Intermittent Gearbox Fault

Don't mess with it and take round to yer local Jag mechanic right away before ya blow the hell out of it and you'll be up for thousands of $ instead of a coupla hundred.

You need the transmission fault codes read, but I suspect you will need to rebuild the transmission.

Have the fault codes read. Replace faulty items. Use only genuine items as non-genuine replacement are not always compatible with the OEM fitted CPU units. check oil level on dip stick and make sure it is correct

You are now in Limp Mode - the gearbox is kept this way to allow you to drive the car to a repair shop. Nothing more you can do, a part failed in the gearbox and it must be replaced - dismantling of the gearbox is mandatory.

the ecu is damaged. take it to the dealer. you MUST be very careful when jumping these vehicles.

Most probably you have a problem with the electronic map for the selector which is the part under the selector lever

Hello jjames696...The gearbox fault light has come on because the transmission control module (TCM) has received a fault signal from one or both of the two trans. sensors....The Output Shaft Speed (OSS) Sensor and/or Turbine Shaft Speed (TSS) Sensor.The TCM has now defaulted to limp mode...A diagnostic scan needs to be run...An OBD II scanner will retrive a P1722 fault code, the only code in it's library for the ZF5HP24 transmission. The WDS / IDS will pull other codes not found in the standard OBDII library (dealer or good transmission shop)
When was the last time the transmission was serviced? Manual shifting will take it's toll on the fluid quickly.
The transmission is sealed, no dipstick (which i think is a bad idea) You can check the fluid level by removing a plug on the passenger side of the case, you should be able to touch the fluid with your finger. Jaguar fluid is VERY expensive, Mobil 1 synthetic will work and meets ESSO specs.
Personally...i would change fluid every 25-30k.
Hopefully all you have is a bad sensor or a stuck solenoid and no internal componet damage.
Good luck, hope this answers your question...please take time to rate my fixya reply.

Replace transmission and sell quickly. I bought 2001 s-type in October 2008. I have not been able to drive it. 1st thing was gearbox fault message which turned out to be transmission. Ford can rebuild cheaper. Next thing to happen was all seals needed replacing. Then all coils needed to be replaced. Coils keep going out. Needs new computer which has 8 year/80000 mile warranty on, but Jag would not honor ($3000). Needless to say my pretty jag sits in the driveway. Had to get another car. Went with Lincoln LS V8. GREAT car!

If the transmission is still operating ok, you can drive it, but you need to get it checked, since a fault has been detected by the transmission computer.

Bret
RepairPal.com

There is a special additive lubricant for gear transmission to solve this problem. Just add on to gear oil. I had the same problem. now ok.

Rajapal, Malaysia