Looks like an internal EBCM malfunction. Here is the flow chart:
DTC C0240-C0259
Circuit Description
The system relays are energized when the ignition is ON and the vehicle speed is greater than 6 km/h (4 mph). The system relay supplies voltage to the solenoid valves and to the pump motor. This voltage is referred to as the system voltage. The EBCM controls the solenoid valves by grounding the control circuit.
Conditions for Running the DTC
"Â The ignition is ON.
"Â The vehicle speed is greater than 6 km/h (4 mph).
Conditions for Setting the DTC
The EBCM detects an internal malfunction.
Action Taken When the DTC Sets
CC0240, C0249, C0250, C0255-C0259
If equipped, the following actions may occur:
"Â The EBCM disables the TCS/VSES.
"Â The traction off indicator turns ON.
"Â The message center displays the SERVICE STABILITY SYSTEM message.
C0241, C0242, C0245, C0246, C0251-C0254
If equipped, the following actions may occur:
"Â The EBCM disables the DRP/ABS/TCS/VSES.
"Â The ABS indicator turns ON.
"Â The brake warning indicator turns ON.
"Â The traction off indicator turns ON.
"Â The message center displays the SERVICE STABILITY SYSTEM message.
C0243, C0244, C0247, C0248
If equipped, the following actions may occur:
"Â The EBCM disables the ABS/TCS/VSES.
"Â The ABS indicator turns ON.
"Â The traction off indicator turns ON.
"Â The message center displays the SERVICE STABILITY SYSTEM message.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
An intermittent open/shorted solenoid DTC can be set by several different internal EBCM problems. Replace the EBCM if an open/shorted solenoid DTC 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
Use a 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 set?
Go to Step 3
Go to Diagnostic Aids
3
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 4
--
4
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 3
System OK
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Thursday, July 23rd, 2009 AT 9:48 PM
