Question about 2003 Pontiac Grand Am

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2003 Grand AM Service engine soon light is on, ABS light is on and Traction control light is on. I suspect it is one of the wheel sensors? And if so which one?

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There is a variety of things that could cause the light to come on, you will need to have the car scanned for codes to verify what is causing the MIL, ABS, and TRAC lights to come on. No way to determine this until you have it scanned.

Posted on Nov 16, 2009

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You would need a scaner to pull data out of your computer, go into the A.B.S. mode scroll to wheel speed sensor, while some one drives the car for you, check MPH on front and rear wheels sensor, the one that show 0 MPH is the bad sensor. Replace and recheck, Also check harnness first.

Posted on Nov 16, 2009

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1 Answer

Abs light came on


What it looks like: The traction control warning light typically takes the form of the acronym "TC." Sometimes this light is a small illuminated picture of a car losing control What it looks like: The traction control warning light typically takes the form of the acronym "TC." Sometimes this light is a small illuminated picture of a car losing control. How this system works: Traction control uses wheel speed sensors to detect when one or more of the car's wheels lose grip and traction. When the system registers a loss of traction in one or more of the wheels, a computer will limit power to the wheels that are still in solid contact with the road to prevent a skid. Common reasons for this to happen:
  • ABS is malfunctioning: Traction control and ABS (anti-lock braking system) often share the same control module and internal self-diagnostics system. As a result, sometimes an issue in the ABS can trigger the traction control light. If this is the case, then both the ABS and Traction Control lights will be on.
  • Broken wheel speed sensors: Wheel speed sensors are usually in the wheel bearing assembly, and determine the rate at which each wheel is moving. The sensors relay that information to the traction control module, which determines whether or not power needs to be shifted. Wheel speed sensors can get dirty or damaged and stop working, which prohibits the traction control module from knowing when to enable the system.Traction control module is faulty: The traction control module - which, again, is often shared with the ABS - can malfunction and break altogether, causing the system to stop working. What to expect: A top-rated mobile mechanic will come to your home or office to determine the source and cause of the traction control issue, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs. How important is this service? It's important to have the traction control issue investigated as soon as possible, as adverse driving conditions can arise at any time. While your car is unlikely to incur further damage from a faulty traction control system, it won't be safe to drive in rain, snow, sleet, or other inclement weather, or even possibly through pools of water on the road. Furthermore, the issue that is causing the traction control light to illuminate could also be impacting the ABS.

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Traction control usually uses part of your ABS brake system to function. Sometimes a dirty (or worn out) wheel sensor is the problem that triggers both "check engine" and "traction control"...This can be verified with the proper diagnostic meter, and many shops will perform this test for free...unfortunately the free check at the auto parts stores does not include reading the ABS/Traction sensors...sensor cost is about $65. sometimes they can be cleaned. Hope this helps.

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As I was driving down the road, all at once 4 warning lights came on my dash at once (Check Engine Soon, Service Engine Soon, ABS, & Trac Off Indicators). What could be wrong, the car still ran fine...


It's most likely going to be the wheel speed sensor which is located at the wheel bearing. when they become disconnected or the wire breaks your abs and traction light will come on and something your check engine light.

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You can test the wheel speed sensors by unhooking the connectors and put ohmeter test leads on the sensor terminals should read around 1100-1600 ohms also the connectors themselves were bad for wires breaking inside the insulation at the connectors from flexing when the wheel is turned back and forth..Note excessive wheel bearing noise from bad bearings have also been known for interferring with clean abs signal also causing abs codes good luck

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5 Answers

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If your trac and abs are both on. the problem could be a wheel speed sensor.
on some GM cars this sensor is built into the vehichles hub unit. making the bering and sensor one sealed unit. cheap hub units can be gotten (under 100 bucks) at autozone

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1 Answer

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One of your wheel speed sensors is not functioning and this is why you are having the abs and trac control light. These are on the back side of your wheel bearing hub assembly and you may have a broken wire or a damaged sensor. Check all four of these visually and with a continuity tester to find the bad one. The check engine light is usually emissions related and I would suggest replacing your O2 sensor.

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Sounds like you have a bad wheel speed sensor. You need to have it scanned. Since it's been sitting, it might just be a bad connection to one of the speed sensors.

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1 Answer

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It is one of your wheel bearings. The problem is easily solved by taking the car to a dealer, or having a code reader, and determining which wheel bearing is bad. The wheel bearing is under $150 and should be installed by someone with some muscle, as the bolts are torqued from the factory extremely tight in a tight location. The wheel bearing have all of your sensors for abs built into them and if that sensor goes out your computer tells the abs and traction control to shut down, hence you get the lights on on the dash.

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1 Answer

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An ABS sensor DOES affect the traction control system. Traction control uses these sensors to determine if a wheel is losing traction. A bad sensor will cause both the ABS and TRACTION lights to come on.
The CHECK ENGINE light however is going to be a seperate problem.

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