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If your are getting the same low voltage on other sensors it could be the ECM. There are 2 5v sensor circuits. One does the oil pressure and MAP I believe and the rest are on the other circuit. Some of this is year specific also. My 02 does not have a5v sensor circuit for the oil pressure, so that circuit only goes to the MAP. What year is your truck? It will make a difference.

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01 body/harness

So if it is the ecm all 5v sensor supply circuits will be the same as the cmp sensor supply voltage?

Also I’d like to add, coolant temp sensor gauge and oil pressure sensor WAS intermittently working, now nothing. Haven’t delved too deep into those issues as I have a/m gauges for those. 

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the 01 and 02 have the 2 circuits as I mentioned. Any trouble codes or drivability issues? I would expect something to be causing one or both? 

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Haven’t check oil pressure sensor circuit yet. This truck has a 12v in it. I’m trying something with one of destroked kits to get the factory tach to read so the typical codes or issues you would get with a bad cmp sensor aren’t going to show. I just was/am a little confused with the low voltage 

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