Question about 2002 GMC Yukon XL
Our Matrix ABS light comes on (sometimes coincisdes with a grabbing of the brakes). It comes and goes. ABS still seems active - I jammed the brakes on one day whilst driving on a wet road and it didn't lock up.
The other issue is the Check Engine light come (sometimes) on when the car is downshifting from 4th to 3rd. Then the auto transmission will not sellect either 1st or 4th. Can be reset by restarting the car. Can be avoided by pushing the Overdrive Off button (but then it can't select 4th).
Any help appreciated!
Your ABS likely has a very dirty reluctor (can happen if the teeth get mud or brake dust in them) or possibly one of your speed sensors is starting to weaken and is close to failure. The proper diagnostic sequence is to have the trouble codes pulled from ABS and Engine modules and determine what the computers SAW when the lights were turned on. Most likely based on description, your ABS will have a speed sensor code, and your engine and/or trans module will have a transmission related trouble code. Very few transmission codes are things you can service at home, usually youll see solenoid or gear slippage codes...mostly those require internal repairs that often require removal of the valve body or rebuild of the transmission.
Make sure you check fluid level, that is the most common cause of transmission slippage codes, however if fluid is full, it indicates that unless the fluid has failed completely, you may need transmission repairs.
Posted on Sep 09, 2009
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Posted on Jan 02, 2017
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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html Fading Sinking Brake pedal? http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html Brakes make Grinding noise? http://repairhelpcenter.blogspot.in/2012/06/toyota-corolla-brakes-make-grinding.html
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