Question about 2001 Jaguar XJ8
I have a 2000 xj8 VDP with 85000 mi. The Gearbox Fault light came on and it wont upshift or downshift. It only moves forward under high rpms. Cause? Thanks
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.
Posted on May 25, 2009
Hmm, there are many factors involved, and what you provided in information is not nearly enough to consider all of such factors to determine the exact cause.
For example, what's the ambient temperature? If it's really cold, the gear may move forward only after having the engine warmed up. Cold weather may affect the shifting of gears as noted in this diagnostic article:
Other considerations as to your "upshift or downshift" inoperability is found in this article:
This is all that I can offer with the limited info you provided; wish I were there to see for myself. Hope this helps. Brad
Posted on May 25, 2009
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Posted on Jan 02, 2017
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