Last post on Nov 23, 2013 at 4:09 AM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Engine, Sedan
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#302 of 367 2007 Grand Prix won't start
Apr 30, 2012 (12:26 pm)
I have a 2007 Pontiac Grand Prix with 49,000 miles. At first the car would just die while driving, like someone unplugged or cut off the engine, no codes, no warnings, nothing. After the car would sit for two or three days it would start, run fine for a week or two and do the same thing. Took the car in several times to a GM mechanic, at first they could not duplicate the problem but when it finally happened to them they first replaced the ignition module, same thing happened again, then the crank sensor module, shaft whatever it's called was replaced, same thing happened again. Now the car won't start at all and "computer system failure" is popping up......can anyone tell me whats wrong?
#303 of 367 Bad ground connection or computer
Apr 30, 2012 (8:43 pm)
First things first. If there's a no start condition but the engine is trying to start. First a good diagnostic mechanic would inspect for ignition spark and fuel delivery. If one of the two is not functioning correctly that's why there's a no start. If there's no spark I would check the ignition coils. If there's no fuel I would check the fuel pump. Does your car have a alarm system? That could also cause the no start. Without no check engine light or codes the mechanic has to go to the basics. A lot of young mechanics with out trouble codes to direct them to the problem are lost. Those kind of mechanics will start installing parts guessing if that's the problem. No diagnostics or confirmation of failed part as you already experienced by a so called GM mechanic. Don't forget if you get that call you need this part your first question is how did you diagnosis the problem. Write down what he said he did to confirm a failed part and get back to me.
#304 of 367 Re: 2007 Grand Prix won't start [darlaj]
May 01, 2012 (5:12 am)
I'm sorry to see that your dealership is perhaps having a bit of difficulty in locating the root of the concern. If we can follow up with them, please email us at socialmediagm.com with more information (include your name/Edmunds username, phone and address, the last 8 of your VIN and current mileage, the name of your dealership and appointment details on visits pertaining to the no-start concern).
GM Customer Service
#305 of 367 Re: 2007 Grand Prix won't start [gmcustsvcsarah]
May 01, 2012 (6:48 am)
STAY AWAY from the dealerships they will fleece you for parts and not resolve the issue.
Check the ground cable near the battery. Typically, there is build up on the copper eye that is bolted to the frame. Remove the cable from the frame, sand it down to remove the build-up, bolt it back onto the frame, and paint with rust proof paint. There is another ground cable attached to the engine but I routinely just check the one by the battery. If you want a pic, I can send those. Try this before replacing sensors, etc.
The throttle body also gets significant build-up but this wouldn't keep you from starting - just rough idle. Your issue sound more electrical / ground related.
My 2005 Grand Prix had the same issue. SIX GM dealerships couldn't tell me why my vehicle would go dead flying down the highway with no gas, pwoer steering, or instrumentation. My initial dealership was Roy Foss in Woodbridge - what a bunch dishonest crooks. I hope they lost their dealership in the cuts. I would buy another GM Vehicle but for my experience with these dealerships. Buy FORD next time they appear to know what they are doing.
#306 of 367 Re: 2007 Grand Prix won't start [prochie]
May 01, 2012 (10:55 am)
thanks Poochie, I will try it and see what happens. To Sarah, thanks but My issue goes a lot beyond what I would like to discuss on this forum, I'm out a lot of money and have a vehicle I can't drive. I will just leave it at that, I'm just looking for some answers for my own benefit.
#307 of 367 2004 grand prix codes wont clear
Jul 02, 2012 (2:25 pm)
we repaired the ..o2 sencer,,,check eng light went off,,,but D.M.V. says codes read "not ready yet" do you have to drive the car 50 miles before the codes clear?
#308 of 367 girl needs help
Jul 09, 2012 (6:46 am)
i have a 99 grand prix gt. it was running great. then i went outside to leave and it wouldnt start. it turns over and everything just wont stay on. when you first try to start it after it has been sitting it will stay on for about 5 mins then it chokes out. after it broke we changed the spark plugs and wires, we also changed the mass air flow sensor. after we changed the sensor the car did one good drive then it did the exact same thing. the car will sometimes stay on if you keep the rpms over 2k. can anyone please help me so i dont have to take it in. any questions you have to ask ill answer to the best of my abilities. i just wanna try to fix it. i also just read that when your crank sensor goes your trac light turns on. i would like to know if that is true. cause mine has been on for a week and i cant turn it off
#309 of 367 Re: girl needs help [nicole586]
Jul 09, 2012 (10:26 am)
I had a 99 chrysler 300m that did the same thing, it turned out to be the crank and cam sensor. I would suggest you take it to your mechanic and have them retrieve any trouble codes. At least this way they can tell you exactly what the issue is and what it will cost to fix it. It sounds like the same issue to me. Hope this helps.
#310 of 367 starting problems
Jul 12, 2012 (3:34 pm)
sometimes it wont start and sometimes it does...when it does start it runs great...but when it don;t start i have to turn the key over til the radio and lights works...wait until the secruity light goes out...then i turn it off and pull the key out and put it back in and the car starts...can anyone help me with this?
#311 of 367 some time it wont start
Jul 25, 2012 (1:16 pm)
am begin to think i brought a lemon or a car 2005 grand prix drive good and look good but some time get in car and it start right up and sometimes i get in i have to start it 2 or three times only had the car 2 weeks and i do have 3 year warranty i already took it to two place they send me to! and each time the car start good! So they dont seem think nothing wrong with the car! But am not crazy this car has starting problem! but it not all time but it enough!