Has leaked oil, coolant, trans lube, freon since the day I bought it. GM would do nothing. Had to drive a whole year without heat because nobody could figure out why or fix it. Noisy transmission. Mysterious electrical problems. Eats oxygen sensors. Needs new ones every 2 years. Drove about 4 years with the "check engine" light on. Hard to fix since everything is so tightly jammed in the engine compartment. I would not buy GMC again. Yeah, a Sonoma is not a "real" truck. But just because it's small is no excuse for bad design and manufacturing. It wasn't a cheap truck.
It often moves forward when you step on the gas.
Make it repairable. Make it so it doesn't leak a quart a month of every known fluid.
† Edmunds.com received the highest numerical score in the proprietary J.D. Power 2014 Third-Party Automotive Website Evaluation Study℠. Results based on responses from 3,381 responses, measuring 14 companies and measures third-party automotive website usefulness among new and used vehicle shoppers. Proprietary study results are based on experiences and perceptions of owners surveyed from January 2014. Your experiences may vary. Visit jdpower.com.