The Check Engine Light With Code: P0011, P0014, P0021, P0024, P0341, P0346, P0336, and/or P0391 on GMC Acadia

Vehicles with certain V6 engines may illuminate the Check Engine Light one or more of the following codes: P0011, P0014, P0021, P0024, P0341, P0346, P0336, or P0391. Our technicians tell us that some vehicles may require a powertrain control module (PCM) software update to correct this issue. Other vehicles may have excess camshaft end play on one or both cylinder heads which will need to be corrected using special procedures outlined by GM.

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Average mileage: 110,336 (68,000–200,000)
5 model years affected: 2007, 2008, 2009, 2010, more2011
19 people reported this problem
problem details
2008 GMC Acadia 77,500 mi,
check engine light stays on and reduce engine power light comes on car stops , then wait a while then the engine light stays on but then the reduce power light goes off the car become drivable
2008 GMC Acadia 150,000 mi,
P0011, P0014, P0021, P0024 codes Traction control is off.. engine light is on. Weekly issues with this vehicle.
2007 GMC Acadia 78,700 mi,
Hhr traction control light comes on code is p0014 and car shifts extremely hard, causes check engine light to come one which won't allow me to remote start
Car started running poorly and finally will not run at all. The car will still start but has two reported error codes P0011, P0014, both related to cam shaft sensors.
2008 GMC Acadia 107,000 mi,
Engine light and p0011 code
2008 GMC Acadia 200,000 mi,
The camshafts wore out the camshaft bearings and moved laterally as a result and its gears jumped out of place in the timing chain. The engine stopped producing power needed towing. Bearings were all over intake valves. Engine appearance was perfect for 200,000. Clean with no slug, no oil spillage. Had traction control fixed 6 times.
2009 GMC Acadia 98,500 mi,
my check engine light is on and code P0014 was detected plus others that may be caused by this problem. At 1-2K RPMs it makes a deep sound that sounds like the engine is struggling to run properly. Also my lift gate keeps coming unlatched when I put it in park and my left headlight won't work. We changed it out and it won't turn on (electrical connection issue).
2007 GMC Acadia 160,000 mi,
SStalls once reach 40 miles per hour
2011 GMC Acadia 68,000 mi,
Gmc acadia 2011 When i start the truck make rarely noise my mechanic is telling me I have to do timing chains because chains have stretch and it's a problem with all 3.6 engine but gmc don't want to admit it and oil consuming it eats one quart of oil for every 1000 miles import cars you change timing belt on 100000 miles and gmc can't even get to 70000 miles with metal chains this is why people are loosing trust on American cars
2007 GMC Acadia 78,000 mi,
This arcadia is so problematic is crazy.