Evangfeller
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- Feb 14, 2024
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Hello, please help. lol. I am new to the forum and I own a 2016 Yukon Denali with the 6.2 engine. 124k miles.
My issues started out relatively small it seemed, I had the unfortunately typical hard shifting and delayed shifting going on (mostly into second gear). Engine light comes on. I take it in to the gm dealership and of course have keep it for 2 full days for diagnostics before telling me it’s a bad trans temp harness, code p0711, $1200 quote. Worth noting that this was the only code showing on the initial scan, no other codes were brought to my attention by the dealer or previously at autozone when I got a free scan. Not really being sure of my options, and not wanting to do further damage, I just had them do it because I saw this was also common on higher mileage Yukons. They installed a new harness, filter, and fluid. Side note, at this time I was unaware of the special exemption N192291660, and of course they didn’t say a word about it (I realize I’m about 4k miles outside of the coverage unfortunately). The special exemption calls for 1 hour for time, they quoted me $493 for labor lol. Anyway, I pick up the vehicle and this is where I need help.
I drive home from the dealership after picking up the vehicle, drop a few things off, and then I go fill up the gas tank on the way to work (always only used 93 octane as long as I’ve owned). For this particular day at work I had to drive around 200 miles to the job site. The first 150 miles are smooth, no issues. Then I hit an exit to get a drink and relieve myself. Come back and start it up, and I noticed at first it sounded different. Take back off down the road, and about a mile into driving the car starts shaking pretty badly and accelerating poorly. I hit some stand still traffic and the car is shaking like crazy in drive but not moving. Put it in park, same shaking. Accelerating occasionally to keep up with traffic and it’s sputtering and shuffling hard. Get passed the traffic and try to get up to speed and then it went into “limp mode” basically. Showing “reduce engine power” on the dash. Fantastic feeling to have on the way to work, 150 miles from home. Literally picked it up 2 hours ago. Thanks GM!
So I spent today working out a tow, of course the dealership denying responsibility for now until they can look into it. It arrived at the shop finally tonight and my rep was able to pull the initial codes and of course it’s not showing anything about the trans they just serviced. The new codes are attached in the picture below, I had a heart attack when I saw all of those. Something sketchy is going on here, maybe I’m overreacting, maybe I’m just very unlucky, but I know a little bit about cars and this ain’t sitting right with me. I’m stumped. I took it in initially for one engine code for the trans temp harness (p0711), and now I got several codes 2 hours after it being in their possession.
Obviously most concerned about that misfire code. Never want to see those especially in the 6.2. At no point during my situation I explained above did my engine light blink at me (indicating misfire). However my rep said that when the car arrived at the shop and he turned it on for codes, it was flashing for him. Interesting yet again.
Anybody have any clue what might have happened? Anybody have something similar happen? Does anyone know if the initial repair they did has any correlation to these new issues? Thanks for taking the time to read and help me out!
-Evan
p.s. please reply asap if you know anything. I want to have some knowledge on this before they call me with their version of the diagnosis.
My issues started out relatively small it seemed, I had the unfortunately typical hard shifting and delayed shifting going on (mostly into second gear). Engine light comes on. I take it in to the gm dealership and of course have keep it for 2 full days for diagnostics before telling me it’s a bad trans temp harness, code p0711, $1200 quote. Worth noting that this was the only code showing on the initial scan, no other codes were brought to my attention by the dealer or previously at autozone when I got a free scan. Not really being sure of my options, and not wanting to do further damage, I just had them do it because I saw this was also common on higher mileage Yukons. They installed a new harness, filter, and fluid. Side note, at this time I was unaware of the special exemption N192291660, and of course they didn’t say a word about it (I realize I’m about 4k miles outside of the coverage unfortunately). The special exemption calls for 1 hour for time, they quoted me $493 for labor lol. Anyway, I pick up the vehicle and this is where I need help.
I drive home from the dealership after picking up the vehicle, drop a few things off, and then I go fill up the gas tank on the way to work (always only used 93 octane as long as I’ve owned). For this particular day at work I had to drive around 200 miles to the job site. The first 150 miles are smooth, no issues. Then I hit an exit to get a drink and relieve myself. Come back and start it up, and I noticed at first it sounded different. Take back off down the road, and about a mile into driving the car starts shaking pretty badly and accelerating poorly. I hit some stand still traffic and the car is shaking like crazy in drive but not moving. Put it in park, same shaking. Accelerating occasionally to keep up with traffic and it’s sputtering and shuffling hard. Get passed the traffic and try to get up to speed and then it went into “limp mode” basically. Showing “reduce engine power” on the dash. Fantastic feeling to have on the way to work, 150 miles from home. Literally picked it up 2 hours ago. Thanks GM!
So I spent today working out a tow, of course the dealership denying responsibility for now until they can look into it. It arrived at the shop finally tonight and my rep was able to pull the initial codes and of course it’s not showing anything about the trans they just serviced. The new codes are attached in the picture below, I had a heart attack when I saw all of those. Something sketchy is going on here, maybe I’m overreacting, maybe I’m just very unlucky, but I know a little bit about cars and this ain’t sitting right with me. I’m stumped. I took it in initially for one engine code for the trans temp harness (p0711), and now I got several codes 2 hours after it being in their possession.
Obviously most concerned about that misfire code. Never want to see those especially in the 6.2. At no point during my situation I explained above did my engine light blink at me (indicating misfire). However my rep said that when the car arrived at the shop and he turned it on for codes, it was flashing for him. Interesting yet again.
Anybody have any clue what might have happened? Anybody have something similar happen? Does anyone know if the initial repair they did has any correlation to these new issues? Thanks for taking the time to read and help me out!
-Evan
p.s. please reply asap if you know anything. I want to have some knowledge on this before they call me with their version of the diagnosis.
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