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24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps

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My dads truck has a P0720 code. It's '99 CTD. It says "low output speed sensor RPM, above 15mph". Would this be the sensor on the rear diff going south?... JOIN NOW TO REMOVE TRACER

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Old 05-20-2009, 10:30 PM
DeLuzGN's Avatar
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Default P0720, speed sensor location?

My dads truck has a P0720 code. It's '99 CTD.
It says "low output speed sensor RPM, above 15mph".

Would this be the sensor on the rear diff going south?

DeLuzGN's Sig:1999 Dodge Cummins, Q/C, 4x4, auto w/ some upgrades (previous owner did something to the trans....), FASS hpfp w/ 1/2" lines, Isspro EV fuel, pyro, boost, trans temp, Smarty, power puck, AEM Brute Force intake with Amsoil nano-fiber filter, silencer ring MIA, straight pipe, corroded black paint, homebrew biodiesel.
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Old 05-20-2009, 11:06 PM
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Originally Posted by DeLuzGN View Post

Would this be the sensor on the rear diff going south?

yes I believe so..................cheap enough to replace to find out

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Old 05-20-2009, 11:36 PM
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yeah i did mine in the middle of winter axle all frozen up it sucked
but yeah rear diff passenger side top

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Old 05-21-2009, 05:48 PM
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Great guys, thanks for the confirmation I'll toss one in there for him and see how she runs.

---AutoMerged DoublePost---

I found some more info on this code. it refers to the output speed sensor which is located on the tranny overdrive gear case and it monitors the trans output shaft rotating speed.
$30 at napa for the sensor.
hopedully that does it.

Last edited by DeLuzGN; 05-21-2009 at 05:48 PM.. Reason: Automerged Doublepost
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