Hi to all, ( this is a long post!)
I have a 1999 XK8 (same setup as X308) with a gearbox fault,
which I believe to be electronically, not mechanically
related. If you could point me in the right direction or to
an existing archive post would be greatly appreciated. Here
is a list of symptoms and fault codes:
Symptoms in order:
-start car and all is normal
-put in ‘‘D’’ and nothing happens
-revs up to 2000 rpm and a ‘‘clunk’’ occurs, and car is in
limp gear displaying ‘‘Transmission Fault’’
-will drive in limp gear
-switch over to to manual mode, up to ‘‘2’’, and back over to
‘‘D’’ and two things occur at once:
-the red LED lights on the J-Gate go out and never re-appear
and the readout now alternates with ‘‘Restricted Performance’’
-will still drive in limp gear
-shut off and restart, everything is perfectly normal,
select ‘‘D’’ and the whole thing starts all over again
P0706-Rotary Switch and/or D-4 switch malfunction
P1722-Gear 2 Incorrect Ratio OR
transmission stall speed failure
P1797-Neutral Switch Circuit Malfunction OR
CAN TCM/ECM Circuit Malfunction
P1799- Hold Switch Circuit Malfunction
I have noticed that these codes usually point to one of four
-The micro switches inside the J gate.
-The rotary switch attached to the gearbox.
-The rotary switch connector block on the engine side of the
I took the assembly partially apart to be able to see the
micro switches and they are all aligned properly.
Any advice or thoughts would be REALLY appreciated!!
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