Question about 1997 GMC Jimmy

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P0306 - 1997 GMC Jimmy

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  • Anonymous Feb 01, 2009


    1. i have the same problem on my 1998 gmc z71 code 306 miss fire on #6 cylinder. changed plug, wire,cap,rotor, still comes on. what else can it be

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Its your No. 6 Injector. I had the same problem on my 97 Jimmy. Replaced the SPYDER injectors and it runs fine now.

Posted on Feb 25, 2009

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HAD THE SAME PROBLEM WITH MY SON 94 MUSTANG, IT STARTED WITH A CODE OF P0340 AND P0306. HE ALSO HAD JUMPING INSTRUMENT GUAGES AND ENGINE RUNNING ROUGH. STARTED THE NORMAL TROUBLE SHOOTING. REPLACE THE CAM SHAFT SENSOR WHICH FIX THE P0340 CODE BUT NOT THE P0306, THEN THE FUEL RELAY CONTROL BOX WENT BAD. THE FUEL PUMP WOULD NOT PUMP, REPLACE THE RELAY BOX, FUEL PUMP STARTED TO WORK BUT MAKING A CLICKING NOISE ALONG WITH THE GUAGES JUMPING. I STARTED TO THINK THERE IS A BAD GROUND ON THE CAR, I REPLACED THE ENGINE GROUND CABLE AND THE CAR FRAME GROUND. FIX THE GUAGE PROBLEM AND THE CLICKING SOUND IN THE RELAY BOX BUT NOT THE P0306. WILL NOW I THINKING THAT I FRIED THE EEC COMPUTER WITHOUT A GOOD GROUND FROM THE PAST PROBLEM, I REPLACED THE COMPUTER BOX AND THE PROBLEM WAS FIX. NO MORE P0306 AND THE ENGINE RUNS GREAT. MY CONCLUSION:::: MY LOST OF A GOOD GROUND BETWEEN THE ENGINE GOUND AND CAR FRAME CAUSE THE RELAY BOX, CAR COMPUTER, AND THE CAM SENSOR TO GO BAD LOOKING FOR A GROUND!!!!!!.

Posted on Feb 24, 2013

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P0306 Cylinder 6 Misfire Detected

Check cylinder six - take a look at the plug to see if it looks OK, inspect the spark plug wire, first to be sure it's fully connected, and second, look inside the boots to be sure there are no burn marks that would indicate that it is arcing. I'd change the plug just because you're taking it out - a new one is only a few bucks, so it doesn't make a lot of sense to put an old one back into a misfiring cylinder. If that shows nothing, you may have a problem with the distributor, cap, or coil pack.

Posted on Jul 29, 2008

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1 Answer

Code p0306 mean


Bob, P0306 code means that the the vehicle's computer has detected engine's cylinder #6 is not firing properly. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.obd-codes.com/p0306
P0306 OBD II Trouble Code Cylinder 6 Misfire Detected

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2000 maxima code P0306


P0306 is a #6 cylinder misfire. Did u replace the plugs yet?? at 105K miles?? that's the interval for plugs, but the plugs are pretty resilient in those. the will go way beyond 105K. You may need a coil replaced. if u haven't replaced plugs yet, start with those. if u have, replace coil.

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What 's for DTC=p0306 in 2000 SONOMA 4.3L extended cab as a solution.


P0306 is a generic code for Cylinder 6 misfire.Check spark plug and wire.

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1 Answer

P0306 and P0316


Okay, you were getting code P0306, and a P0316. You have replaced plugs and swapped coils around are you still getting the code P0306? or is it a different code for a different cylinder now? Replacing your crankshaft position sensor in this case will merely waste your money. Its doing its job, the P0316 is telling you you had a misfire in the first 1000 revolutions of your engine at startup, the P0306 is telling you its probably cylinder #6 that had the problem. there is no code there indicating your CKP is bad.

Now if you swapped your coils and the misfire is still on cylinder 6, its either injector problem, or base engine. If the misfire has moved to another cylinder, replace that COP.

Hope helps.

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I have a 2004 chrysler concorde. i got three code readings does anyone know what they are? they are p0700, p0871 and p0306


P0306 indicates misfire #6 cylinder detected
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P0871 indicates a problem with the transmission overdrive

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1 Answer

P0306 code


Misfiring on #6 cylinder. A code P0306 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

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P0134 /P0306 Codes on Chevy Truck 1998


in AKO look under Self Help> My Library > Fix Your Car > then go to Chiltons or ARRC link from there.

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