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Re: 99 Alero TRACK OFF light
I had a GrandAm that used to do the exact same thing. I checked the ABS sensors and the wires from them and I had a couple with bad sensors and one with corroded wires and connector plug. That is the most likely cause of your "track off" light problems.
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U073 is a communication code from one module to another to simply put it. Code U073 refers to a communication problem with the electronic brake control module ( Which controls ABS/Traction and stability ). I would suspect a loose connection/shorted wiring or even possible internal problem with the brake control module.If the issue occurs after hitting a bump, most likely a loose connection or the wiring rubbing somewhere causing a short from the brake control module.
your brake light is probably coming on because the fluid is to low in the resevoir. ther is a sensor in the brake fluid resevoir that is on a float. if the fluid gets to low the sensor tells thebrake light to come on . so if the fluid is just high enough to keep the light off, everytime you hit a bump the fluid sloshes around causing the float to drop and the sensor to turn the brake light on. also when your brake fluid level is low it tells you that you will either need new brakes soon or you might have a leak.
MOST OF THE TIME WHEN TRAC LIGHT AND ABS BRAKE LIGHT COMES ON YOU A HAVE A PROBLEM IN THE ABS AND TRAC SYSTEM.THIS IS A DEALERSHIP FIX. YOU CAN CHECK ABS BRAKE FUSES MAKE SURE IT IS IN TIGHT.AND CHECK FOR FAULTY ABS RELAYS.TO CHECK RELAY LOOK AT RELAY TERMINALS YOU HAVE TERMINAL 86 AND TERMINAL 85.YOU CONNECT TERMINAL 85 TO GROUND AND TERMINAL 86 TO BATTERY POSITIVE TERMINAL.IF RELAY CLICKS WHEN BATTERY VOLTAGE IS APPLIED.RELAY IS WORKING IF YOU HEAR NO CLICK RELAY NO GOOD NEEDS REPLACING.
Sounds like the wheel bearing... try jacking the car up and moving the rotor forward or backward. if you hear a grinding noise, or if the rotor moves sideways... like rock it.. then its definately that. I have the same problem with the service engine soon light... try removing the positive on the battery then waiting 30 seconds and putting back on. should reset the cpu.