GMC Sonoma owners have reported 5 problems related to engine (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sonoma based on all problems reported for the Sonoma.
My engine has been surging, slow start, rattling, rough idle, hard shifting, and I have had the trasmission replaced 3 times. My dealer told me after an inspection that there was nothing wrong, but it was under warranty at the time. Go figure! I have proof of the new trasmissions. Now the compressor is cracked, and it will not hold coolant, and I can hardly get the truck going after sitting all night. These repairs are costing alot of money, and I am still paying for this truck. It is not worth the cost of repairs.
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all problems of the 1996 GMC Sonoma
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Constant vibration from engine due to a missing engine mount.
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all problems of the 1997 GMC Sonoma
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Consumer states the engine oil drain plug has a small hexagonal head, the socket or wrench slips on the plug head and damages the plug, consumer had the plug removed by the dealer and purchased a new plug and now consumer has to buy a 6 sided box end wrench, which is difficult to find, to assure it does not slip on the hexagonal head of the 15 mm plug.
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all problems of the 2000 GMC Sonoma
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Consumer noticed smoke coming from out of the engine compartment. Vehicle was towed to dealer, dealer was replacing the engine.
Timing chain broke at only 42,000 miles, and while driving, it causes valve to push through head.