syrpatrick Posted May 14, 2013 Share Posted May 14, 2013 My lady was drving our 1999 Ram 3500 cummins turbo diesel, getting on the highway and throttling up when all of a sudden the check engine light came on and our big white truck slowed down to a crawl, 20 mph max. We limped her home and called a good friend of mine who has a code scanner, he hooked it up and it came up with a P1689 code. She will start up and idle, step on the pedal and she studders a bit a Safety shut down mode I suppose with the 20 mph max..Please help me get my baby purring again..Patrick Link to comment Share on other sites More sharing options...
Texas CTD Posted May 14, 2013 Share Posted May 14, 2013 http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/228-p1689-no-communication-between-ecm-and-vp44 Link to comment Share on other sites More sharing options...
Administrator Mopar1973Man Posted May 14, 2013 Administrator Share Posted May 14, 2013 Another set of questions...Q: Do you have a fuel pressure gauge?Q: What's your fuel pressure like from Idle to WOT at highway speed?Q: What fuel system are you running? Link to comment Share on other sites More sharing options...
cajflynn Posted May 14, 2013 Share Posted May 14, 2013 Fuel filter?Lift pump?Injection pump? I'd check things in that order. 1 Link to comment Share on other sites More sharing options...
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