SL/R129: 1999 sl500 shift module
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Member
Joined: Aug 2007
Posts: 109
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From: North
W203X2 w201X3 W208 W129
1999 sl500 shift module
Hey all, my 99 sl500 had an issue where it would not shift out of 1st. I did not figure it out until it was dark. the shift module lights were not coming on. when shifting to D. I have to jiggle the shifter or find the sweet spot for the light to come on and for the transmission to receive the electrical signal from the shift module.
I have replaced my shift assembly with a used Ebay unit
.. it does the same thing. is there a write up or video on how to repair the shifter?
Thanks-Brian
I have replaced my shift assembly with a used Ebay unit
.. it does the same thing. is there a write up or video on how to repair the shifter?
Thanks-Brian
Thread Starter
Member
Joined: Aug 2007
Posts: 109
Likes: 0
From: North
W203X2 w201X3 W208 W129
I should rephrase this. I believe the issue to be the shifter. the 722.6 has an electrical shift assembly. I first thought my issue was the transmission itself not shifting. it's truly within the shifter assembly. it internally is not registering that it is in gear. Not lighting up " D " and not sending the signal to the TCM. when the selector light does come on when in the "sweet spot" the transmission functions normally. when the shifter does not register the gear and the light does not come on even tho it's in gear car takes off in second and will not upshift.
Anyone else experience this? can I take apart the shifter clean it? any tips? I have tried to replace it with a used unit unfortunatly this part does the same thing... maybe try another used unit?
Anyone else experience this? can I take apart the shifter clean it? any tips? I have tried to replace it with a used unit unfortunatly this part does the same thing... maybe try another used unit?
Last edited by E=MC^2; Mar 7, 2021 at 10:16 PM.
Senior Member
Joined: Mar 2020
Posts: 253
Likes: 46
From: Riverside, CA
1999 SL600
You probably have trashed shifter bushings then. Get them checked out. You should still try what I previously suggested. Also take a look at the tcm for fluid intrusion and look at the pilot bushing for any wetness
Super Member
Joined: Jul 2016
Posts: 705
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From: NE OHIO
1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
shift issues
I would start with inspecting the electrical plug connection on the passenger side of the transmission just above the tranny pan corner. Once you removed the plug look for fluid. This is a very common failure.
Have you kept up with tranny fluid & filter changes?
Have you kept up with tranny fluid & filter changes?
Newbie
Joined: May 2024
Posts: 9
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BYD SONG
Hey all, my 99 sl500 had an issue where it would not shift out of 1st. I did not figure it out until it was dark. the shift module lights were not coming on. when shifting to D. I have to jiggle the shifter or find the sweet spot for the light to come on and for the transmission to receive the electrical signal from the shift module.
I have replaced my shift assembly with a used Ebay unit
.. it does the same thing. is there a write up or video on how to repair the shifter?
Thanks-Brian
I have replaced my shift assembly with a used Ebay unit
.. it does the same thing. is there a write up or video on how to repair the shifter?
Thanks-Brian
