Automatic Gear Box advice needed plz!
 

Hi there


I have a 2004 X5 Diesel Automatic that has done about 200k miles.


The other day i was driving and then the car went into limp mode. After i stopped, the car cooled down and it started as normal again.


When i got home i connected my diagnostic computer to the car and I got this error -


Fault Code 005088
EGS Sensor Transmission Switch L1 - L4
DTC = P0705
(Transmission Range Sensor A Circuit (PRNDL - INPUT)

So I have few questions for anyone that can help me please?


1) Do I need a new range switch or can i clean my existiing one?


2) I know that i need to change the gear box oil and filter, would it make sense to change the solenoids at the same time or, can i test and clean them using an ultrasonic tank etc?




Any help and advice is greatlly appreciated.


Thank you.




PS... My gear box is a GA6HP262 unit

A good scanner will show you the L1-4 lines real-time so you can tell if the readings are getting from transmission to the egs.

When my 3.0i acted like your symptoms was just dirty water in the connector to the transmission.

When you shift does the gear position reliably update on the dashboard? Mine would show nothing some times and other times show impossible gears like 54.

My understanding is the XM is different on the diesel but I'm hoping for your case that the selection switch is external like the v8 and you could take apart and clean the contacts which is what i was about to do on mine when i found the dirty plug.

https://uploads.tapatalk-cdn.com/202...4c173d050e.jpg
https://uploads.tapatalk-cdn.com/202...28464a53a6.jpg


–awr–

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Thank you for you reply.

So, when i change gears from P to D the the numbers on the dash board all correspond correctly.

If i then use the gear box like a manual and move from 1, 2, 3, 4, 5 and 6 everything works correctly and the numbers are fine.

I will look under the car to make sure that the connector is okay and there is no corrosion there.

Thank you

Check the connector at the TCM/EGS in the ebox also. And the wire loom that goes down the firewall.


–awr–

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Sorry, where is the TCM and the other part..?

EGS aka TCM is in the e-box at the firewall. It's under the cover at the leading edge of the windshield


–awr–

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On this later ZF 6HP26 transmission, the EGS is inside the transmission itself.... as is the range switch.

Once the tranmission Oil pan has been removed. Would it make sense to replace the solenoids? My car was made in 2024 and has done over 200K miles.


Is there a way of cleaning the solenoids, like car injectors?


Thank you

You could test each of the four Hall sensors. Failure of one or more of these is a common cause of the P0705 issue with the 6HP26/28.

http://www.landyzone.co.uk/land-rove...faults.397154/

Phil

I would do a full service. I serviced the transmission of my 2005 4.4 last year May at around 170k miles with absolutely no issues. It continues to shift like new. Note that I changed much more than just the fluid and filter- the solenoids, seals, mechatronic separator plate, trans damper pistons were changed, and a thorough cleaning was done. You can get away without changing the trans damper and the plate, but I did them any way since I was already there and the parts are not expensive. The 4 drain/refill/drive cycles I did really cleaned up the transmission. When I finally opened it up it was really clean. I think just changing the fluid and filter for the first time on a high mileage trans may not be a good idea.

https://xoutpost.com/bmw-sav-forums/...success-4.html

I think you are correct. Considering that my car has high milleage it would make sense to change the trans oil, filter and then the seals too.

At the same time, i could check the solenoids and replace them if needed.


Thank you

Given that you need to remove the mechatronics unit from the transmission to address your current range position switch issue, you are pretty much committed doing all that anyway! ;)

And it looks like repairing the range position switch is going to be quite the task... :rolleyes:



https://youtu.be/lEF3PDBAhqc?si=Zb6vRVQ-Okwq7OyH

As the position switch is a hall sensor the sliding surfaces are magnetic and just the debris over the years can disable it. So just removing and cleaning it might cure it. But of course when the mechatronics is on the table you should check the components and be prepared to renew things if needed. Easier done if you have a possibility to have the vehicle standing for a while.

[emoji106]

Yes! There is a at least a 50% chance cleaning will allow the position switch to work again.

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Yes, i think the common sense approach would be to start with a good examiniation of the part, clean it and if it needs to be replaced, then i will replace it.

Yep, clean it but not sure how to test it while the trans is open. This is what mine looked like although there were no issues. You don't want to open the transmission again if it still doesn't work.

RRPhil outlined the test method in the link in his post on page 1 of this thread... ;)