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Feb 12th, 2024
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 Check Engine Light....
#7895110
07/09/20 04:24 AM
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Joined: Dec 2010
Posts: 8,841
DocHorton
OP
THF Trophy Hunter
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OP
THF Trophy Hunter
Joined: Dec 2010
Posts: 8,841 |
Wife's Tahoe had a check engine light come on today....code is P0303, cylinder 3 misfire. Smells like gas and motor seems to be lurching when on and idling, she also said she noticed some smoke when driving and the vehicle was shaking a little with reduced power. Any auto experts have any idea what this means or possible cause/repair? It's a 2018, 43k miles.
Thanks for the help.
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Re: Check Engine Light....
[Re: DocHorton]
#7895113
07/09/20 04:30 AM
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Joined: Aug 2012
Posts: 2,776
nak
Veteran Tracker
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Veteran Tracker
Joined: Aug 2012
Posts: 2,776 |
Fouled plug, injector, coil pack
We all need to practice Whoa more.
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Re: Check Engine Light....
[Re: DocHorton]
#7895114
07/09/20 04:30 AM
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Joined: Nov 2011
Posts: 16,797
S.A. hunter
THF Celebrity
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THF Celebrity
Joined: Nov 2011
Posts: 16,797 |
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Re: Check Engine Light....
[Re: DocHorton]
#7895119
07/09/20 04:48 AM
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Joined: Mar 2018
Posts: 1,158
Scott W
Pro Tracker
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Pro Tracker
Joined: Mar 2018
Posts: 1,158 |
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Re: Check Engine Light....
[Re: nak]
#7895121
07/09/20 04:55 AM
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Joined: Nov 2011
Posts: 9,907
unclebubba
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2011
Posts: 9,907 |
Fouled plug, injector, coil pack If over 100000 miles, and plugs have been changed already, my first suspect would be coils. As you have only 43 k, pull the coil and see if there is any water down in the plug reservoir. Water could be coming from washing the engine, or from rain leaking to where it isn't supposed to go, or coolant leak.
Last edited by unclebubba; 07/09/20 04:58 AM.
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Re: Check Engine Light....
[Re: DocHorton]
#7895122
07/09/20 04:57 AM
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Joined: Dec 2010
Posts: 8,841
DocHorton
OP
THF Trophy Hunter
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OP
THF Trophy Hunter
Joined: Dec 2010
Posts: 8,841 |
Thanks guys, looks like it "should" be an easy fix. Appreciate it.
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Re: Check Engine Light....
[Re: DocHorton]
#7895163
07/09/20 11:53 AM
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Joined: Aug 2008
Posts: 14,949
don k
THF Celebrity
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THF Celebrity
Joined: Aug 2008
Posts: 14,949 |
You got any mice in the garage?
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Re: Check Engine Light....
[Re: don k]
#7895167
07/09/20 11:56 AM
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Joined: Oct 2007
Posts: 19,241
TEXASLEFTY
THF Whiskey Sommelier
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THF Whiskey Sommelier
Joined: Oct 2007
Posts: 19,241 |
You got any mice in the garage? Ohm the wires to the coil while your there. I’d replace the #3 coil and all the plugs. PM me if you want help.
Never been to a camping world. I prefer Dick's to be honest.
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Re: Check Engine Light....
[Re: DocHorton]
#7895315
07/09/20 02:33 PM
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Joined: Jul 2007
Posts: 35,118
Brother in-law
THF Celebrity
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THF Celebrity
Joined: Jul 2007
Posts: 35,118 |
Our Tahoe’s at work go in the shop all the time for similar issues. They never get right
Last edited by Brother in-law; 07/09/20 02:38 PM.
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Re: Check Engine Light....
[Re: DocHorton]
#7895339
07/09/20 02:45 PM
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Joined: Mar 2007
Posts: 5,225
Rustler
THF Trophy Hunter
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THF Trophy Hunter
Joined: Mar 2007
Posts: 5,225 |
With that few miles it shouldn't have any ignition system problems, unless rodent damage.
Of course you can't rule out anything until it is checked.
The 5.3 has a long history of developing vacuum leaks, with the code signifying #3 I do a thorough job of leak detection on the intake manifold around #3.
The 6.2 has issues with the cylinder deactivation going wonky, usually starts with one cylinder, if ignored gets worse.
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Re: Check Engine Light....
[Re: DocHorton]
#7895350
07/09/20 02:50 PM
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Joined: Oct 2004
Posts: 39,535
redchevy
THF Celebrity
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THF Celebrity
Joined: Oct 2004
Posts: 39,535 |
A 2018 with 43K miles, its under factory warranty no? Take it to the big house and don't take it back till its right.
It's hell eatin em live
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Re: Check Engine Light....
[Re: DocHorton]
#7895363
07/09/20 03:02 PM
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Joined: Oct 2008
Posts: 16,733
68rustbucket
THF Celebrity
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THF Celebrity
Joined: Oct 2008
Posts: 16,733 |
Trade it in for a new one.
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Re: Check Engine Light....
[Re: redchevy]
#7895364
07/09/20 03:02 PM
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Joined: Nov 2009
Posts: 91,416
bill oxner
THF Celebrity
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THF Celebrity
Joined: Nov 2009
Posts: 91,416 |
A 2018 with 43K miles, its under factory warranty no? Take it to the big house and don't take it back till its right. Nailed it.
Quail hunting is like walking into, and out of a beautiful painting all day long. Gene Hill ![[Linked Image]](https://texashuntingforum.com/forum/pics/usergals/2017/07/full-3669-105539-full_16668_105507_image.jpg)
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Re: Check Engine Light....
[Re: DocHorton]
#7895386
07/09/20 03:16 PM
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Joined: Aug 2005
Posts: 17,117
MikeC
THF Celebrity
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THF Celebrity
Joined: Aug 2005
Posts: 17,117 |
Trade it in on a non GM product!
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Re: Check Engine Light....
[Re: redchevy]
#7895387
07/09/20 03:17 PM
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Joined: Mar 2007
Posts: 5,225
Rustler
THF Trophy Hunter
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THF Trophy Hunter
Joined: Mar 2007
Posts: 5,225 |
A 2018 with 43K miles, its under factory warranty no? Take it to the big house and don't take it back till its right. I doubt it still has warranty 3yr / 36,000 miles. The limited powertrain 5/60,000 covers the parts for limited items related to the powertrain. Misfire due to ignition system, rodent damage, faulty wiring wouldn't be covered. Intake manifold gasket and faults in the powertrain control system ( ECU, PCM, BCM etc..) would be. Of course some dealers take really good care of good customers, probably worth a call.
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Re: Check Engine Light....
[Re: DocHorton]
#7895391
07/09/20 03:24 PM
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Joined: Apr 2009
Posts: 6,107
pdr55
THF Trophy Hunter
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THF Trophy Hunter
Joined: Apr 2009
Posts: 6,107 |
Seafoam fixes everything...
If you`re running down my country, man,
You`re walking on the fighting side of me. (Merle)
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Re: Check Engine Light....
[Re: MikeC]
#7895397
07/09/20 03:31 PM
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Joined: Jan 2011
Posts: 65,517
SnakeWrangler
THF Celebrity
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THF Celebrity
Joined: Jan 2011
Posts: 65,517 |
Trade it in on a non GM product! This^^^^^my work pickup is a 2020 2500 pickup....40,400 miles on it...fan motor for the ac/heat/defrost went out. Warranty went out at 36k.....dealership wanted $720 to repair....
I believe in science and I’m an insufferable [censored] Actually, BBC is pretty damn good "You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
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Re: Check Engine Light....
[Re: Rustler]
#7895398
07/09/20 03:31 PM
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Joined: Oct 2004
Posts: 39,535
redchevy
THF Celebrity
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THF Celebrity
Joined: Oct 2004
Posts: 39,535 |
A 2018 with 43K miles, its under factory warranty no? Take it to the big house and don't take it back till its right. I doubt it still has warranty 3yr / 36,000 miles. The limited powertrain 5/60,000 covers the parts for limited items related to the powertrain. Misfire due to ignition system, rodent damage, faulty wiring wouldn't be covered. Intake manifold gasket and faults in the powertrain control system ( ECU, PCM, BCM etc..) would be. Of course some dealers take really good care of good customers, probably worth a call. If it was caused by abuse neglect or a rodent then sure they probably wont cover it. Its under powertrain warranty id take it in and let them tell me why it wont work.
It's hell eatin em live
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Re: Check Engine Light....
[Re: DocHorton]
#7895525
07/09/20 05:05 PM
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Joined: Oct 2008
Posts: 16,733
68rustbucket
THF Celebrity
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THF Celebrity
Joined: Oct 2008
Posts: 16,733 |
Insurance would probably pay for rodent damage.
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Re: Check Engine Light....
[Re: DocHorton]
#7895538
07/09/20 05:13 PM
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Joined: Oct 2007
Posts: 19,241
TEXASLEFTY
THF Whiskey Sommelier
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THF Whiskey Sommelier
Joined: Oct 2007
Posts: 19,241 |
I misread the OP at 43k a coil would be my first guess.
That’s pretty low mileage for an intake gasket, not saying it’s impossible though
Never been to a camping world. I prefer Dick's to be honest.
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Re: Check Engine Light....
[Re: 68rustbucket]
#7895544
07/09/20 05:16 PM
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Joined: Nov 2009
Posts: 91,416
bill oxner
THF Celebrity
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THF Celebrity
Joined: Nov 2009
Posts: 91,416 |
Insurance would probably pay for rodent damage. Yep. Squirrel got after a neighbors car. Insurance paid.
Quail hunting is like walking into, and out of a beautiful painting all day long. Gene Hill
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Re: Check Engine Light....
[Re: Rustler]
#7895624
07/09/20 06:08 PM
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Joined: Jul 2008
Posts: 6,439
Chopped54
THF Trophy Hunter
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THF Trophy Hunter
Joined: Jul 2008
Posts: 6,439 |
With that few miles it shouldn't have any ignition system problems, unless rodent damage.
Of course you can't rule out anything until it is checked.
The 5.3 has a long history of developing vacuum leaks, with the code signifying #3 I do a thorough job of leak detection on the intake manifold around #3.
The 6.2 has issues with the cylinder deactivation going wonky, usually starts with one cylinder, if ignored gets worse.
Not sure on the 2018 models, but the 5.3 with DOD also has issues with stuck lifters, same symptoms described.
Wealth is of the heart and mind and not of the pocket
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Re: Check Engine Light....
[Re: DocHorton]
#7895632
07/09/20 06:16 PM
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Joined: Aug 2012
Posts: 15,564
TexFlip
THF Celebrity
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THF Celebrity
Joined: Aug 2012
Posts: 15,564 |
Like Eazy-E says...."throw it in the gutter and go buy another".
Just to make sure that it is done thoroughly, I go both ways.
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Re: Check Engine Light....
[Re: DocHorton]
#7895655
07/09/20 06:39 PM
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Joined: Apr 2011
Posts: 8,069
Cool Mo D
THF Trophy Hunter
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THF Trophy Hunter
Joined: Apr 2011
Posts: 8,069 |
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Re: Check Engine Light....
[Re: DocHorton]
#7895685
07/09/20 06:56 PM
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Joined: Mar 2008
Posts: 2,143
sweetwood
Veteran Tracker
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Veteran Tracker
Joined: Mar 2008
Posts: 2,143 |
Swap that coil with one on a different cylinder and see if the problem follows. I just went through this and it wound up being an injector but this was the easiest way for me to diagnose and rule out issues without throwing parts at it.
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