Sometimes, the culprit is a fan clutch that has failed. This was mostly corrected in 2006 when GM built the trucks with larger radiators, fans, and water pumps. Engine overheating, blown head gaskets Chevy GMC 6.6-liter Duramax diesel engine | GMĮngine overheating is usually an issue in the summer months when towing. This is a common problem for these two series 6.6-liter engines. Water pump failure Chevy GMC 6.6-liter Duramax diesel engine | GM The plunger inside of the fuel filter is supposed to prime the system but doesn’t always do the trick. Also, the fuel filter housing for the mechanical fuel pump is susceptible to cracking. The lack of an electric low-pressure pump to move fuel to the injection pump is the culprit. Air gets trapped in the fuel lines, causing starvation issues. This problem runs across the board through the 2016 models. Fuel starvation Chevrolet Silverado 3500HD | Chevrolet According to Diesel Hub, the repair is simply reconnecting, or otherwise insulating the affected wire or wires. Sometimes just moving the wires to an individual injector will cause them to work better, if only for a moment. Codes usually indicate an “open circuit” for certain injectors affected by the problem.
Indications of this happening include rough running and no start. This involves wiring in the fuel injector harness that chafes, causing broken or shorting circuits. Fuel injector harness wiring 2022 Chevy Silverado 2500HD | GM This also had the advantage of servicing the injectors easier and also allowed for visual inspection of leaks. The revised LLY version, released in 2004, located the fuel injectors externally. This can cause main bearing failures and worse. What was the problem? The injectors functioned underneath the valve covers.īut when diesel leaks occurred, it dilutes the oil supply. A revised design mostly corrected the problem. Though GM recalled these engines and backed them with a seven-year, 200,000-mile warranty, fuel injectors failing was a big problem. Duramax fuel injector failure Chevy GMC 6.6-liter Duramax diesel engine | GM GM has continued the development of the Duramax diesel to fix these problems. First series designs usually see more issues arise. Basically, the early LB7 version had the largest share of problems. We’ll go through a number of common problems found on the Duramax with the designation of versions it most affects. Some problems encountered with the Duramax run across all versions, and some are more specific to certain years. There were several variations of the 6.6 Duramax. The Chevy/GMC Duramax 6.6-liter diesel engine has proven to be a powerful and reliable workhorse since introduced in 2001.
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