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2021 2500hd trans problem?

Daler442
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Daler442 New Member

Daler442

Posted
Posted (edited)

New to the site, have a 2021 2500hd  with 6.6 gas. Yesterday was turning around in my driveway and heard a bang, then check engine light,  trac light,  reduced engine power,  service parking brake  lights all came on. I can run through the gear shift, but it won't engage any gears. When I have it in r or d if I touch the gas it revs up and speedo keeps going up. Looked at shift linkage and it does move, so I'm guessing a serious internal trans issue?? Anyone else have an issue like this? Thank you , 

Update, just pulled code p215b , output shaft speed correlation 

Edited by Daler442
sheath Enthusiast

sheath

Posted
Posted

Sounds like a transfer case issue.  May have somehow become engaged in 4wd before or during the turning maneuver.

Daler442 New Member

Daler442

Posted
  • Author
Posted

It was in 4wd already,  had been for 30 to 40 minutes.  Wasn't horsing it. I let it shift to drive, was taking it easy. Just don't get it

sheath Enthusiast

sheath

Posted
Posted

Sounds like it will need to go to the dealer.   I'd discuss the details with your service advisor.  She/He may be able to shed more light on the issue.

Another JR Senior Enthusiast

Another JR

Posted
Posted

I agree. Sounds like you broke something in the 4wd system rather than the transmission due to making repeated tight turns in 4wd in a high tire traction condition. Unfortunately it’s not really built for that. 

  • 1 year later...
Another JR Senior Enthusiast

Another JR

Posted
Posted
20 hours ago, Chade85 said:

What was the issue? Was it covered under warranty?

The OP hasn’t visited the site since March of 2022. If you quote him and re-ask the question he should get an email that you quoted him. 

  • 3 months later...
yucca New Member

yucca

Posted
Posted
On 3/13/2022 at 11:16 AM, Daler442 said:

New to the site, have a 2021 2500hd  with 6.6 gas. Yesterday was turning around in my driveway and heard a bang, then check engine light,  trac light,  reduced engine power,  service parking brake  lights all came on. I can run through the gear shift, but it won't engage any gears. When I have it in r or d if I touch the gas it revs up and speedo keeps going up. Looked at shift linkage and it does move, so I'm guessing a serious internal trans issue?? Anyone else have an issue like this? Thank you , 

Update, just pulled code p215b , output shaft speed correlation  ---- was it the trans mine did samething in 2 wheel drive . thanks

 

  • 1 month later...
Mike Heminger New Member

Mike Heminger

Posted
Posted

I have a 2020 Silverado 2500 HD with the same problem, heard a clunking sound, trac control light came in, park brake light, won't move forward or backwards, show p215b code, revs up when put in drive or reverse, anyone have this happen and what was the problem, how do I repair it?

Pryme Senior Enthusiast

Pryme

Posted
Posted
On 3/5/2024 at 3:08 PM, Mike Heminger said:

I have a 2020 Silverado 2500 HD with the same problem, heard a clunking sound, trac control light came in, park brake light, won't move forward or backwards, show p215b code, revs up when put in drive or reverse, anyone have this happen and what was the problem, how do I repair it?

Were you also in 4wd on dry pavement like the op? Something gave out in the transfer case is my bet

  • 4 weeks later...
MRanderson New Member

MRanderson

Posted
Posted

Just got my 2021 Chevy 2500HD out of the dealership for this problem.  Snapped the transmission output shaft off.  Right where GM welded the speed sensor ring to output shaft.  Service advisor has seen several of these come in, breaks right at the weld.  Fortunately it was covered under extended warranty as the replacement transmission, labor, new cooler lines, and a couple minor other things was just shy of $9k repair bill.  

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