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Pontiac Grand Am Service Engine Soon / ABS / Trac Off

Well, those three things pretty much sum up what im going through right now. All three lights are on and when you make a hard right or left turn and accelerate at low speed the car seems like the drivetrain is missing, almost like it's skipping. If anyone has any suggestions please let me know.


  • kmajorskmajors Posts: 17
    Go to a parts store like O'Riely or AutoZone and use the code scanner. That should give you a good place to start. You can use the code scanner for free or very low cost. You do NOT need to buy one.

    This could be anything from a cracked vacuum line to a bad computer. The scanner will tell you what the computer thinks is wrong.
  • These lights are all on, I am more worried about the ABS and Brake lights. It won't let me shift out of park. I have to use the overide switch. The guys at tire pros said they replaced the ABS Brake relay.. that seemed to fix the problem... for a few weeks. Now I am having the same problem. First off does anyone know where the that relay is, and secondly does anyone know what the ATC is?
  • ac4ac4 Posts: 1
    I am going through the same thing but I am not experiencing the missing or skipping. One of the guys I work with has the same car and had the same problem. He had it serviced at the dealer and they replaced the hub assembly. This seems to have fixed it for the time being. I guess I will have to do the same thing. It sounds like it is a $700-$900cdn touch.
  • I have about 71k on my GA and I have already replaced both the left and right wheel bearing retaining hubs. Recently over the last 2 months these lights have been coming on intermittently, generally when driving in wet weather. Any ideas? Would it be one of the two hubs or is it likely one of the sensors elsewhere on the vehicle?
  • ray80ray80 Posts: 1,233
    Could be problem in wiring/harness 'somewhere'
  • could be, but the cost for me to take a look at the entire electrical system is going to be more than I can afford!
  • ATC stands for automatic traction control. If your car is a 2000 or newer you might find the anti lock brake relay underneath the battery tray along the left frame rail of the car.
  • If you go to auto zone they will plug the code scanner into your car for free. The code will probably come up as a vacuum problem, and or a 0300 code which is multiple misfires, but don't sweat the car is probably not misfiring it's all comeing from the faulty electrical system.
  • i"m new to this site so tell me what can i do besides take it in and be serviced, since late january 2007 abs trac comes on /serv engine /brake well brake goes off,but after 2-6 miles down the road brake comes on, and tires have a roaring soundwhen accelerating but other than that (i know its the wheel right hub) it drives great still when i first got it back in sept 06 checked for recalls and problems before on line excellent condition 98,000 actual miles :confuse:
  • carguy38carguy38 Posts: 4
    I replaced all four of my wheel hubs, and put new calipers on all four wheels. The car drives fine, but all the lights are still on, with the addition of the red brake light. I have been working on and driving GM vehicles for years, and I have never experienced this problem. I am getting ready to run a full diagnostic check on the entire system of the car. From the engine all the way to the exhaust and everything in between. I will post a message as soon as I find out exactly what the problem is, and how to fix it.
  • carguy38carguy38 Posts: 4
    I ran a check on the system of the car, and I've discovered that the EBCM (electronic brake control module) is what's causing the problem with the lights. The module costs around $600.00 but you might be able to go to a dealer and have the tech reprogram the module. Besides that the only other thing I can come up with is the wheel speed sensors, but that won't cause the red brake light to come on. So I hope this will help anyone out there with problems.
  • jenwjenw Posts: 3
    I have a 99 Grand Am SE and the service engine soon and trac off lights have been on for awhile now. I used a scanner on it and the only thing it told me was the engine was misfiring. I replaced the hubs because I thought the wheel sensors were bad. They weren't because the lights are still on. When the trac off light is on, the engine will rev up and down when I hit the brakes. I took it to a mechanic who did a full body scan and he told me the trac off light was from the body control module and I would have to replace it and have it reprogrammed. Everything I read stated the engine control module needed reprogrammed, nothing about the body control module? Does anyone know for sure which one really needs replaced and reprogrammed? Also, the service engine soon light was said to be a problem with the idle control motor and I needed to replace it. Can the problem with the ecm or bcm be the cause of the idle control motor? I hate to replace all the parts if only one is bad. Has anyone else experienced this? How hard is it to replace the modules? They are in the dash but I'm not sure how easy it will be get to them and replace them.

  • ray80ray80 Posts: 1,233
    I wouldn't be at all sure the BCM would have anything to do with T/C light (other then perhaps haveing input to make it light). On other vehicles the T/C problem could be problem with connecter to speed sensor in wheel (either corrosion or broken wire)
  • kisbowlkisbowl Posts: 2
    I had the same thing happen like you Jen, I changed the ignition module and it was fine after that.
  • roxp55roxp55 Posts: 3
    yes...actually my 2000 grand am (127,000 mi.) is in the shop now as I speak. Service engine soon, ABS, trac off, low trac, all came on the other day. They told me it usually is the ignition switch which I am having replaced, cost around $250 (part & labor). Besides that I have had no problems with my car. :)
  • stevew2stevew2 Posts: 3
    Roxp or Kisb,

    Did replacing the ignition switch work? I have replaced hubs and the abs computer. I would have never guessed the "ignition" switch. I'm wondering what the ignition switch would have to do with the traction control and abs.

    PLease write back and let me know if it was the ignition switch. thanks
  • burdawgburdawg Posts: 1,521
    Make sure your gas tank cap is sealing properly. You'd be surprised to know how many service engine soon problems are caused by gas tank caps either not being tight, on crooked, or having a broken seal.
  • christihchristih Posts: 3
    Hi - Did you ever find a solution to this? After reading other posts, sounds like a common problem for these cars. I have a 2000 doing the same things. I am starting to get a lurching motion when the "trac off" light pops on. My main question is, I'm going out of town tomorrow - 230 miles out and back. Do you think it would be safe to drive?
  • christihchristih Posts: 3
    Hi - Did you ever find a solution to this? After reading other posts, sounds like a common problem for these cars. I have a 2000 doing the same things. I am starting to get a lurching motion when the "trac off" light pops on. My main question is, I'm going out of town tomorrow - 230 miles out and back. How long did yours last before you (hopefully) got it fixed? Do you think it would be safe to drive?
  • christihchristih Posts: 3
    I'm having the same problems. Does the ignition module have anything to do with the car starting? I've noticed that it starts a little rough sometimes - did you experience that along with the lights popping on?

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