Engine Misfire Due to Worn Valve Seat on GMC Canyon

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.

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Average mileage: 100,394 (28,000–221,000)
Engines affected: 2.8L 4 Cylinder, 3.5L 5 Cylinder, 3.7L 5 Cylinder
4 model years affected: 2004, 2005, 2006, 2007 more
32 people reported this problem
24 people shared problem details
2005 GMC Canyon- 3.5L 5 Cylinder75,000
My service engine soon light would come on and go off repeatedly. My truck began to idle really rough with low rpm while stopped at an intersection. I went to my local GMC Dealer and they diagnosed it as needing new cylinders and the extended 7 year 100,000 mile warranty covered everything.
5 people like thisFlag inappropiate
2006 GMC Canyon- 2.8L 4 Cylinder94,000
Poor idle, terrible gas mileage, hesistation, gmc mechanics request new cylinder head and valve job.
4 people like thisFlag inappropiate
2006 GMC Canyon- 3.5L 5 Cylinder64,000
Rough idle, Check Engine light (P0300), cylinder leak test shows #2 cylinder leaking (intake valve).
4 people like thisFlag inappropiate
2005 GMC Canyon- 3.5L 5 Cylinder106,000
Determined that the valve seats were bad and the cylinder head needs to be rebuilt at the cost of over $2000.00. It is our understanding that GM knew of this problem and didn't notfiy anyone. Also, we have been told that since we are just over the 100,000 mile limit there is no coverage.
4 people like thisFlag inappropiate
2006 GMC Canyon- 2.8L 4 Cylinder55,000
Truck sputters on idle at intersections. Was just told it will cost $4600 plus tax to repair. 7 year warranty ran out last year, of course. An engine should run more than 55000 miles. Very disappointing.
2 people like thisFlag inappropiate
2006 GMC Canyon- 3.5L 5 Cylinder156,000
CHECK ENGINE LIGHT ILLUMINATED, ENGINE MISSFIRE CODE, TRUCK IDLES POORLY, WHILE IN REVERSE IT WILL ACTUALLY DIE AT THE BOTTOM OF DECELERATION AT LOW SPEEDS
2 people like thisFlag inappropiate
2005 GMC Canyon- 3.5L 5 Cylinder165,000
I TOOK IT IN BECAUSE MY WATER PUMP WENT OUT FOR THE 2ND TIME ALSO TOLD THEM HAD THE SPARK PLUGS CHANGE AND IT STILL HAD A MISFIRE THEY TOLD ME IT WAS THE NUMBER 5 CYLINDER HEAD WAS LOOSING 80 % COMPRESSION PAID TO HAVE IT FIXED ALONG WITH MY A/C RESISTOR AND CONNECTOR WHICH WENT OUT ABOUT 50 MILES AFTER WARENTY WAS UP GET IT BACK AND IT STILL HAS A MISFIRE COME TO FIND OUT THERE WAS A RECALL ON THE VALVE SEATS AND CYLINDER HEAD BEFORE 100000 MILES MIND YOU I HAVE HAD MY TRUCK IN THE SHOP MORE THAN ONCE ON IT MISFIRING MY TRUCK IS RUNNING WORSE NOW THAN WHEN I TOOK IT IN I AM TAKING IT BACK
1 person likes thisFlag inappropiate
2006 GMC Canyon- 2.8L 4 Cylinder104,000
Check engine light on. P0301, P0300.
2005 GMC Canyon- 3.5L 5 Cylinder130,000
engine light came on. problem was misfire in #1 cylinder. can not find a used engine under 100k. not sure what iam going to do at this point.
2004 GMC Canyon- 3.5L 5 Cylinder156,000
Check engine light went on and off and went to dealer who said it was a computer glitch. Vehicle now misfires at low idle. If cost is in the thousands, I will have to find another vehicle.
2006 GMC Canyon- 2.8L 4 Cylinder
code 300 not fixed can not afford
2006 GMC Canyon- 3.5L 5 Cylinder28,000
check engine light goes on and off. mostly on now cylinder #3 and 5 misfire. I was told about the defected head
2005 GMC Canyon- 3.5L 5 Cylinder134,000
valve 2 mis-firing. had to do a valve job.
2006 GMC Canyon- 2.8L 4 Cylinder57,600
Multiple cyl. misfiring, gas mileage has depleted drastically. Most problematic gm I've ever owned, sadly disappointed!
2006 GMC Canyon- 3.5L 5 Cylinder80,000
I believe this is the problem with my 2006 canyon. I have brought the truck in at 33000 miles when check engine light came on, they replaced the emissions canister valve, computer read po 300 and po499. I brought truck to a shop when light came on again and was told to bring to a gmc dealer because test was done and he found cylinders 2 and 5 to have misfired the most. Gm service ran the computer again came up with po 300 and po 449 again. They wanted to replace the same part I replaced under warranty a few years back.Replaced the part and was right back the next morning with check engine light on. hooked to computer again and still reads po300 which is a misfire but they claim the leak down test is within the allowable range and have no idea what is causing the misfires. waiting to hear what they come up with next. I think it may be time for me to call GMC myself and start complaining.
2006 GMC Canyon- 3.5L 5 Cylinder83,254
just started waiting to find a fix
2004 GMC Canyon- 3.5L 5 Cylinder110,000
No compression in cylinder 2 & 4...will probably have to replace engine...LAST GMC I will ever own. Had oil changed every 3K miles and always babied this truck....really let down...looking at a Nissan with a more reliable V-6.
2004 GMC Canyon- 2.8L 4 Cylinder221,000
changed the spark plugs but every so often it misfires
2006 GMC Canyon- 2.8L 4 Cylinder88,000
i have been having a problem with misfire on all cylinders, just paid $300.00 to have fuel injection service done throttle body assy cleaned, code was p0300, still runs like crap. bought new in 2006
2007 GMC Canyon- 3.7L 5 Cylinder48,864
Apparently they did not fix this problem for the 2007 MY. The dealer gave me an estimate of $2,500 plus tax to fix the problem. The service manager is supposedly trying to get GM to "help" in this repair, we'll see what they come back with. The symptom is the engine runs slightly rough and I get the check engine light about 1-2 times per month.
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Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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