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XJ ( X308 ) XJ8 / XJR 1997 - 2003

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  #1  
Old 07-13-2010, 09:30 PM
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Default Jaguar xj8 transmission problem

i have a 2000 jaguar xj8 that seems to be stuck in 4th gear. it goes in reverse fine but when you put it in drive it revs up to about 2000 rpm and then jerks reak hard and drives off very slow. it also says gearbox fault when the car jerks. i scaned it and got the following codes 1646,1647,0706,1722,1000. is this something inside the transmission or something with a computer?
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Old 07-13-2010, 10:55 PM
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yah, seen some of those codes before, when doing your research, consider looking in the XK8- XKR area also, as the transmissions and engines were identical for several years. R versions excluded, of course.

Search for P1646

Search for P1647

Search for P1722
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  #3  
Old 07-14-2010, 12:57 AM
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Same problem/codes with mine last year... sorry, required a rebuild - 'A' drum broken along with several other issues.
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Old 07-14-2010, 04:45 PM
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What other issues did you have? Did you do the repair yourself or take it somewhere?
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Old 07-14-2010, 07:39 PM
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Had it repaired by a local transmission shop that happened to have a guy who specialized in Jags. Other issues were valve body related - several valve body pistons had worn into their respective aluminum cylinders (a common problem, I was told). All were replaced, cylinders sleeved with brass and they replaced any other hard parts that showed any wear. Total cost was about $3500.
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Old 07-20-2010, 11:41 PM
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Default Gerabox fault

Quote:
Originally Posted by 1bimmer3 View Post
i have a 2000 jaguar xj8 that seems to be stuck in 4th gear. it goes in reverse fine but when you put it in drive it revs up to about 2000 rpm and then jerks reak hard and drives off very slow. it also says gearbox fault when the car jerks. i scaned it and got the following codes 1646,1647,0706,1722,1000. is this something inside the transmission or something with a computer?
Hi Bimmer3
Just read your issue regarding the transmission, my 1998 xj8 200k's has just done the exact same thing, and you have asked the axact same questions i have. what responses did you get and have you sorted the problem?
Regards
John
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Old 07-21-2010, 11:44 AM
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I've been doing some research on this from a bunch of websites and I'm almost 100 percent sure it's the a drum. I'm still looking around at different websites just to see if there's anything new but I think I'm going to pull the transmission when I get a chance and have a look at the a drum and see if I can fix it.
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Old 07-22-2010, 12:03 AM
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I am almost reluctant to offer this sollution, but once again, it could be electrical. One time after replacing my battery, the transmission was acting really odd. when slowing down to come to a stop at a light, the transmission would clunk really badly, always at the same speed. I disconnected the battery again, fully charged it, held the negative lead to the positive terminal (with the positive terminal connected --a "hard reset" of the computer), reconnected the battery and never had the problem again. Every time I have a problem with my Jag, the first thing I do is do a "hard reset" of the computer to see if that solves the problem. It has solved many ills.
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Old 07-22-2010, 02:55 PM
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Had the problem about a year and a half ago and sorry to say it requires a rebuild.
Dan
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Old 07-22-2010, 03:40 PM
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I tried the hard reset and it still has the same problem. I'm going to pull it out when I get a chance and look around see if it's the a drum. If anyone has any tips or pointers about working with these transmissions let me know.
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Old 07-22-2010, 04:11 PM
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the xk8/R FAQ thread has some 5hp transmission documents that may help you. Go down to 'transmission' to find them
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Old 02-24-2011, 06:50 AM
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Default Transmission noise

I own a 2000 xj8. The transmission A drum failed a common thing I was told. I had a local transmission shop overhaul with updated A+B drums. It shifts fine but now chatters in the morning when cold and has a humming noise at 50 to 55 mph in drive mode. But when shift to sport mode goes away. Transmission place says transmission is fine and is very common problem with no repair fixes. Can anyone help me? Thanks
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Old 02-24-2011, 07:05 PM
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Chris,
there's a whole thread dedicated to the transmission hum from 50-55mph in normal mode.

2002 XJ8 "humming" noise at 52-55mph

To be honest, I'm quite reassured by your post as your transmission shop is the first authoritative source to say its "normal" and not a sign of impending doom.
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Old 02-14-2013, 04:50 AM
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Help.. I have a 2000 xj8 128000 miles.. when in reverse it feels like slipping clutch, car moves off very slowly, however all is normal in drive. Any ideas or is it time to get rid, the car itself is only worth 2000. Thanks
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Old 02-14-2013, 05:10 AM
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that sounds like the main control valve issue, which leads to A drum failure. It will eventually lead to a failed gearbox and display 'gearbox fault'.

It can be fixed with a valve block rebuild, the choice is yours....talk to a transmission specialist on prices for this fix. With a knackered trans it's worth 400 quid....
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Old 02-14-2013, 05:45 AM
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Quote:
Originally Posted by 1bimmer3 View Post
i have a 2000 jaguar xj8 that seems to be stuck in 4th gear. it goes in reverse fine but when you put it in drive it revs up to about 2000 rpm and then jerks reak hard and drives off very slow. it also says gearbox fault when the car jerks. i scaned it and got the following codes 1646,1647,0706,1722,1000. is this something inside the transmission or something with a computer?
P1646 & P1647 are the failure codes for the heater elements on the upstream O2 sensors-they burn out after high mileage & throw up the engine check light. The engine ECU adopts a 'basic' fuelling map & fuel consumption goes up by around 15%.

P0706 & P1722 are transmission fault codes & consistent with the fault symptoms you are getting.

P1000 is not an actual fault code & simply means the system has not yet completed it's 'drive cycle' tests satisfactorily-which it can't do now with the other fault codes you've got.

Regarding the transmission, the first thing to do is get the valve block checked-it's not that hard to remove & doesn't require a complete transmission removal. There's plenty of information on this forum about this issue, which is really starting to rear it's ugly head now with numerous posts about 'A' drum failure now appearing

Get the valve block checked first-if that doesn't cure the fault then it looks like the dreaded 'A' drum failure, which will require a transmision removal & overhaul.
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Old 02-14-2013, 05:45 AM
 
 
 
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1000, 2000, 2003, 4th, code, failure, forum, gearbox, jag, jaguar, problem, problems, slipping, stuck, transmission, xj8



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