really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
116,073 miles

About These NHTSA Complaints:

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.

2006 GMC Sierra 1500 engine problems

engine problem

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2006 GMC Sierra 1500 Owner Comments

problem #5

Mar 212016

Sierra 1500

  • 143,000 miles


Defective castech heads. Leaking antifreeze into engine. Thins out the engine oil and could engine to over heat or sieze up while driving. GM knows of the defective heads but will not warrenty them. Please can someone please help us poor people who have got stuck with this bad defective design.

- Scotia, NY, USA

problem #4

Jan 192016

Sierra 1500

  • 167,000 miles
I have a 2006 GMC Sierra with the 5.3L vortec engine and I found out that the castech heads are faulty and leaking coolant into the engine also found out this is a common issue and GM knows about it, technical service bulletin is 06-06-01-019B which states GM is aware of the defect this truck was bought by my boss brand new and I purchased it from him I believe GM should take care of this for my family's safety. Just noticed this this month and this truck has been serviced regularly.

- Midland, TX, USA

problem #3

Mar 122015

Sierra 1500

  • 82,000 miles
2006 GMC Sierra quit running on a trip we were taking. It started missing and eventually wouldn't restart. The truck has 82K on it and is very well maintained. The engine would turn over but not start... no spark? it has been to various service mechanics as well as my attempt to figure out what is wrong with it. Many new parts have been used: Icm, crank sensor, cam sensor, coil... no difference. This vehicle quitting on a very busy highway could have caused significant injury to myself and/or my passenger. When the truck was new it had an intermittent miss and while still under warranty I returned to the dealer. There they were unable to find anything that would cause the problem. This same miss was periodically present up until the time it quit running altogether.

- New Hope, KY, USA

problem #2

May 142015

Sierra 1500

  • 150,000 miles
The contact owns a 2006 GMC Sierra 1500. The contact stated that the check engine warning light illuminated and the vehicle decelerated to less than 10 mph. The contact also stated that the air bag warning light continuously illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failures. The failure mileage was 150,000.

- Covington, GA, USA

problem #1

Jun 222014

Sierra 1500 8-cyl

  • 38,367 miles
We were in a storage facility parking our camper when I got out of my GMC truck...I left it running in park because it was so hot outside...while I directed my brother to put the camper in place with his vehicle. This took approx. 20-30 minutes when all of a sudden my truck is going in reverse all on its own running into some boats that were stored there. Wth!! my truck got rear end damage, bumper damage, light broken and my topper was messed up as well....along with the boat trailers that it hit! was there any recall with this problem? I bought this truck about 2 years ago with only 29,000 miles on it and it still only has 38,000.

- Metairie, LA, USA

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