5.9 DIESEL ENGINE CUTS OFF WHEN DRIVING
From what I can gather, the engine cuts out and then the check engine light comes on, not the other way around, check engine light and then cut out?
If you switch on the ignition but do not start the engine, you will see that the check engine light is on. It won't go out until you start the engine.
When the engine cuts out, it is just as though you have switched on the ignition without starting the engine, the key is in the exact same position, and therefor the check engine light comes on purely and simply because the engine isn't running, not because it has sensed a problem, hence you have no fault codes, its perfectly normal.
If, however, the light comes on then the engine cuts out, then the reason for the lack of codes could be a short term electrical failure. If the power to the ECM were briefly cut then the codes would be erased immediately, but this would have to be a complete failure because there is a KAM (Keep Alive Memory) wire, which supplies permanent power to the ECM if I'm not mistaken. A good candidate for a complete failure is a bad main ground cable (loose or broken).
Wiring problems a just the worst ever to trace.
Just a thought to hopefully point you in the right direction.
Very best regards
Jun 10, 2008 |
2007 Dodge Ram 2500 Mega Cab Laramie