Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

4: Use the scan tool in order to verify that the Brake Thermal Model is exceeded.

DTC C1238

Step	Action	Yes	No
Schematic Reference: ABS Schematics
1	Did you perform the ABS Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - ABS
2	Install a scan tool. Turn ON the ignition, with the engine OFF. Select the display DTCs function on the scan tool for the EBCM. Does the scan tool display that this DTC is set current?	Go to Step 4	Go to Step 3
3	Since most occurrences of this DTC are caused by excessive braking, review with the customer to verify the conditions under which the DTC set. Did vehicle operation cause this DTC to set?	Go to Diagnostic Aids	Go to Step 4
4	Allow 30 minutes from the last time you drove the vehicle for the cooling of the brake rotors. With a scan tool, observe the Brake Temp Status parameter in the ABS/TCS data list. Does the scan tool display Normal?	Go to Step 6	Go to Step 5
5	Inspect the alignment of the stop lamp switch. Refer to Stop Lamp Switch Adjustment in Lighting Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 6
6	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 as a current DTC?	Go to Step 7	System OK
7	Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair?	Go to Step 8	-
8	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