Check Engine Light Due to Gas Cap Issue on GMC Sonoma

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 92,958 (21,965–209,430)
9 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004
21 people reported this problem
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Viewing 1 - 8 of 8 problem details
Service engine light keep coming on. We finally just replaced the the gas cap and it took care of the problem!
2002 GMC Sonoma 73,477 mi,
Forgot to tighten cap, drew code, tighten cap reset code, vwalla..
1996 GMC Sonoma 125,000 mi,
replace cap
2001 GMC Sonoma 68,750 mi,
loose gas cap--engine warnuing light
2002 GMC Sonoma 77,000 mi,
after filling up and twisting cap till it clicks 3 times ODB code reads 0442 it does not always happen though!
1996 GMC Sonoma 209,430 mi,
replaced gas cap 2 times this year.. not sure if its a gmc problem or the kind of gas we all have to deal with now.. I hear its not good and dry rots the gas caps
2003 GMC Sonoma 21,965 mi,
Light came on after filling up.
04/2010 Freeway road was uneven at end of bridge. I hit dip going 60 mph. Truck bottomed out and I nearly lost control. Check engine light came on. I spent $100 to have problem diagnosed as broken fuel cap. 03/14/12 Happened again. 13 reported problems? I think the dealer should refund me the $200 I spent to diagnose this problem.