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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 96,334 (25,376–195,000)
7 model years affected: 2003, 2004, 2006, 2007, more2008, 2009, 2010
29 people reported this problem
Viewing 1 - 13 of 13 comments
when I first purchased the car I had 79000 miles on it and after turning about 1000 or 2000 miles the check engine light kicked on an A code came up as the car was out of time by using the camshaft position sensor bank 1 I replace that since and the repair has not been successful.since that has not been fixed poor performance and response is sluggish on and during takeoff.
Engine is running rough. It feels like it wants to stall at stops but so far has not. The code is P0024
My '04 Cadillac began with my converters getting clogged up sent more then 1000 to get repaired when my transmission gave out. Had to replace that as well with more then 1000$. Replace spark plus gas filter air filter flywheel & now I have to replace my throttle body too! But my reduce engine power & service engine soon light comes on what can it be?
check engine light came on three times since 48000 miles, since I purchased this car,replaced sensor to gas tank for pressure, still came on, repaired wire to sensor, still came on, this time it said fuel leak, no fuel leak! they reset the light, a week later it came on again, it just so came on the same day I got a notice from On Star that my OnStar was not on. I chose not to use Onstar! Something Fishy here, Can Onstar make this check engine light come on When they want to. I give up! the engine check light is still on and the car runs fine.
Engine misfires and noisy
The Check engine light is on and the automatic start does not work.
vehicle runs rough and misfires [timing issue] and loss pf power also excessive spark knock !! code p0021 told the dealer would like to shim i say no way cam controls major functions if there has been excessive play for any period of time the motor has already been damaged !!!
Rattle when first starts
getting code p0336
Car is losing power and now starting to steam like getting to Haut while driving
went to for different shops for 4 different repairs all told me my cadi has 34 codes. some are history codes. had the cat converter replaced, water pump, muffler welded, and had the cat converter welded into place. and have head lights recommended = air bag message pop up every 20 min. what can done about this how are we suppose to renew tags this way
still not fixed. Paid 600$ for work done at shop then told they couldn't do the work needed to repair. Called an expert who said not worth the 5000$-7000$ cost to replace engine!! Brought back to Cadi dealer we bought car from. They have had car 5 days no definite answers yet
Check engine light, car not reaching temp, thermostat stuck in open position, replaced thermostat, corrected.