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Discussion Starter #1
First time posting here in the 6.0 as I have a 7.3, but a friend is having trouble and I told him I’d try to help.

Guy I work with was driving into work and literally had a half mile left to go and his truck just died on him. It wouldn’t start back up, not even a click of the starter. We used the dead crank wire to the starter and the engine turns over just fine. Tried two different code readers and both were unable to communicate with the PCM at all. Also, his mileage (total and trip) only shows dashes. He thinks the PCM died. I really just don’t know.

We weren’t able to do much testing and won’t for the next few weeks as he just deployed for a short time but I’d like to have some info to give him when he returns.


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Compression Ignition Addict
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5,526 Posts
A PCM issue is not likely.

Check fuse F2.22 (under the dash). Also check the fan clutch wires. If nothing is obvious with the wiring, try cranking w/ the fan clutch disconnected.

Lastly, it may be an issue w/ one of the multiple sensors that are tied into the v-reference circuit. The EBP sensor is one of the more common ones to have issues, but there are numerous possibilities. If the first suggestions (the fuse and the fan clutch) don't reveal anything, then have your friend attempt to crank while you wiggle the engine harness around.

Another possibility is the transmission range sensor. See if it will crank in neutral or when the gear shift lever is moved slightly.
 

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Discussion Starter #3
This is what he said:

Thanks man. I did some more trouble shooting because we had some jet issues. The fuse at the 22 spot (ECM) blows the fuse every time you put a new one in and try to start. I have a box of em, and it went through 3 fuses with 3 start attempts.

He then said his wiring harness does look rough but he thinks his ECM is fried.


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Compression Ignition Addict
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Well, best of luck. IMO most of the time it is wiring (the fan clutch and EBP sensor are the two most common sources of the problem) and it is very uncommon for it to be the ECM (PCM), but it is only money to just change it out since it is a possibility. It would be good to hear what troubleshooting was done to lead him to that conclusion ....
 

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Discussion Starter #5
Thanks. I’ll let him know. He probably hasn’t looked at the price of one yet. I would venture its a shorted wire somewhere but I’ll let y’all know what becomes of it


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