Possible Problem with the ABS Module

**SRoush87** · 04-10-2012

Hey everyone! New here. I am a big fan of the Grand Prix. I have had 4 GP's and the current one I have is an 04 GTP. I am having problems with the following warning lights: ABS, Brake, TC, Variable Effort Steering, and low tire pressure (which we have tried to reset, but are now guessing it has something to do with the other warning lights). Every once in a VERY blue moon these lights will go off but will come back on either while driving or with restarting. I have heard that we may have to replace the ABS module, however because those little boogers are so pricey, was wondering if anyone else has had this problem and what the solution was if any. I've also heard that these sensors can get dirt in them and was also wondering since sometimes like I said, in a blue moon, the lights will go off if this could be the case of just having dirt in there. Thanks in advance for all your help!

**SlowNA06** · 04-10-2012

Scan it with a Tech II. There's a couple other scanners, but we know a Tech II will definitely pull the code for ABS modules.

And for the love of god, get it rebuilt. Don't buy a new one. New ones fail, also. Rebuilt ones are invincible. And only like $150.

**MoarkatsINmuhtrailer** · 04-10-2012

sometimes humidity/wet weather can penetrate the seals of the connectors causing moisture to get in and create a temporary short that will last for an undetermined amount of time.

what you can do to know if it is the abs module, is when the light is on, have a shop check it with their abs scanner. if it pops a code up then follow that code to whatever (ie: a wheel hub, sensor etc..)

If, the scanner cannot communicate with the vehicles abs computer, then it is most likely your module.

Instead of purchasing a new module, you can have yours rebuilt, and very well i might add. ModuleMaster rebuilds ABS modules for as low as $100, 2 day average turn-around, 5 Year Guarantee

module master has rebuilt a couple members abs units on here, for example brandonl2000 created a thread about this, if you need more info on this route, shoot him a pm and he'll help you out the best he can.

**Scottydoggs** · 04-10-2012

sounds like a bad wheel hub/wheel speed sensor, its in the hub one piece unit.

you can also check the plugs at the hub, take them off clean them a dab of di electrical grease on the plug ends, and check the wires for damage, they snap on to the lca's and get messed up sometimes.

you can also take the car to a shop that can scan abs codes, most of the time its not a free scan unless they are doing the repair work them self's. but the scan will tell you just what needs to be replaced or repaired.

**SlowNA06** · 04-10-2012

There's a guy that does it cheaper, too, I just forgot.

**Toms04compg** · 04-10-2012

I dealing with the same issue my friend changed 2 bad hubs keep us posted.

**SRoush87** · 04-10-2012

Thanks guys for the replies. We will take a look at these solutions and see what we come up with. I will keep everyone posted.

**ronmexico** · 04-11-2012

I am going through the same thing at the moment.... You can test your speed sensors pretty easily. Jack the car up, disconnect ABS harness plug from the ABS module. Using a volt/ohm meter measure the resistance between each of the wheel sensor pins.... should be about 1K ohm. Now measure the A/C voltage between the pins while someone spins the wheel, should get something in the neighborhood of 100mv. If you have an oscilloscope use that, it should show the A/C wave form as it spins.

You can also measure at the wheel sensors but it is better to just measure it at the pins since it will detect a wiring problem in the harness (e.g. wire break). Of course, if you find a problem, take the tire off and measure the sensor directly to rule out a harness problem.

I just broke down and bought a equus 3160 scanner so I can read/reset the ABS codes ($200).... Part of the problem is if you do find a bad sensor and replace the bearing, it will take 100 ignition cycles for the ABS computer to turn off the light (according to the bosch manual anyways).

**sseilmnop** · 04-11-2012

This scanner is $86 and does most abs ,airbag and engine codes.

http://www.amazon.com/gp/product/B00...ce-full-site=1

Sounds like a wheel bearing if your getting tire pressure warning. Wouldn't think tire pressure is tied to abs module just the wheel bearings. If its a wheel bearing bad and you replace it the abs light will go off immediately.

Best way is read the codes!

**SlowNA06** · 04-11-2012

Originally Posted by sseilmnop

Wouldn't think tire pressure is tied to abs module just the wheel bearings.

It is.

Oh, I checked the applications for that scanner: It's fine for the op and anyone 99-08, but for anyone with a 97 or 98, you're s.o.l.

http://www2.otctools.com/otctools.co...products/1.pdf

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