The Check Engine Light With Code: P0011, P0014, P0021, P0024, P0341, P0346, P0336, and/or P0391 on Pontiac G8

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: 39,174 (14,300–60,770)
Engine affected: 3.6L V6
2 model years affected: 2008, 2009
8 people reported this problem
3 people shared problem details
2009 Pontiac G8- 3.6L V635,000
check engine light came on. code p0021 shows. car still run great so hope its an easy fix.
2008 Pontiac G8- 3.6L V660,770
Engine Light came on, had diagnostics checked with code coming up p0021
2009 Pontiac G8- 3.6L V614,300
The check engine light comes on, followed by the reduced power indicator. I've already had it at the dealer once, and it's there again right now. I don't know what they'll do this time. The first time it was a computer problem.
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