Hi all, 95 XJS convertible, stuck in limp mode. Code reader says P1777.
Any ideas where to look? Thanks in advance, Todd

 

On further research I found that Jag issued a TSB stating that this code on 95s was indicative of a TCM failure.That explained the "limp mode" problem. The trans wouldnt shift. Stuck in 3rd. They recommend replacement with a 2400 AH 001 model TCM. I was able to find an 004 unit (XJ6) cheap and tried it.
IT WORKED! Shifts like a dream...

 

Hi!

I'm having the same problem with my 1995 XJS convertible. Just went into limp mode last night when I started it up. Ran the codes this morning and I got a P1777.

For you the problem was the TCM? Where did you find a replacement? Your help would be greatly appreciated!!

Thanks!!

 

Just bought replacement on eBay... model LHE2400AH/004. Hope it does the trick!

Please keep me updated on progress of car / if the problem comes back.

 

Hey glad it shed some light. Keep me posted as well!

 

Car working beautifully again! New TCM did the trick! Thanks for posting!

 

Good deal!
I still have to wonder tho... what made them fry?
Mine is working fine, only one week though. Updates will follow.
Did I mention, I LOVE this car?

 

Two weeks on the new TCM! Everything working smoothly! Problem solved.

 

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b4 the 3rd world takes the 2nd world