DD15 crazy sensor bank problem

How many miles did you have on your truck??

 

Did you figure out what the problem was with the code spn 723 fmi8 I got the same thing for the 5th time and I’m looking for new ideas of what could it be
Thanks

 

His problem was the engine harness, so as mine, I believe. Please read 4 posts before

 

i had the symptoms on my dd15 as far as codes. I replaced the harness and the codes went away and ran for a week. Now the codes all came back. There's no way i have zero oil pressure. I put a manual home made gauge where the oil pressure sensor goes and i have pressure. I've replaced the oil pressure sensor with harness also. Out of the codes i feel its the SPN 3510 FMI 4 ECM 5V sensor supply bank 2 circuit failed low
that's causeing it. Any experience with this?

 

Hey did u ever find the problem to this. Currently have same problems. Sometimes i lose pedal

 

Try disconnecting the water pump harness connector at your water pump sensor, see if the engine light goes out and your oil pressure gauge starts working normal. They share the same 5v bank to MCM.

 

Can you elaborate on this 5v bank? Common circuit back to the MCM?

 

Newer trucks that have a variable speed water pump have 5 volts going to it. Sometimes these fail and mess up the 5 volt. Other sensors share the 5 volt.
Looking at this diagram https://www.thetruckersreport.com/t...dule-mcm2-1-engine-harness-page-1-png.316183/. It appears engine oil pressure, camshaft position sensor and fuel compensation pressure sensor may all share the same 5 volt reference.