C0274 GMC – Excessive Dump/Isolation Time

C0274 GMC Possible Symptoms

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

C0274 GMC Possible Causes

Faulty Brake Pressure Modulator Valve (BPMV),Brake Pressure Modulator Valve (BPMV) harness is open or shorted,Brake Pressure Modulator Valve (BPMV) circuit poor electrical connection

C0274 GMC Description

The Electronic Brake Control Module (EBCM) microprocessor grounds the isolation coil to energize and close the isolation valve. This will prevent any additional brake pressure applied by the driver from reaching the wheel. Further increases in brake pressure will be prohibited. Each isolation valve is closed independently to isolate each wheel. The EBCM microprocessor also uses software subroutine to monitor for any ABS event which would initiate an isolation command. This subroutine is performed every 1.0 second.