Diagnostic Trouble Code: B0020
Diagnostic Trouble Code Name: Passenger Frontal Deployment Loop Stage 2
Vehicle Make: Chevrolet
Vehicle Model: Cruze (J300)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
Cruise Control Brake Switch Circuit
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0571
Circuit / System Description
The stop lamp switch signal circuit is a high voltage input from the body control module (BCM) to the engine control module (ECM) and transmission control module (TCM). The ECM monitors the stop lamp switch circuit to detect when the brake pedal has been applied. The BCM monitors the brake pedal position sensor to determine when the brake pedal is applied. When the brake pedal is applied, the BCM supplies a high voltage signal on the brake applied signal circuit and also sends a serial data message to the ECM indicating that the brake pedal has been applied. The ECM senses a high voltage signal on the brake applied signal circuit when the brake pedal has been applied.
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