P0306 code on an 01 grand prix gtp what would cause this. I have already replaced plugs and coil packs to no avail. Any ideas?


Asked by Apr 25, 2015 at 06:46 PM about the 2001 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

5 Answers


Have you replaced the spark plug wires? If not, replace them. Plugs and wires should be replaced together. If that doesn't solve the problem check for a bad fuel injector on cylinder #6 (P0306 is a misfire on cylinder #6). If that's ok compression test that cylinder. HTH. -Jim

Best Answer

Plug wires just replaced and new injector on #6 and has good compression


Wait until after dark (no joke) and start the engine. Open the hood and look for sparking at the #6 plug wire. If you see any, the plug wire is either defective or not fully seated on the spark plug. This will cause a misfire. If you can't see any sparking get a spray bottle of plain water and mist (don't saturate) all around the engine, while it's running. Be sure to mist the plug wires and coil pack areas. Again look for the sparking at #6. HTH. -Jim


Did that and no sparking


Check to see that you have spark at that individual cylinder. Also, using a noid light, see if you have a trigger signal to the injector. HTH. -Jim

Your Answer

Add photo

Related Questions

  • 97 grand prix gtp wont start 4 answers

    I have a 97 gtp that instantly died on the highway going 70 mph. The steering went tight along with the breaks being harder to press down. It had a half a tank of gas. Car has 175k miles. Ive check...

    1997 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan


    Maintenance & Repair

  • Why does it stall after it is warmed up? 11 answers

    I have a 2000 Grand Prix GTP that stalls after it warms up with no error codes. Has this happened to anybody else?

    2000 Pontiac Grand Prix GTP


    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

  • Abs, TCS and 2 codes 5 answers

    I have a 2003 grand prix gtp. I am having a problem with the abs, TCS and the check engine light flashing. The engine light is for no.4 cylinder misfire and no.4 injector. Now all this happens at ...

    2003 Pontiac Grand Prix GTP


    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 4,357 nationwide Grand Prix listings starting at $1,995.


Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Reputation 3,690
#2 Tom Demyan
Tom Demyan
Reputation 2,450
#3 munron
Reputation 1,960
View All

Related Models For Sale

Used Chevrolet Impala"
928 Great Deals out of 35,693 listings starting at $1,500
Used Pontiac Bonneville"
3 Great Deals out of 857 listings starting at $2,950
Used Pontiac Grand Am"
1,982 listings starting at $1,995
Used Chevrolet Monte Carlo"
12 Great Deals out of 2,063 listings starting at $2,000
Used Chevrolet Malibu"
1,151 Great Deals out of 73,017 listings starting at $695
Used Ford Mustang"
736 Great Deals out of 41,064 listings starting at $900
Used Chevrolet Camaro"
798 Great Deals out of 38,849 listings starting at $2,650
Used Nissan Altima"
1,351 Great Deals out of 87,430 listings starting at $1,095
Used Nissan Maxima"
494 Great Deals out of 24,220 listings starting at $1,500
Used Honda Accord"
1,262 Great Deals out of 78,683 listings starting at $1,400

Used Cars For Sale

2005 Pontiac Grand Prix GTP For Sale
54 listings starting at $3,000