Rear end shudder while turning left at slow speed?
Junior Member
Joined: Sep 2018
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From: Houston
Hi, when I disconnected the power cable (it may be a good idea to wrap the wire in a plastic bag or similar to avoid accidentally touching something sensitive with it), I found there was still some voltage on the terminal, due presumably to either power coming back through something else connected to the junction box, or from internal capacitance of some of the components. To ensure the voltage at this terminal is really zero, to reset the control unit, I took a piece of household electrical wire and connected it between ground (I used a convenient mounting bolt) and the terminal on the junction box. Hold it there for 20 sec and you're done.
Member
Joined: Jun 2017
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From: Tampa fl
Thanks again. you took a piece of household electrical wire and connected it "between ground"??? I dont get that. From where??? .... I know one end goes to the bolt but am missing where I connect the household wire to?
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From: Kaysville, Utah, US
Maybe, to be safe, you should have someone you trust and is a bit more comfortable working with these things do the procedure for you.
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From: USA
This is common practice for Jaguar owners but it's normally done at the battery. Remove the negative cable from the battery, then remove the positive cable from the battery. Touch and hold the two cables together for 20 seconds. He's just doing it at the junction box (downstream). Not sure why but the effect is the same if done at the battery. It solved his issue. It may or may not solve yours.
Veteran Member
Joined: Jun 2013
Posts: 8,946
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From: USA
Hi, when I disconnected the power cable (it may be a good idea to wrap the wire in a plastic bag or similar to avoid accidentally touching something sensitive with it), I found there was still some voltage on the terminal, due presumably to either power coming back through something else connected to the junction box, or from internal capacitance of some of the components. To ensure the voltage at this terminal is really zero, to reset the control unit, I took a piece of household electrical wire and connected it between ground (I used a convenient mounting bolt) and the terminal on the junction box. Hold it there for 20 sec and you're done.
The concept behind this is that you're trying to reset the E-Differential Control Module, actuator or temp sensor, any of which may be stuck in a loop. Touching the cables will discharge any remaining capacitor voltage and allow the modules to reset themselves.
Last edited by Sean W; Oct 12, 2018 at 09:22 AM.
Junior Member
Joined: Sep 2018
Posts: 8
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From: Houston
Grounding at the battery end will do the same thing, IF you are sure you have the right wire and IF you know there is nothing else connected to the wire that you don't want to ground. Grounding the battery terminal at the battery end will reset everything, not just the junction box at the back. This may do the trick, but if you are troubleshooting, it's good to isolate the component you suspect. Otherwise you never know what really fixed the problem.
I’ve had the steering wheel shudder on my ‘14 XKR for about a year. When I’m driving slowly, like in a parking lot, and make a hard left or right, there is a shudder in the steering. The best way I can describe it is it feels like I’m driving on ice and the front wheels are slightly skipping on the ice. The first time I felt it was last winter and I assumed the parking lot I was in had ice. I got out and looked but there was no ice. Hmmm... While it was under warranty, I complained to the dealer. The service writer had never heard of my complaint and his tech couldn’t replicate it. I even drove the tech around their parking lot but of course I couldn’t replicate it then either. Isn’t that always how it is! After doing some research, the service writer said it was normal and owners of other models had complained about the same thing. What’s odd is I swear the car didn’t do it before last year. My car still does it and it hasn’t gotten worse so I’m ignoring it.
Senior Member
Joined: Jun 2013
Posts: 181
Likes: 40
From: Pittsburgh, USA
I’ve had the steering wheel shudder on my ‘14 XKR for about a year. When I’m driving slowly, like in a parking lot, and make a hard left or right, there is a shudder in the steering. The best way I can describe it is it feels like I’m driving on ice and the front wheels are slightly skipping on the ice. The first time I felt it was last winter and I assumed the parking lot I was in had ice. I got out and looked but there was no ice. Hmmm... While it was under warranty, I complained to the dealer. The service writer had never heard of my complaint and his tech couldn’t replicate it. I even drove the tech around their parking lot but of course I couldn’t replicate it then either. Isn’t that always how it is! After doing some research, the service writer said it was normal and owners of other models had complained about the same thing. What’s odd is I swear the car didn’t do it before last year. My car still does it and it hasn’t gotten worse so I’m ignoring it.
It does sound like the same thing. It does feel like the wheels are trying to skip. Interesting it gets worse when it gets cold because that’s when I first noticed it. Thanks for mentioning it. It’s odd I drove the car about a year without noticing it. Now I notice it all the time.
Senior Member
Joined: Jun 2013
Posts: 181
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From: Pittsburgh, USA
I guessing, but maybe it's because we have wide tires and when making a sharp turn, the outside of a tire travels a greater distance then inside. Outside probably gets more traction, so the inside has to skip to match. When it gets cold, less traction and tire flex -> more prone to skipping. That's just my theory.
I’ve had the steering wheel shudder on my ‘14 XKR for about a year. When I’m driving slowly, like in a parking lot, and make a hard left or right, there is a shudder in the steering. The best way I can describe it is it feels like I’m driving on ice and the front wheels are slightly skipping on the ice. The first time I felt it was last winter and I assumed the parking lot I was in had ice. I got out and looked but there was no ice. Hmmm... While it was under warranty, I complained to the dealer. The service writer had never heard of my complaint and his tech couldn’t replicate it. I even drove the tech around their parking lot but of course I couldn’t replicate it then either. Isn’t that always how it is! After doing some research, the service writer said it was normal and owners of other models had complained about the same thing. What’s odd is I swear the car didn’t do it before last year. My car still does it and it hasn’t gotten worse so I’m ignoring it.
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From: New Zealand
My '07 XKR had exactly the same size tyres as my '10 and didn't do it so I think it is more likely that it is to do with the e-diff. I would assume that the e-diff detects that there is a large difference in speed between the wheels due to the sharp turn so engages briefly.
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Joined: Apr 2011
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From: Los Angeles
XJDanny,
There have been many posts about this in the X150 forum, I know I commented about it years ago after I bought my car about 5 years back. It's not always there but most of the time, and many XK/XKR owners have experienced the same thing. It's never gotten worse, so I just put up with it.
There have been many posts about this in the X150 forum, I know I commented about it years ago after I bought my car about 5 years back. It's not always there but most of the time, and many XK/XKR owners have experienced the same thing. It's never gotten worse, so I just put up with it.
XJDanny,
There have been many posts about this in the X150 forum, I know I commented about it years ago after I bought my car about 5 years back. It's not always there but most of the time, and many XK/XKR owners have experienced the same thing. It's never gotten worse, so I just put up with it.
There have been many posts about this in the X150 forum, I know I commented about it years ago after I bought my car about 5 years back. It's not always there but most of the time, and many XK/XKR owners have experienced the same thing. It's never gotten worse, so I just put up with it.
I’ve never noticed previous posts about it but I’m glad I saw this one. I definitely feel better about the issue (or non-issue) now. :-)
Danny
Senior Member
Joined: Mar 2017
Posts: 315
Likes: 142
From: NC
Generally three things cause the rear end shudder, to fix it do the following
1) Change diff oil, this will fix 80 % of issues IF not caused by tires
2) Tires. Tread is low and is not able to flex any longer or tire tread has gone hard and stiff. PZero's are famous for going hard as rocks after a few winters and will cause this issue.
3) Worn suspension bushings.
1) Change diff oil, this will fix 80 % of issues IF not caused by tires
2) Tires. Tread is low and is not able to flex any longer or tire tread has gone hard and stiff. PZero's are famous for going hard as rocks after a few winters and will cause this issue.
3) Worn suspension bushings.
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Joined: Aug 2012
Posts: 1,496
Likes: 630
From: LA
Generally three things cause the rear end shudder, to fix it do the following
1) Change diff oil, this will fix 80 % of issues IF not caused by tires
2) Tires. Tread is low and is not able to flex any longer or tire tread has gone hard and stiff. PZero's are famous for going hard as rocks after a few winters and will cause this issue.
3) Worn suspension bushings.
1) Change diff oil, this will fix 80 % of issues IF not caused by tires
2) Tires. Tread is low and is not able to flex any longer or tire tread has gone hard and stiff. PZero's are famous for going hard as rocks after a few winters and will cause this issue.
3) Worn suspension bushings.
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