I have an intermittant fault on my Cruise Control (fitted by factory). I set it to 70mph on the motorway and then it will switch itself off for no apparent reason. Often it does it when you finish indicating left after moving lanes, but has done it whilst in a straight line. When it does switch off it often takes several attempts at pressing resume to get it to stay on again. P0571 Cruise Control/Brake Switch A Circuit Malfunction Indicator. The PCM has detected an electrical malfunction with the cruise control brake switch “A” circuit. Code Set Parameters. The PCM works in conjunction with the cruise control module on most vehicle applications to control vehicle speed automatically.
AutoCodesOBDII Code List B3794 BUICK
Repair Difficulty Level: 3/3
Possible causes
- Faulty Cruise Control Switch
- Cruise Control Switch harness is open or shorted
- Cruise Control Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3794 Buick Description
The Cruise Control Switch is an input to the Body Control Module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The Engine Control Module (ECM) receives the requested cruise control switch function from the BCM via a serial data message. The BCM monitors the cruise control switch. The BCM sets the OBDII code when the cruise control switch is not to factory specifications.Need more help?
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B3794 BUICK Comments
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Discussion in 'Car Audio / Electrical / Security / Diagnostic Related' started by macdanger, Nov 4, 2018.
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