The Right TSB
I took my 04. 5 to the dealer to get PCM reflashed with the TSB 18-037-04 update. The overhead console readout was way off. When the computer showed 30 miles DTE, a manual calculation at fill-up showed over 103 DTE. A 73 mile difference warranted the reflash. Had the power cord for the block immersion heater put on at the same time (yeah, I know; I could have done it myself for less and gotten the parts at the Cummins dealer cheaper, but I chose this way!)
So, I picked the truck up in the afternoon. On the way home, I filled her up so that I could do a comparison on the next fill up. I did that about two weeks later, and son-of-gun, no change. Overhead console still way off, and no improvement in mileage. But, as I was checking the oil during the fill-up, I noticed that the service tech had written TSB 18-007-04 on the modification tag under the hood.
Back to the dealer, and yeah, the service writer gave me the same song and dance he gave you and every service writed gives to every one. "Our computer is programmed with the latest upgrades and your engine number determines ... ... yada, yada, yada ..... blah, blah, blah. But I prevailed and said that I wanted them to put it back on the computer and determine which upgrade had been applied. So they humored me and did it. Came back out, said the truck was fine, the correct PCM flash had been done the first time, and it was just the service tech's mistake in putting the wrong TSB down as the authorization for the modification. Yeah, right!
So how come on the next fill-up the mileage was up 2 mpg and the overhead console was reading only about 2. 5 miles off on the DTE. I know I didn't make a mistake in my original calucations, because I still have the receipt from the local Shell showing the gallons sold and the mileage since the last fill up written on the top by me. I've filled up twice since then and the mpg increase is holding at a nice 2 mpg.
This is a nice truck. The drive train is a sweek combination that hauls my 27. 5' 5er as easy as you please. I love the engine (who wouldn't). I just wish the dealers would be a little more honest with us.
Cobblestone (a little piece of the Granite State)
