Question about 2002 GMC Yukon XL
During a recent trip my 2001 Yukon XL's ABS & Traction Control dash light came on and after it was parked in the driveway with the key off, the ABS pump was running. I pulled the fuse to stop the pump. What is the proper fix and proceedures? What about bleeding the brake system if replacement is needed?
The 1st thing u need to do is have the system tested for ABS trouble codes, with this code you will have some idea where to look for the problem, this could be as simple as the ABS pump relay, the relay's contacts can stick and cause the pump to run all the time, the relay is under the hood. as to the the bleeding, this requires a special ABS capable scan tool to hold the pop it valves open in the ABS hydraulic valve module while you bleed the brakes, without it you will never get the brakes bleed, due to the cost of the scan tool the dealer is the best option if u do end up having to open the system up for repair.
Posted on Apr 17, 2009
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Posted on Jan 02, 2017
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For Chevrolet only, the shift lever is in FIRST (1) or SECOND (2) gear. The EBCM receives a class 2 message from the powertrain control module (PCM) indicating the gear position.
For Pontiac and Oldsmobile only, the body control module (BCM) detects that the traction control switch is pressed (signal circuit is low). The EBCM receives a class 2 message from the BCM indicating the switch status.
The BCM detects that the park brake is engaged (signal circuit is low) and that the engine is on. The EBCM receives a class 2 message from the BCM indicating the park brake status.
The PCM detects certain malfunctions and is unable to perform torque reduction requests from the EBCM. The EBCM receives a class 2 message from the PCM indicating that traction control cannot be performed.
The EBCM detects a malfunction in the traction control system. The IPC receives class 2 messages from the EBCM requesting illumination of both the service vehicle soon and traction off indicators.
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
With the light lit there are DTC'S - diagnostic trouble codes stored in the EBCM -
Traction Off: Refer to ABS Description and Operation in Antilock Brake System
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