4th Oct 2007, 17:06

I bought a used 2000 Pontiac Grand Prix, last year. Have had no problems until a few weeks ago, when it kinda started sputtering. Once I reached 70mph or so, it stopped. Yesterday when I cranked it, there was a loud 'tapptapptapp' noise. A friend listened to it and said maybe the "rocker arm"? I also found transmission fluid in my radiator, and water in my transmission fluid.

Now what? Any ideas on what this is going to cost me? I'm still paying for the car...

4th Oct 2007, 23:38

Well, if you continue to drive, you're gonna mess it up. It could be that you just have a bad trans cooler and need a new radiator and what not. Id check it before driving it more.

5th Oct 2007, 07:35

Thanks..but it is totally parked after the noise. I am trying to find a shop to get it into. How do you find a mechanic you can trust? Especially as a woman saying: "uuuhh..it's going taptaptap"? I just moved out of state and have no friends to ask..sucks.

15th Nov 2007, 18:44

My 2002 Grand Prix started acting up at 86000 mile. If you drive it normally and do not step on the gas it seems to be fine. When I would put my foot into it the tack would go to 6000 and the car would not move. I talked to my mechanic and he said it sounds like a transmission problem. He recommended some one and they looked into it. Being an very honest guy he said it was not the transmission, but it was other failures like the fuel filter, air flow sensor and throttle body cleaning. All the tranny Diagnostics came up negative. I got the car back and it has more pep, but still has the same problem. Any suggestions???

16th Nov 2007, 00:33

I was thinking about buying a 2000 Pontiac Grand Prix GTP with about 90k miles, but after all these reviews I don't think it is worth it, what do you think?


8th Dec 2007, 16:16

I have a 2000 GTP. I have replaced all 4 struts, brakes and rotors, supercharger, ceramic resistor (for GTP models only), plugs and wires, windage tray, tranny fluid (added shift kit), front sway bar (stock sway bar split at casting seem), tie rods, belts, a bunch of sensors, fluid filter, and now the car has a vibration felt in the steering wheel and through the car. I am pretty sure that it is the rack! It is a nice car, but it is costly to own. I will be getting rid of this car in the near future, probably for an ACURA!

30th Jan 2008, 21:27

I just bought a 2000 grand prix gt... and I wish I would have read this site first! It's pretty, I've had it so far 3 days..haha. Well it ran good the 1st 2 days...now... If I turn the heater on the lights go out... i can turn the lights off and on with the heater knob! what could this possibly be? But it shifts great rides smooth. It has about 160,000 miles on it... seems well taken care of. I'm starting to think I should have never gotten it though I don't got much money... I just spent my savings buying the stupid car! Does anyone have a good comment about the car? I have not seen one good thing said about a 2000 grand prix... GM really needs to look into this issue...deeply...

Well thanks.

13th Mar 2008, 16:55

I am a 2nd time buyer of the Grand Prix - 1st was a 1999 drove it for 5 + years... absolutely loved it. No problems whatsoever. Unfortunately it was totalled while parked on the street. Came across a great deal on a 2000 - my mechanic recommended based on the fact that he has known the car, maintenance and owner since day one. I thought great. Now I can't complain about any mechanical issues... however I am about ready to torch it due to the fact that getting my keys out of the ignition is a hit and miss prospect. So frustrated that I am actually posting a comment here. To add insult to injury... doesn't ever seem to happen when I need it to... like in front of my mechanic. I am so tired of sitting in parking lots or outside of work, in my garage... just waiting for some intervention to come along and release my keys from the ignition. Other than this glitch - and I am presuming it is limited to the 2000 year, I would buy another Grand Prix in a heartbeat. Mileage is great, comfortable ride, handles great in the winter (Saskatchewan Canada Snowstorms), roomy for passengers - no major mechanical issues in the 7 years I have been a Grand Prix owner.

29th Apr 2008, 11:20

I seem to have a common problem with my 99 Grand Prix. Frequently after it warms up it starts shifting very hard, accompanied by a loud whining noise from under the hood. From what I have been reading, a few people have had success with this problem by replacing the pressure control sensor. Others said a new software upgrade did the trick.

I love this car but from what I have seen on a few message boards the automatic trannies in these Grand Prix's can be a nightmare.

I have an appointment at the dealers on the eighth for a look see, so wish me luck.

6th May 2008, 14:52

I have a '99 Pontiac Grand Prix GT 4door Sedan. BEWARE before even thinking about buying a Pontiac. After reading everyone's comments it seems like people are all experiencing the same problem.. The transmission. I bought this car used at 75,000 and within 10,000 of owning it the car started shifting WAY HARD and total loss of power when accelerating. Took it in... Pressure Solenoid (Spelling?). So now it's been 5 years and guess what?? the damn thing went out again. Here goes another $600.00 fix, What a way to spend tax money!!!

25th May 2008, 10:40

I have a 2001 Grand Prix GT, and when I push the gas pedal to go up a hill it doesn't want to accelerate. I took it to Auto Zone and they told me it was a misfire, so we replaced the spark plugs and now it's worse... Can't even drive it.

26th May 2008, 15:59

What kind of spark plugs did you use? Bosch and GM don't mix. If you did use Bosch spark plugs, you should replace them with AC Delco plugs.

Also one of your coil packs could be bad, and you should change the wires with the plugs. They could also be bad.

3rd Jul 2008, 18:50

I am getting a 96 Olds Cutlass Supreme SL. The engine will be swapped out with the 3.1L 00 Pontiac Grand Prix engine that has only 20K miles on it.

Are components such as the Transmission and P/C Selenoid located on the engine or are they separate?

I really want this car, and the mechanic is willing to do a deal with me but he has to put in a new engine, and the Pontiac engine is what he has.

Would appreciate a reply. Please e-mail kwodem@gmail.com.

15th Aug 2008, 12:29

If you are having the typical problem of hard-shifting accompanied by a "whining" noise (which sometimes goes away if you shut the car off for a moment) the problem is most likely the Pressure Control Solenoid Valve. This is often confirmed by codes 1811 or 0748 (service engine soon light).

I have read that there is a GM dealer service bulletin number 00-07-30-002B about this from 2002. There could be other bulletins out by now. If your dealer can't figure the problem out, have them check that bulletin.

I have also read that there is a PCM update (basically the car's computer) that came out around January of 2007 that MAY also help this problem. Check that out as well. Some dealerships seem oblivious to it, and you may have to get them a phone number of someone to call at GM for it. I am sure they would rather sell you the $1500 plus fix though.

My Grand Prix developed the shifting problem around 75k miles. That seems to be the typical point for it to start happening. It was intermittent at first, but is becoming the norm now. Time to get it fixed. I wish I had one of the previous posters mechanic: $175 to replace the pressure solenoid?? I haven't got a quote for less than $600 yet... The really bad part is, from what I have read, it may happen again after getting it fixed.

To anyone considering purchasing a 1999-2002 Grand Prix... Do not do it. Do the research. There are a lot of problems that crop up around the 70-80k point. Intake manifold leaks (upper and lower) are another expensive weak point on this car.