Loss of power momentarily

if the cel and stop engine lights didnt come on, id say throttle pedal sensor

that those lights did come on, im thinking main fuse panel hanging off firewall

(this is with different truck and motor...western start dd15)

but you could wiggle the fuse box on the firewall and cause the issue to happen

 

I'm not super familiar with the Series 60 but we had a Peterbilt with a Cat that would do something similar. Ended up being a faulty coolant level sensor.

 

Usually if a coolant level sensor detects low coolant level the ECM will shutdown the engine to protect it. I would think it would at least give a bit of a warning but like I said I'm not really up on trucks as much as I used to be.

 

I would think it'd throw a code for shutdown or log an event at least. Only thing I can think of off the top of my head is if you had temporarily lost keyed power. The ECM would likely view that as turning the key off, which wouldn't log anything except maybe an engine start if the Detroit software reads that info.

 

Don't recall on the series 60, but on the newer detroits if a coolant sensor is at fault, it'll throw a code along with shutting the engine down a few seconds later.

Pretty easy to see if it's a coolant sensor or not though. Typically they'll break from vibration over time OR the most common problem I've seen is people getting up on top of the motor for whatever reasons and bumping the sensor lose or off when climbing up/down.