abs and trac light

whats up guys im back with another question my friend has a 2001 grand am with the 4 cyl in it and the other day while driving the abs, trac off and service vehicle soon came on and stayed on. but when u check for codes it doesnt throw any codes but when u shut the car off it goes off but as soon as you start driving it comes back on

To check for GM CHASSIS/ABS codes you need an ABS capable scanner or a GM Tech II machine. Sounds like you have the typical hub/wheelbearing/wheel sensor assembly problem.

ok do you have to fix that or is it like other ppl said just dirty and can clean it off and if you do have to fix it where is it exactly located at

ok do you have to fix that or is it like other ppl said just dirty and can clean it off and if you do have to fix it where is it exactly located at

Check the wiring to sensor that runs along the lower control arm first. Look for damaged wiring/cuts/frays. It will connect to a jack located at the hub. Remove connector, check for corrosion and clean with electrical contact cleaner and re-install making sure it it tight. This must be done for all four wheels since you do not know what sensor is bad at this point in time. If wiring is OK then the complete hub/bearing must be replaced since it comes as one unit. To determine which sensor is acting up you need to have it scanned with an ABS capable scanner, otherwise you can only guess as to which one is bad. Normally it is the front ones that go bad. Good luck!

ok thanks for the help