My truck loses horsepower intermittantly, like the engine is being derated. I finally got a 259 code when I flash it. Yellow lights comes on...
I will check the water, it was full, and it doesn't heat but you never know. Thanks
It is a 2000 with an ISX Cummins
Had 1/3 heavy fuel, at start of winter, and filled up with light, but never drove for for a couple weeks. After couple thousand miles I started...
Thanks, It has the 8.6 volts coming directly right at ecm. Do you think something in the ecm is haywire.
I was wondering if anybody knew what the voltage from ECM should be for engine fan clutch solenoid. I get about 8.6 v, but the fan won't work...
Thanks your the replies. Is it possible to test the dash switch by jumping it, or could that damage the ecm
2000 Kenworth w900l Cummins isx. The manual setting for the fan won't turn on the fan. Automatic setting seems to work fine though. I was...
