Two problems related to check engine light on have been reported for the 2011 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 GMC Sierra 1500 based on all problems reported for the 2011 Sierra 1500.
While driving on highway check engine light came on and lost power. Also started to hear tapping coming from engine. Had it checked by mechanic. Found code p0306 cylinder 6 misfire. Checked gm truck web site and noted service bulletin noting valve lifter failure, but no recall. Bulletin states that lifter can fail causing misfire and taping in motor. Also states during repair to check cam shaft for scoring & damage. Also checked several gm & chevy car form websites, and noted multiple complaints about same issues as well as several near accidents because of loss of power while driving. There are also several youtube videos of issues with this motor and valve lifter failure. This happens because cylinders shut down during cruising. Lifters that fail have a spring attached that fails causing the misfire and scoring to cam shaft. Gm is aware of issue but fails to issues a recall for repairs to this motor. This is a hazard and could cause an accident. Repairs should also be covered by gm as this is a common problem with this motor and they are aware of it with their in house service bulletin to service managers. This issues can happen and be covered by service warranty, but not covered when out of warranty. Bulletin also goes on to state how to write it up if covered by powertrain warranty.
Started truck up and let idle for two minutes. Upon take off, the traction control light came on and was immediately followed by the check engine light with a message stating engine reduced power. The truck then begins to run very rough and when the brakes where applied it violently and uncontrollably lunged forward. I pulled off the road, turned off the engine, and waited a minute or two. Upon restarting the engine, the check engine light came on but the reduced power message and traction light where gone. After sitting at a light for a few seconds, the symptoms where back, nearly causing me to rearend the vehicle in front of me. I pulled over again, turned off the engine for a minute, restarted and the same results as before occured. Now this happens every time the truck is running and sits in the same spot for more than two or three minutes.