Hello everyone,

I been getting this error more than a few times already in the past month. I suspect the transmission is going but I'd need to make sure before i head out to the mechanic. Here are the symptoms. If i drive nice and slow the car jerks when it shifts from 1 to 2nd. If i drive harder, the tranny shifts fine. This has also happened before, where i am driving ( in traffic) let go of the gas, and then lightly touch the gas, the car all of a sudden jumps forward like someone hit me from the back. Now on to the gearbox fault. When I have a gear box fault, there is no limp mode. its weird. The car just stays in one gear and won't switch no matter where the revs climb. I have to coast over to the side, restart my car and it disappears. Today i got the Fault just by going over a bumpy road. The other day was from accelerating to hard. Like i said, i suspect the transmission slipping. Can anyone back me up?

Thanks in advance
FiL

 

Thats weird. You might want to check the shift cable bracket on the drivers side of the transmission. Perhaps it has come loose as reported in other posts.

 

Might just need to have the tranny ECM re-flashed.

 

Check those two screws on the passenger side of the transmission where the shifter linkage attaches BEFORE you spend any money. Do not ask me how I know...

Report on your findings...

Tom

 

Thanks for all the replies guys, but I'm afraid its more serious than that. Another major thing i forgot to describe was that the car doesn't require me to apply the breaks to shift from P to R or D. I went to the mechanic, and he said it a mechanical problem with the tranny. Most likely the Clutch. The error code is P0783 description: Gear Load 3-4. Just a heads up for anyone who might have the same problem in the future. Ill update when worthwhile .
FiL

 

This is what the diag doc says about the error code:

4.7.2 Gear Load – P0781, P0782, P0783, P0784, P0829

These monitors identify excessive or reduced slip during gear changes. The excessive slip part of the monitors is caused by the engaging clutch not coming on
quickly enough. The reduced slip monitoring identifies that the off going clutch is not coming off quickly enough. These monitors run continuously as long as the
entry conditions continue to be satisfied.

When a gearshift is detected the monitor initially checks that the transmission fluid pressure and output shaft speeds are both above their required thresholds for
the monitor to run. If either is not above its threshold, then the monitor is stopped.

The level of slip is first checked against the slip high threshold. If the actual slip exceeds the high threshold then a fault present timer is incremented and the
check repeated. When the fault present timer exceeds it predefined threshold then the shift is aborted and a fault counter is incremented.

If the level of slip is below the slip high threshold, it is then checked against the slip low threshold. If the actual slip is less than the low threshold then a fault
present timer is incremented and the check repeated. When the fault present timer exceeds it predefined threshold the shift is aborted and a fault counter is
incremented.

When the fault counter exceeds its predefined threshold, the relevant DTC is logged.

 

thank you for that information veffremov.

Does anyone happen to know approximately, from experience, how much labor it would cost to take out, and install a new transmission?

Thank you

 

well im sorry but ZF trannies are about 8 grand as far as i know

 

You can probably get a rebuild for 2-3k, still not cheap though.

 

It actually is very hard to rebuild a ZF-6 most of the time they fail eventually , but yeah even a rebuilt one will be 3 grand

 

Yup rebuild is around 3-5 k with labor around here. I had a feeling it wouldn't last too long. I was offered a Transmission off of a 2005 Jaguar S type R. Would that even work? Im hoping its the same transmission

FiL

 

Yes its the same tranny its called ZF 6HP26 , even the new hyundai genesis uses the same tranny as well as Maserati Quattroporte and the all new BMW 7 series and believe or not its the very first 6 speed automatic tranny and was found in 2000.

 

Thank You for the heads up JagMaster

 

No problem mate i hope u get your car fixed soon ofcourse without selling your kidney, good luck

 

Im happy to say that I got the Jag back this week and the tranny has been rebuild. Man do i miss this car. I have to break it in nice and easy for the first 2 weeks, but it does feel faster. I don't need to apply as much throttle for it to pick up. This break in period is killing me, especially when I couldn't participate in a friendly traffic light sprint with the new Camaro SS as his girlfriend video taped my car falling behind his sprint -_- lol, ill update it when i get a chance to go harder on it, to see if everything is in working order

 

HI!

How much did you pay for rebuilt? I have the same problem with 1st -2nd gear P0781.

Thanks

 

It cost me 3700. Good luck with the rebuild.

 

How many miles were on your car when the tranny started to give you trouble?

 

the tranny had 95,000 miles. I rebuilt it and broke it in nice and easy for the first 2 weeks. It was amazing up until the engine gave out ....so my engine is currently being rebuild. I gotta hand it to jags. When everything starts to fail, it fails altogether in a timely matter. lol i still love my xjr tho

 

hi, I have a jaguar XJR 2004, Aliminium body. I have an issue with my gear box. when I have the gear stick in D it will jump out of D and when i accelerate it just starts reving like its in neutral. it jumps out of gear. i put it back into P and then back in to D and it will drive i D. what do you think the problem is??