Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
did you have the module programmed?
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CIRCUIT DESCRIPTIONAs the front wheels spin, the wheel speed sensors (WSS's) produce an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The powertrain control module (PCM) converts the data from the vehicle speed sensor (VSS) to a 128k pulses/mile signal. The EBCM uses the vehicle speed signal from the PCM in order to calculate the rear wheel speed.CONDITIONS FOR RUNNING THE DTCThe ignition is ON and the vehicle speed is between 24 km/h (15 mph) and 80 km/h (50 mph).CONDITIONS FOR SETTING THE DTCThe EBCM detects that one wheel speed input is 10 percent greater than or 10 percent less than the other wheel speed inputs within 3.2 km (2 mi) of driving.ACTION TAKEN WHEN THE DTC SETSIf equipped, the following actions 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.
CONDITIONS FOR CLEARING THE DTCThe conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.DIAGNOSTIC AIDSInstalling one tire of significantly different size on the vehicle causes DTC C0238 to set. Operating the vehicle with a tire that has very low air pressure may also set this DTC. Inspect the vehicle for an incorrect or damaged wheel speed sensor or vehicle speed sensor if the tires and the EBCM and PCM calibrations are OK.TEST DESCRIPTIONThe number below refers to the step number on the diagnostic table: