A few of the specific General Motors automobile models that may develop this problem include the Grand Am, Fiero, Firebird, Trans Am, GTO, G6, Bonneville, Montana, Aztek, Vue, Sky, Aura, Outlook, Astra, Ion, Corvette, Lumina, El Camino, Impala, Monte Carlo, Venture, Regal, Century, LeSabre, Park Avenue, Riviera, Aurora, Intrigue, Silhouette, Eldorado, Seville, Catera and other W-Body or E-Body cars.

The most obvious symptoms of this problem are the "ABS" and "TCS OFF" warning lights being lit up on your dashboard's instrument panel.

Other warnings you might see depending on your vehicle model may include the "SES", "Check Engine", "Trac Off" or "Service Engine Soon" warning lights.

I made this issue a first priority to check due to the safety concerns.

I verified that my brake pads had plenty of life left and topped off the brake fluid reservoir with Prestone DOT 3 fluid to the correct level.

I also noticed that after the ABS & TCS OFF lights came on, my power steering became stiffer and the car was harder to turn in parking lots.

I removed the coolant overflow bottle (10mm bolts), and my aftermarket Buick STB (strut tower brace) (13mm bolts) to access the power steering fluid reservoir and it was a bit low.

I used a funnel and a rubber hose to pour the Pyroil power steering fluid in to the reservoir.

Then I took the car for a test drive, did some online research, and realized that the power steering problem was due to the ABS/TCS issue.

Since the vehicle's computer could not read the WSS (wheel speed sensor) a.k.a. VSS (vehicle speed sensor) in one or more of the wheel hubs, it disabled the Magnasteer (speed sensitive power steering feature).

I've also read that on some GM models the computer may also disable the cruise control feature.

I'll just ramble them off for you.

Check for wire damage from rodents, rats, mice, abrasion, or rubbing and replace or repair the wiring harness or connectors.

Check for brake dust accumulation on the ABS ring, but I don't believe this applies to the Pontiac Grand Prix since it uses a sealed wheel bearing hub with integrated anti lock braking sensor.

Check the wire connection points for corrosion, rust, missing contacts, loose wires, grounded wires, or cracked insulation.

Check for water in/around the main brake light bulbs, the third brake light and the tail light sockets common ground which may cause a short.

Check the tires for extreme pressure differences or deviations from the recommended settings.

Check the battery terminals for corrosion or loose connections.

Finally, check the ECM (engine control module a.k.a. "ECU" engine control unit, in the air box), EBCM (electronic brake control module, under the dash), and EBTCM (electronic brake traction control module, on the master brake cylinder ABS mount) for broken connectors or wiring.

I inspected all of the wiring and connections but found nothing wrong.

I cleaned the connectors with a can of Dust Off compressed air and a small wire brush.

To reset the error codes, I removed the battery's negative ( "-" black wire) for about an hour and then reattached it.

Not more than a few minutes into the next test drive, the ABS, TCS OFF and SES lights all came on.

I went to a trusted local repair shop to have them scan the vehicle's computer for error codes.

Depending on your vehicle model you or the mechanic may need an ABS scanner, OBD scanner, OBD II scanner, a Tech 2 scanner or an OHM meter.

My brother and I had just replaced both of the front hubs less than a year ago with CarQuest brand parts that were made in South Korea.

Since the part had a warranty, I went back to the CarQuest auto parts store, exchanged it for a new one and installed the new part.

For step by step instructions click on the following link - GM wheel bearing hub replacement guide.

As far as I know right now, replacing that hub has solved my ABS/TCS/SES error codes. Be sure to disconnect the battery cable and let the computer's error codes clear out while you replace the hub.

Replacement wheel bearing hubs can be purchased for about $60 to $200 and some of the better known brand names are Timken (Mexico), DynaPak (China), and BCA.

My first replacement hub was a Dynapak and it made a loud popping noise while turning at low speeds.

I hope this guide has been helpful for some of you. Please be sure to take a look at some of my other vehicle maintenance pages such as the Grand Prix Power Window Motor & Regulator Replacement Guide, the Eaton M90 Supercharge Oil Change, the GM 3800 Series II Alternator Replacement Guide, the PCV Valve Replacement Guide, and the Grand Prix Oil Change Guide.

For more, check out all of my GM Pontiac Grand Prix Repair & Maintenance Guides.