DTC C0271-C0273, C0284. GMC Truck Sonoma Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 4WD 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0271-C0273, C0284

This DTC identifies a malfunction within the electronic brake control module (EBCM).

The ignition is ON.

The EBCM detects an internal malfunction.

If equipped, the following actions may occur:

•	The EBCM disables the ABS/TCS/DRP.

•	The ABS indicator turns ON.

•	The TRACTION OFF indicator turns ON.

•	The red brake warning indicator turns ON.

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Replace the EBCM if DTC C0273 or DTC C0284 continues to set intermittently.

Step	Action	Yes	No
1	Did you perform the ABS Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - ABS
2	Is DTC C0271 or DTC C0272 set in the EBCM memory?	Go to Step 4	Go to Step 3
3	Use a scan tool in order to clear the DTCs. Turn OFF the ignition for 5 seconds. Turn ON the ignition. Does the DTC set?	Go to Step 4	Go to Diagnostic Aids
4	Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure and the Trim Level Calibration procedure, if applicable. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement?	Go to Step 5	--
5	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK