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A year ago, Diesel World magazine published a Q&A with Rich, a Duramax owner whose 2009 truck was producing frequent P0087 trouble codes while towing heavy in summer heat. In the Q&A, I mentioned the causes and the usual solutions for this problem, which included an ECM program change that allows the computer to be more tolerant of acceptable fuel rail pressure variations. Typically, a P0087 is caused by worn fuel injectors and the system’s inability to maintain a fuel rail pressure called for by the computer. Replacement injectors cost thousands of dollars, and the truck usually runs normally without producing trouble codes during all other types of driving, which makes it harder to make the decision to spend all that money.

I received a message from Rich recently after he had his ECM updated with a program change to help with the frequent appearance of the P0087 codes. Here’s Rich’s report:

“Hi. Time for an update. A couple months ago, John Kennedy added a dual lift pump and changed the parameters in the ECM regarding the P0087 code. I also installed an Edge Insight CTS2.

I now have two 200-plus-mile trips towing my big iver under my belt — the last one in 90 degree heat. In local driving, I had one very quick DPF regen at about 450 miles with an indicated 37 soot load. So far, there are no codes, towing or otherwise. The new monitor is particularly useful to me for keeping track of a list of variables, such as fuel temperature, which seems to be a factor in throwing the code on high mileage injectors.

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Diesel World September 2019, When Oils Sucked : Vintage Engines Designed to push Innovation, Cylinder Heads Everything you need to know, And More....