why RPM drops
11-20-2021, (Subject: why RPM drops ) 
Post: #1
why RPM drops
2015 pererbilt 579
ISX 2350
500 k miles
recently it happens several times that after starting the truck the rpm gauge falls down to zero although the engine is idling.then the orange engine light comes on. if I turn off the truck and restart it again it is as it should be.
I'm wondering if there is sensor going bad or a something else.
your input greatly will be appreciated.
11-20-2021, (Subject: why RPM drops ) 
Post: #2
RE: why RPM drops
If the engine light comes on then there will be faults stored in the ECM. Plug into it and check instead of guessing. Could be data link related.
 Thanks given by: Rawze

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