XJ XJ12 ( X305 ) 1995 - 1997

Tranny Trouble

 
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Old 03-25-2014, 10:13 PM
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Default Tranny Trouble

I put the scanner on and read 0776, 0776 pending, 1000, 1775. It is a 1996 XJ12, a long body. Cleared the codes and started the car. It immediately came back with 1000 and 1775. I live in central Oregon so Jag mechanics are really hard to come by. The scanner says the 0776 is something about a B valve. Hmm, probably time to sell . Want to buy? Make an offer!

Thanks for reading my post. Any help would be greatly appreciated.

Dennis M.
 
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Old 03-25-2014, 11:01 PM
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Perhaps "B Solenoid"?

The "A and B Shift solenoids" often give trouble, as to the front and rear speed sensors. For about $120 or so you can buy all four parts. A bit of a messy chore as the pan has to be dropped...but perfectly DIY-able. As guesswork repairs go it isn't hateful, at least in terms of parts expense.

A better first step would be to carefully examine the wiring and connector at the transmission. A weak trans mount can allow the transmission to move up-down too much, over-stretching the wiring, causing damage. Fairly common problem.

Cheers
DD
 
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Old 03-25-2014, 11:03 PM
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I meant to add that if you don't want to DIY the type of work I just mentioned is routine for anyone familiar with GM transmissions. A Jag specialist is not needed.

Cheers
DD
 
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Old 03-26-2014, 02:52 AM
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Don't worry about P1000. That only means the drive cycle is not completed. When it is, P1111 will display. Then it will be ready for emissions testing (as long as Check Engine light is still off).

I concur, tranny sensors and solenoids go foul. I plan on doing my own, although for now I don't have a problem other than a delay when engaging drive.

You can use the Private 'for sale' section on the forums here, if you really want to sell. Keep in mind that wherever you advertise, you will face a much harder sale if there is a driveability problem. Truth is, these cars are not easy to sell even when they run great. There is simply not a lot of demand for them. Most shy away due to the urban legends of the Jaguar V12. I suppose some of those legends are true, although NOT for the last generation XJ12!
 
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Old 03-26-2014, 11:19 AM
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I appreciate the help. It doesn't sound that bad. I am going after the wiring first. The transmission was replaced about 40K miles ago and it occasionally has done some odd things associated with the electronics. The car runs great though and I really want to keep it.

Thanks again.
 
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Old 03-27-2014, 03:15 AM
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Ok! There are so few of these cars on the road, and they all need someone to care about them and keep them on the road. Looks like that's you and me! This last gen XJ12 is somewhat of a novelty, but certainly a terrific way to travel.
 
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Old 03-13-2017, 04:53 PM
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Default X305 Transmission Pan Removal

I found that in order to access the external speed sensors, the harness connector, or to drop the transmission pan, the exhaust needs to come down. Oh, dread!!
I decided to cut the pipes at four locations using a sawzall- just aft of the front downpipes and at the rear about 3" ahead of the rear center hanger. I bought four 3 bolt flange kits (Google Patriot H7258) and welded those. I tacked them securely with the exhaust held in position, then removed it all to finish half of the welding on the floor. If you are using MIG, be sure to attach the ground clamp to each of the four flanges on the car so you don't send voltage surges through the chassis and electronics!
The rear O2 sensors must be unplugged prior to the drop, but are easy to unplug by dislodging the rubber grommets and pulling the two harnesses out of the floor until the connector can be undone.
Once this mod is complete, dropping the whole center of the system is a 15 minute job, but a helper is useful.
Once this assembly is out of the way, access is significantly improved. To access the rear harness connector you still have to support the rear of the trans and remove the rear mount.
Almost nothing on this car is easy to access.
 
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Old 03-13-2017, 04:58 PM
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Smile X305 Transmission Pan Removal-Addendum

I cut the front pipes just aft of the front cats. Try to cut 90 degrees to the pipe, and pick a spot that leaves room for the flanges and to weld them in.
A rather tedious process but sure worked well for me.
 
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