This is an outstanding topic that I stumbled into searching for info on error code P1693 & P0121 which I get when my engine drops to idle. I posted on 911 yesterday. Snoking, earlier you mentioned P1693 in relation to the VP44 but was told that 1693 may not be significant.
P0121 showed to be the trottle position sensor. Is this correct? If so, what does the P1693 indicate? Exactly what is the function of the tps? Does it just report that the engine is not responding to the throttle or does it mean the TPS failed to control the throttle?
I had my VP44 replaced in 2004 along with the lift pump. About a year earlier, the lift pump went out and was replaced under the 5/100,000 with a few weeks remaining in the 5 years. When the VP44 quit, they said the lift pump looked ok but had to replace it to warranty the new VP44. I requested the job to be done under warranty because I believed the earlier pump failure probably damaged the VP44. At that time I was 12 months out of the 5 years, but only had about 78,000 miles on it. I insisted they contact Chrysler. They later insisted that all warranties including Cummins had expired. I wish I had gone back and re-read my book.
Thanks to these postings, I pulled out my warranty book and sure enough, on page 12, it sas the Cummins Diesel Engine Limited Warranty begins "at the end of the 3/36 Basic Warranty period". I was still in warranty and now will make every attempt to go back and collect a refund. Since they lied to me and said I was out of warranty, I should not have to spend hours going back to 1998 tax files to find all of my receipts . I save every receipt for everything even if not tax deductible, but by the time I get through with taxes, individual receipts are hard to find.
I will first request the dealer who did the work to refund what I paid. If they refuse, I'll file complaints with the Texas Atty Gen. then figure out my next step. Any suggestions? And If you know about the P0121 &1693, please either post it or email me.