCM Internal Malfunction

ABS Components
Antilock Brake System Schematics
Power Distribution Schematics
Power Distribution Schematics
Handling Electrostatic Discharge Sensitive Parts Notice

Circuit Description

This DTC identifies a malfunction within the EBCM/EBTCM. When the EBCM/EBTCM relay is activated (turned on), voltage is supplied to the valve solenoids and pump motor.

Conditions for Setting the DTC

DTC C1256 is set when an internal EBCM/EBTCM malfunction exists.

Action Taken When the DTC Sets

•	A malfunction DTC is stored.

•	ABS/ETS/TCS is not disabled.

•	ABS/ETS/TCS Indicators are not turned on.

Conditions for Clearing the DTC

•	Condition for DTC is no longer present and scan tool clear DTC function is used.

•	100 ignition cycles have passed with no DTCs detected.

Diagnostic Aids

Possible cause for DTC C1256 to set is an internal relay problem within the EBCM/EBTCM.

Step	Action	Value(s)	Yes	No
1	Was the Diagnostic System Check performed?	--	Go to Step 2	Go to Diagnostic System Check - ABS
2	Turn the ignition switch to the OFF position. Disconnect the EBCM/EBTCM harness connector. Check EBCM/EBTCM and harness connector for damaged, pushed out, or miswired terminals. Was any damage found?	--	Go to Step 3	Go to Step 4
3	Repair as necessary. Is the repair complete?	--	Go to Step 4	--
4	Reconnect all connectors. Using a scan tool clear the DTC. After clearing the code, test drive the vehicle while monitoring ABS data with a scan tool. Does DTC reset as a current DTC?	--	Go to Step 5	--
5	Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module/Electronic Brake and Track Control Module Replacement . Is the replacement complete?	--	Go to Diagnostic System Check - ABS	--