Posted April 8, 20187 yr 99 Dodge 3500 auto throws code for no com from pump to ecm it’ll run with ecm bypassed all wireing checks put a ecm off of a 2000standard still nothing
April 8, 20187 yr Owner I'm going to assume you are talking about the P1689 code. There is a few things that can cause that code. Possible Causes Wiring & Connectors Fuel Injection Pump Relay Output Circuit Open Ground Circuit Open Or High Resistance Datalink (+) Circuit Open Datalink (+) Circuit Shorted To Ground Datalink (-) Open Datalink (-) Shorted To Ground ECM
99 Dodge 3500 auto throws code for no com from pump to ecm it’ll run with ecm bypassed all wireing checks put a ecm off of a 2000standard still nothing