GMC / Sierra 2500 / 2020
2020 GMC Sierra 2500 problems
Owners have filed 114 complaints about the 2020 GMC Sierra 2500 with NHTSA. Power train accounts for 21.1% of them, the clear leader, ahead of electrical system at 11.4%.
Complaints114
Crashes1
Fires7
Injuries1
Deaths0
What owners report breaking
Power train 21.1% · 24
Unknown or other 14.9% · 17
Electrical system 11.4% · 13
Service brakes 10.5% · 12
Engine 8.8% · 10
Steering 5.3% · 6
Structure 5.3% · 6
Forward collision avoidance 4.4% · 5
Severity
Of those complaints, 1 describe a crash, 7 describe a fire and 1 report an injury.
Reading the numbers
Across the 8 model years of the GMC Sierra 2500 in this data, 2020 draws comparatively few complaints; 2003 is the outlier year.
Filings are rising, 68 in the last three years against 32 in the three before. For a vehicle this age that usually points to a wear-related failure owners are hitting now.
The median odometer reading at the time of complaint was 25,400 miles.
In owners' own words
A dealer "fixed" the P20EE code on this date, then the code came back a week later. Same dealer said they don't have qualified diesel technician, took vehicle to a 2nd dealer 9/22/2025, unable to determine cause of code. On 6/18/2026 same P20EE code came on again, took to dealer, dealer able to perform repairs on 7/30/2026 after ordering the correct parts. No on 9/23/2026 P20EE code is back. Power train
After the transmission recall was completed, Iâm now having erratic shifting. Having the recall adding software monitoring for a hardware issue is inadequate. Now that I am out of warrentee, gm has not resolved the issue and now I am having shifting problems. Power train
A couple times I heard loud clanking coming from rear brakes. One time in particular I was trying to stop and it felt line someone had ran into my truck but must have been the rear wheel locking up Power train
Verbatim from NHTSA filings. Complaints are unverified owner reports.
Safety recalls
Checking NHTSA for open recalls…