This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.
So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.
The vehicle will not shift properly when towing a trailer. While going up a hill, the transmission will not downshift properly. While going downhill, the vehicle downshifts to 2nd gear while going 60 mph. I have contacted GM several times (they have it on file) that there is a problem with the transmission. They understand but said that they cannot do anything about it. This has been happening since it was brand new. Over and over again.
While pulling my fifth wheel trailer 12500# at highway speed 65 mph pulling a grade the check engine light came on and the reduced engine power message appeared on the dash. This reduced and limited the speed to 50 mph and steps the truck down from there until you can only do 20 mph on the interstate. This issue has happened three times in three months.
- Wyoming , NY, USA
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- Hannacroix, NY, USA