ENGINE LIGHT ON CHECK GAS CAP LIGHT ON PUT ON NEW CAP RESET COM ENGINE LIGHT BACK ON 50 MILES LATER WHAT DOES IT NEED?
WHAT IS THE PROBLEM WHIH ENGINE LIGHT on 2008 Pontiac Grand Prix
the gas cap light signaled that your gas cap was loose...the engine light signals that your engine computer senses something that is not within parameters...buy a scanner or go to a shop that can scan it for you.
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You need to have your computer system scanned to see what codes you have stored. Then post again so we can advise.
Replace The "Solenoid Vent Valve" (Fairly Easy Fix), Under the Left Rear Bumper,...For the "Check Gas Cap" Problem,I Did This & It Solved the Problem!! Replace "Air Pump" & "Control check Valve" That it Flows Into !!! ~ Also, 1st Have The "Air Pump Relay" Checked For Being Defective, As This Could Be The Main Problem !!!