I have a 2003 Grand Prix it would turn but it will not start

Asked by Aug 20, 2015 at 08:21 AM

Question type: Maintenance & Repair

I changed the thermostat

3 Answers


Make sure you have a good 12 volts at the battery, check all the connections at the battery as well. I would also clean the throttle body good with a throttle body cleaner...


Check the wiring going to the ignition control module. If this is a GT model with the 3.8 L V6 that wiring harness needed to be moved to change the thermostat. Make sure none of the wires got unplugged, damaged, or wet during the repair. HTH. -Jim


There should be 2 wires that are near where you may have be working that go down the back of the engine from the ignition module... the go to the crank sensor ... if they got unplugged that may be your problem good luck

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions


Looking for a Used GMC in your area?

CarGurus has 216,427 nationwide GMC listings starting at $1,488.


Search GMC Questions

GMC Experts

#1 dragonflyoffshore
Reputation 5,260
#2 John Saffrahn
John Saffrahn
Reputation 4,490
#3 Richard Schroer
Richard Schroer
Reputation 4,460
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.