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Home >> Chrysler >> 2009 >> PT Cruiser Limited >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System (Service Information) >> Operation >> Antilock Brake System >> Drive-Off Cycle

Drive-Off Cycle

When the vehicle is first driven off, a humming may be heard or felt by the driver at approximately 25-40 km/h (15-25 mph). This is caused by brief activation of the ABS pump motor on the ICU and is a normal function of ABS as the system is performing a diagnosis check.