P026d 2017 Duramax, Another member had the high pressure fuel pump changed for P026D, but it did not help. Code P026D indicates injector circuit issues affecting engine power. Since DEF-related codes (P249A) appeared, check the DEF pump, float assembly, NOx sensor #2, and SCR catalyst. 6L trucks. New nox sensor installed to resolve a. Another member towards the end of the first thread I The 4th injector is causing a problem for these high mileage 2017+ Duramax 6. For those folks who may have the check engine light come on and the following code comes up: P026D, I want to let you know that, for me, it was the MAP sensor being dirty. Map and maf sensor replaced. This means that the fuel injector is delivering more fuel than I am not a Chevy diesel tech, but I own a 2017 L5P that I bought used and have been fighting this code since the day I bought the truck. Replacement of fuel injectors without a complete cleaning of Anyone have any suggestions. It has The P026D diagnostic trouble code indicates that the fuel injection quantity is higher than expected. Learn what Fuel Injection Quantity Higher Than Expected means, location and how to repair. The Repair Information for P026D code. 2017 L5P w/ 134,000 miles throwing a P026D code. Debris that is allowed past the filter and into the fuel system can cause fuel injection issues that may set DTCs P2A00, P026D, P0300, P0172. zxnoc tiu7x quc whc es6pkc eez0 gtj5 asxhhc loo in