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Temerarius 09-27-2012 10:37 AM

P0717 and an MB Transmission
So, my 2009 JGC threw a P0717 error (goes into gimp mode and locks down the tranny).

It's a bad input speed sensor on the transmission.. no biggy.. UNLESS you have the Mercedes transmission (which my 3.7 does apparently) and not the 45RFE that most every other model has in it.

If it had the 45RFE, it would be a simple bolt to replace the sensor.

But, as it's the Merc, you have to drop the tranny and replace the entire assembly.

Part ran about $250 plus fluids and what not... grand total was about $800.

Ye been warned fellow 09 3.7 JCG owners...

2005JGC 09-28-2012 10:48 PM

Re: P0717 and an MB Transmission
you do NOT need to drop the trans, its the lead frame where the speed sensors are located, it mounts above the valve body, dropping the pan (easiest pan EVER), remove the guide bushing (the plug bushing) and drop the valve body. unsnap the lead frame, snap the new one in and reverse procedure.

stashgto 09-29-2012 11:39 PM

Re: P0717 and an MB Transmission
I did mine a few months ago like 2005 said there's no need to drop the trans.

BLKCRD 03-05-2013 10:32 AM

Re: P0717 and an MB Transmission
Hello guys,
My Jeep is having the same problem. I'm getting the same code P0717. Dealer recommended replacing the Electrohydraulic Unit. Did you chanage just the sensor or the whole unit? price is a lot different for each.

asselin85 06-04-2015 10:48 AM

Re: P0717 and an MB Transmission
My 08 Grand Cherokee is throwing the same code and the dealer is saying $750-$1200 to fix because the tranny needs to be dropped. He insists the speed sensor are within the tranny, does anyone know if this is true?

Frango100 06-04-2015 11:14 AM

Re: P0717 and an MB Transmission
1 Attachment(s)
The two speed sensors on the NAG1 transmission are part of the electrical control unit, which is attached to the hydraulic control unit.Both units can be removed as one module after just dropping the oil pan, no need to remove the whole transmission for that. Ofcourse the stealer likes to tell you a story to explain the high cost to replace the part.:rolleyes:

BLKCRD 06-04-2015 12:35 PM

Re: P0717 and an MB Transmission
Yes that is correct. I had mine replaced and it's working great. While you're there it's a good time to change the tranny oil as well. Up here the dealers wanted $900 just for the part.

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