Check Engine Light Due to Gas Cap Issue on GMC Sonoma

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

RepairPal Verified
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
8 people shared 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 Sonoma73,477
Forgot to tighten cap, drew code, tighten cap reset code, vwalla..
1996 GMC Sonoma125,000
replace cap
2002 GMC Sonoma77,000
after filling up and twisting cap till it clicks 3 times ODB code reads 0442 it does not always happen though!
1996 GMC Sonoma209,430
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 Sonoma21,965
Light came on after filling up.
2001 GMC Sonoma68,750
loose gas cap--engine warnuing light
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.
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