check engine light comes on when you put the key in and turn the ing. on and goes out when the engine statrs. if you turn the ing. off and do not remove the key, then turn the ing. back on, no light?

Asked by Mar 09, 2015 at 12:28 PM about the 1999 GMC Sierra 1500 SL Standard Cab SB

Question type: Maintenance & Repair

the check engine light will come on when you turn the ing. switch on.  the light goes out when the engine starts.  when you turn ing. switch off and back on w/out removing the key, the check engine does not light?   if you remove the key and wait 5 sec. and insert the key and turn the ing. switch to on, the check engine light turns on?  if you start the engine the check engine light goes out.

1 Answer

150,845

Normal. That's what it's supposed to do

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