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Discussion Starter #1
I have a friend that has a 01 cummins an the rpms only show half the time,any idea:banghead:
 

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mine does the same. about 75% of time it works. i will monitor to see if anyone knows why.
 

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my guess is cam sensor
 

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:ditto: what he said
 

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Mopar1973Man.Com
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Don't guess pull the error codes and it will point out the bad sensor!
OBD II Error Codes

There is only 2 sensor that could control the tach. crank sensor (if equipted) or the cam sensor. There is also a lead that goes from the ECM to the PCM for tach signals too. There is also a error code for that lead if there is a problem.

But maybe the cluster is screwy... Here is how to test it...
Cluster Testing
 

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i will guess that mine is the cluster. will do test tomorrow, but when tach lays at 0 the attitude still shows actual rpm. lly, hope you got a solution from these guys also
 

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Discussion Starter #7
Thanks for the help guys
 

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Crankshaft Position Sensor. Have the same problem with my truck right now.
 
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