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P0336 No Tach, Lack Of Power

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Just picked up the truck from a buddy, it’s a 1999 Dodge Ram 2500 24v Cummins. Sold it to me for a good deal with one problem code p0336 no tach, causing a lack of power. He told me he replaced the sensor with many different brands, and got them ecm tested and the tach worked on bench. The oreillys brand sensor works the best, works for 3 seconds and tach dies. He called a mopar friend of his and he told him to get a cummins brand crank and cam sensor. I got a cummins crankshaft sensor and tach didn’t move. Recorded live data from my code scanner and my OBD2 is able to read my RPMs, but nothing on the dash. I’m stumped

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  • IBMobile
    IBMobile

    If you keep replacing the crank sensor and get the same result then it's not the crank sensor.  The ECM was good when tested so new sensor and good ECM then may be bad connector/wiring.   I would star

  • Dieselfuture
    Dieselfuture

    I have a spear ecm programmed to my truck and if I use it my tack will randomly drop to 0 on cluster but in quadzilla it still shows rpm. It will set a 1698 code. Switch back to the other ecm and no p

  • Dieselfuture
    Dieselfuture

    It could definitely happen, this is not the first case. @dripley knows all about how to giggle a wiring harness. I believe there is a ground splice just before ECM, it's on my list to do also.

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  • Author
5 minutes ago, Mopar1973Man said:

@Auto Computer Specialist which happens to be a vendor here. 

 

https://mopar1973man.com/forum/196-auto-computer-specialist/

 

Give them a call and let them know I sent you.

I appreciate all the help! I will definitely give them a shout today. I’ll also keep the forum updated on what I find out Incase anyone else runs across this

    • Like 1
    • Owner
    Just now, Blakehenryy said:

    I’ll also keep the forum updated on what I find out Incase anyone else runs across this

     

    Excellent... This how we all learn from what happened and can pass it on to other members.

    • Like 1
    4 hours ago, Mopar1973Man said:

    OL = over load. In ohm is infinite ohm. Which means open wire or broke wire.

    I was always under the assumption that OL meant open loop, but we all know where assumptions take us.

    • Owner
    On 1/18/2019 at 11:22 AM, Dieselfuture said:

    I was always under the assumption that OL meant open loop, but we all know where assumptions take us.

    Makes some sense... :shrug:

    • 2 weeks later...
    • Author

    Just got an email from automotive computer specialist and it has been confirmed that is my ECM

    • 3 weeks later...

    The easiest thing to do is drop your starter and pull the CPS then with a mirror or borescope check the tone ring. I fought the same problem for a few months. It can be fixed without pulling the motor, as long as you have some patience. I'm working on a write up to detail the whole thing. Dodge no longer sells the parts but cummins has them for about $150 you will get the tone ring and 5 screws that hold it in. I have part numbers, torque specs and a tool list. Pics of the position the crank need to be for install. 

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