Jeep will not rev in gear

Niall Owner/Technician United Kingdom Posted   Latest   Edited  

1J8G8E8A94Y… Grand Cherokee CRD Auto

Has 2.7 ltr 5 cyl mercedes diesel with merc gearbox.

Vehicle starts OK, will rev quite happily in park or neutral, however when any gear is selected engine will not rev much above 900rpm, there is no thump gentle or otherwise from the drivetrain and no attempt to move, if the revs are held at 1500 and gear selected the engine revs will just drop with no indication of drive. This is one of those "smart a**" gearboxes with a dipstick tube and no dipstick, I ran a cable down the tube the fluid level would appear to be high (fault is present after sitting overnight). Unfortunatelly this is the vehicle that Launch would not show any PCM info just codes (app code, cleared and not returned tested on generic seems good) I do have gearbox coms with live data.

Before I head off in the gearbox direction anyone seen this before!!

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Manuel Diagnostician
New Jersey
Manuel Default
 

Is your launch tool updated? I would try in android App Store crd tool it’s free tool to work with this exact vehicle but the last crd I had launch worked for livestream on both sides just usual slow working for this era.

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Niall Owner/Technician
United Kingdom
Niall Default
 

Hi what is the exact search name for the app not coming up with anything. New update 2 days ago for Chrysler

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Manuel Diagnostician
New Jersey
Manuel Default
 

Wjdiagpro sorry forgot that part

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Niall Owner/Technician
United Kingdom
Niall Resolution
   

Transfer box removed to check output from gearbox (no oil in transfer box), found sheared and loose bolts at torque convertor. Gearbox removed, there were signs of damage on gearbox side of convertor and managed to fish out these metal lugs belonging to pump gear out of the input seal. Presumably they had some problems fitting a replacement box!!!!. I am hoping as the Jeep was never able to…

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