Hey guys. My old man drives a 1998 w900. N14 cummins with an 18speed behind it. We took the truck in after the transmission grenaded. Since then the speedometer hasn't worked. So we replaced the sensor. Still nothing, gentleman at the shop said to try another ecu. So we plugged that ecu in. Mind you, it's not throwing a single code. But the speedometer still isn't working, the fan won't shut off, and the cruise control won't work either. It still idles up when you turn it on, but when driving it won't hold a speed. Anyone had similar issues?
W900 ecu problems
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Bmoore98, Apr 23, 2026 at 10:19 PM.
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