Question about 2006 Pontiac Grand Prix
3.8 supercharged, check gas cap lamp on below 1/2 tank of gas.replaced with original equipment replacement part. still comes on, now check engine lamp also on
You probably have a problem in the evap emissions system and a superficial engine diagnostic @ a shop will likely confirm this. a loose gas cap is the most common cause for this, so it tells you to check it first in an attempt to save you a trip to the shop. if the cap is new and tightened past 3 clicks, then the problem lies somewhere else in that system. there are many parts in that system, so it probably would be best left to a shop to figure out exactly what the cause is.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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