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.
The Check Engine Light With Code: P0011, P0014, P0021, P0024, P0341, P0346, P0336, and/or P0391 on Pontiac G8
Average mileage: 58,478 (14,300–155,000)
Engine affected: 3.6L V6
9 people reported this problem
4 people shared problem details
2009 Pontiac G8- 3.6L V635,000Visitor
check engine light came on. code p0021 shows. car still run great so hope its an easy fix.
2008 Pontiac G8- 3.6L V660,770Visitor
Engine Light came on, had diagnostics checked with code coming up p0021
2009 Pontiac G8- 3.6L V6155,000Visitor
P0021 CODE. ENGINE RUNS GREAT. BEST GAS MILEAGE IN YEARS. SAME CODE CAME UP AT 75,000 MILES; COST ME $900 TO FIX AT DEALERSHIP.
2009 Pontiac G8- 3.6L V614,300Visitor
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