2004 Pontiac Grand Prix Check Engine Light and Low Fuel

29,000 MILES • 6 CYL • FWD • AUTOMATIC
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LURANA
  • MEMBER
  • 1 POST
What could possibly be the reason for the Check Engine light to come on only when the car is low on fuel? But after putting in more fuel the light will go off after a couple hours or more of driving ...then on again when fuel is low?

Oh this is the GTP model with the supercharger. There doesn't seem to be any noticeable performance changes when the check engine light is on and the fuel level is low.
Dec 7, 2009 at 5:58 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
The PCM monitors the EVAP system, since it is a closed system, if there is leak in gas cap, it will trigger the check engine light.

Take to most autoparts stores and get codes read, if you have an EVAP code (small leak), replace the gas cap.
Dec 8, 2009 at 12:34 AM
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