why does my 1999 pontiac grand prix loss all power when the tempature light comes on

Felicia Kelley

Asked by Jul 06, 2013 at 09:02 AM about the 1999 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

i have replaced the EGR valve, thermastat, thermastat censor, water pump, low coolant censor.. My car is NOT running hot but when driving as soon as the tempature light comes on the car losses all power.

2 Answers


Check your battery connections. A loose or dirty connection can also cause this type of issue.


Found this thread on another site. Might be same issue as yours ---My 1999 Grand Prix has been acting up with all the same symptoms many people described. Engine cut out at highway or low speed; hard to start after a hot shut down; the Trac light stayed on after the engine cut out and immediate restart in neutral etc. It was getting worse lately with the hot weather. I contemplated replacing the crank position sensor, mass air flow sensor, PCM one at a time, and hundreds of $ at a time, like many people before me. Then, I found the way to fix my problem at ZERO DOLLAR! I figured that it could be a voltage problem. I used a multi-meter. I measured the voltage across my battery, which show the normal 12.7 V. But from the positive terminal junction to a good ground on the engine (e.g. Al engine mount) the voltage has dropped down. I also measure the conductivity as well, and I did not get zero Ohm between the negative terminal to the good ground spot on the engine. I removed the grounding cable attached to the body panel and found that it was bolted on to a part with original body paint! What a bad design! Paint is not the best conductor in the world! After years of dirt and rust build-up, the conduction between the bolt threads won't be as good as before. So you get intermittent voltage drops that stalled the engine. I gave the contact a good rubbing with sand paper. I check voltage and conductivity after and it was good as you would expect. Since than, I never had a single staling. It has been three weeks with lots of kilometers in hot weather. I trust that the same remedy will solve a lot of your problems. I apologize to many garages for reducing tens of thousands of dollars of their potential business.

Your Answer

Add photo

Related Questions

  • Engine power loss and sputtering 43 answers

    It seems like I have a loss of power when accelerating and driving around 50-60 mph at ~2k rpm. The car also sputters and rpm begins to fluctuate while driving. Is the fuel injector bad or clogged and...

    1995 Pontiac Grand Prix 2 Dr SE Coupe


    Maintenance & Repair

  • Reduced engine power on a 2008 Grand Prix 74 answers

    I have a 2008 Grand Prix, that worked great until last march when i put it in the ditch. it got all fixed from that. But just this past week i was driving it and it came up with REDUCED ENGINE POWER...

    2008 Pontiac Grand Prix Base


    Maintenance & Repair

  • 2004 Pontiac Grand Prix Ask me any questions 33 answers

    I have totally replaced and rebuilt this car. I have experienced some major obstacles and solved them. I have experience with this year model Grand Prix. I may be of some help to others.

    2004 Pontiac Grand Prix GTP


    Maintenance & Repair

  • Troubleshooting a 2007 Pontiac Grand Prix 11 answers

    I have a 2007 Pontiac Grand Prix with an oily/water mixture dripping from my exhaust pipe. My car goes to about a 1/2 quart low on oil approximately once/month but I dont have any obvious oil leaks or...

    2007 Pontiac Grand Prix Base


    Maintenance & Repair

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Reputation 3,670
#2 Tom Demyan
Tom Demyan
Reputation 2,450
#3 munron
Reputation 1,950
View All

Related Models For Sale

Used Chevrolet Impala"
893 Great Deals out of 35,537 listings starting at $795
Used Pontiac Bonneville"
863 listings starting at $2,995
Used Chevrolet Monte Carlo"
7 Great Deals out of 2,061 listings starting at $3,850
Used Pontiac Grand Am"
1,968 listings starting at $1,995
Used Chevrolet Malibu"
1,104 Great Deals out of 72,184 listings starting at $1,300
Used Chevrolet Camaro"
812 Great Deals out of 39,041 listings starting at $2,650
Used Ford Mustang"
725 Great Deals out of 41,221 listings starting at $900
Used Nissan Altima"
1,404 Great Deals out of 87,430 listings starting at $1,195
Used Nissan Maxima"
448 Great Deals out of 23,905 listings starting at $1,500

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
17 Great Deals out of 546 listings starting at $2,495
2007 Pontiac Grand Prix For Sale
594 listings starting at $5,500
2006 Pontiac Grand Prix For Sale
5 Great Deals out of 784 listings starting at $2,950
2005 Pontiac Grand Prix For Sale
5 Great Deals out of 502 listings starting at $1,995