Siciliano15

iTrader: (7)

hey guys i wanted to see if anyone knows what could be causing this problem.... all of a sudden one day my ABS INOP light came on and the TCS OFF light came on and i cant turn the tcs back on. i checked all of the fuses and they were all ok. unplugged the battery and plugged it back in and still the same problem....

'98 trans am automatic

Siciliano15

iTrader: (7)

anyone ever have this happen to them? i read online it could be tied to the third brake light bulb but i checked those and they work so wat else could it be?

ULTIMATEORANGESS

iTrader: (4)

do you have over sized tires on your car?

Siciliano15

iTrader: (7)

no. 315/35/17 rear and 265/40/17 front. diameters are within ¼" of each other

Asian LSX

iTrader: (4)

It could be a wheel speed sensor.

rjparth

Sounds like sensor/electrical to me. I'd be looking for damaged wiring and/or bad sensors if they both came on at the same time. Fuses too but you already checked them.

Siciliano15

iTrader: (7)

is there anywhere to check for codes or is it not stored in the pcm? hate to start changing all of the sensors if its just one....

92SilverSHO

iTrader: (3)

When my battery was on its way out, i had those lights popup off and on. New battery, no more lights and that was over 2 years ago.

CUR4VNM

iTrader: (10)

this happens to me in my 01 gmc sierra but it doesnt happen all the time, dont mean to hijack but i am interested in this too. hope you get the problem solved

Siciliano15

iTrader: (7)

nah its all good. i changed the battery just a few months ago with an OEM one so i guess its probably something to do with the sensors

Z28/2002

iTrader: (27)

Is the brake light on also?

Hashish

iTrader: (1)

I have been having some ABS related issues that trip a TCS off light sometimes, as well as throw the ABS Inop light, but never at the same time. Anyway, my issue is a bad/going bad wheels speed sensor. If you know anyone with a more in depth scan tool or take it to the dealer they can pull your ABS codes and you can see the problem.

rabbit320

iTrader: (11)

def check the sensors, and about a foot down the wire from the sensor going to the body (if that makes sense) there is another extension connector around the lower a-arms in front, and around lca's in rear along the same wires. for me it was this connection not the speed sensor that was giving it a faulty signal. also check your PWR ACCRY fuse on the panel inside the drivers door, cant remember why but this helped also; or other fuses in same spot or under hood...

CUR4VNM

iTrader: (10)

interesting but definately good things to look into

Siciliano15

iTrader: (7)

thanks ill try those things out. yep all 3 lights are on steady. "brake", "tcs off", and "abs inop"

Deviant LS1

iTrader: (4)

Get the codes scanned with an ABS scan tool and report back.

Siciliano15

iTrader: (7)

i have the HPTuners do u think that will be able to scan or does that only read the pcm?

JRENIGAR

iTrader: (37)

I have this problem and had it scanned with a snap-on scanner. It is the abs module itself going out. The 3 lights are off every morning when I first start the car and I usually drive for 5 miles or so and all 3 lights come on at once. When this happens the tcs sys is not able to be re acvtivated till the car sits overnight and all the lights go back out. I have since aquired hp tuners myself but havent tried to read codes with it yet. Hope this helps.

Siciliano15

iTrader: (7)

oh dam. good info. is the abs module an expensive piece to replace?

mypoorLS1

iTrader: (4)

ABS module. I got mine from a junkyard with a guarantee. It was still like $500 or something.