Problems That Won't Cause a No Start on a DT466E

When working on a truck that won't start it is important to know some of the problems that won't cause a no start on a DT466E.

That way you won't waste time working on something that won't help with the problem.

This post is a section from my book: DT466E No Start Diagnosis. For more information or to buy the book just click on the tab above the first post.

Problems that do not cause a no start
Before going into problems that could cause a no start, it is important to cover some things that WILL NOT cause a no start.

1. ECM/IDM failure. Although it can cause a no start, failure of one of these components is so remarkably rare that replacement should never be contemplated by anyone but a knowledgeable professional. The replacement will need to be programmed by a dealer, anyway. There are even DTC codes calling for replacement that cannot necessarily be believed. In short, NEVER replace that computer!
2. Failed IAT, TPS, EBP, EFP, or ECT sensors alone will not cause a no start, but can cause driveability problems or might combine with other issues in a no start situation.
3. A low coolant level or sensor will not cause a no start, although it may shut the truck down after a period of running.
4. A bad injector will not by itself cause a no start, and the sudden failure of a set of injectors is extremely unlikely. There are injector-related exceptions:

• The injector fuel seals can fail and cause a no start, but this condition will cause low fuel pressure, and probably fuel in the oil.
• In 2004 and later engines the oil inlet pockets in the top of the injectors can wear and cause a no start, initially when the engine is hot. This sometimes necessitates changing all the injectors.
• Leaking injector seals can cause a no start, usually initially when the engine is hot.
• A very high mileage engine may have a set of worn injectors that finally cause a no start condition, but this will have been preceded by hard starting, rough running, and smoking when the engine did start. Often these engines will run after being started with ether.
• Another exception is the rare occasion when an injector tip valve sticks open; this can cause the cylinder pressure to pump lots of air into the fuel system. The fuel pressure may be high and the engine will certainly shut down and fail to start, after a period of running.