Transmission in limp mode, light on

SOURCE: Warning icon and diagnotic message came on ''Failsafe Mode''

It sounds like your Throttle Position Sensor (TPS); located in the throttle body. (Diagnositic test may point to alternator or TPS; I experienced the same issue and although replacing an alternator is easier on the pocket book, it doesn't correct the problem; which will get worse.)
(My story) The amber transmission light would pop up; after a restart, it'd go off. Eventually this led into the engine dropping into safety mode (15-20 mph); while driving city/highway without fail everytime; inbetween driving distance became less and less. (prior to this I had taken my car in several times; each time they reset the computer and $$replaced my alternator, as suggested by my mechanic).
As soon as I drove it off the shop to my house, it dropped into safety mode; amber warning lights. Drove it back to the shop; had to replace the throttle body (the only way to replace a bad TPS). It can co$t anywhere from: $1700.00-$2,000.00 parts and labor. Shop around; because my shop diagnosed the problem part wrong, I got a deal (but it still cost me...). Since I had it replaced (April 2008), I haven't had a problem since. Jag Heaven (a parts company located in California) can ship parts anywhere; it was cheaper to do this than buy the part from my shop $aved $$$. Good Luck, hope this helps...

SOURCE: Transmission Fault

You can get a rebuilt transmission, including repair it will cost you about $3-4k. I had the same done to mine.

SOURCE: Limp Mode

the check engine light will be on 

Marvin

• 85242 Answers
• Posted on Jun 05, 2009

SOURCE: 99 jaguar transmission code p1722

This code is an indication that the transmission has excessive slippage, the code is for the input and output turbine speed sensors, based on what i know of this problem the trans has a mechanical problem, that would be low fluid pressure or worn out forward clutches, make sure the trans fluid is not low, if it is ok you will need to have the trans torn down for inspection..

SOURCE: 99 Jag xj8l stopped shifting low gears, only goes in high gear.

You will need to have your tranny rebuilt or get a replacement. As a mechanic myslef, I have seen this a few times in the Jag XJ series. Those people eneded up having tranny replaced as well.