Check engine light came on while driving was solid left over night was on again this morning when I went down the block, then thought I would tighten gas cap I did then went to start it light not on

Asked by Jun 14, 2017 at 12:16 AM about the 2005 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

I was coming home yesterday around corner when
check engine light came on solid and stayed on till I
got home I thought leave it over. Night went out this
morning early down the block still on I then googled
possible causes and saw that a loose gas cap
could cause this I then re tightened the gas cap and
now the light is off Im taking the car to mechanic
tomorrow to make sure everything is ok but I just
want to know would this be the main cause I just
had a service a month ago aswell as a new battery
AC compressor and regas

1 Answer

125,965

Yes a loose gas cap will turn on the check engine light, instead of spending money by having a mechanic check it for codes just swing into an autozone and have them check the codes for free, if the only code that shows is for evaporative emission leak then it most likely was the loose fuel cap, just have them clear the code and be on your way. But if there are other codes then write them down and take it to your mechanic for further diagnostics.

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