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Check engine light came on in my 2003 H2 Hummer. What do I do to find out why?

Tiny
SEMOBEAGLEWING
  • MEMBER
  • 2003 HUMMER H2
  • 122,000 MILES
Just looked at the gauges and noticed the check engine light was on. It's ready for an oil change. I reset the % until I can change the oil. Would that be the problem?
Thursday, December 15th, 2011 AT 4:38 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
That won't be a problem. However, make sure you don't forget. Also, when you do change it, reset the computer again.

MAKE SURE THE OIL LEVEL IS FULL.
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Thursday, December 15th, 2011 AT 4:40 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
To address the check engine light, you need to have a diagnostic system check of the powertrain. This can be done at most auto part chains. Regular occurrences involve a faulty catalyst(P0420/430), vent system performance(P0446), or oxygen sensor heater circuit faults. As a primary visual you can do yourself, check that the fuel cap is fully installed.
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Saturday, December 17th, 2011 AT 6:49 AM

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