Have received what appear to be common msgs ---trans fault, restricted performance, parking brake fault and cruise not avail while driving my 2005 S-type 4.2 w/75K miles. Seems to occur within 5-8 miles of start of trips in Central Maryland. Upon restarting engine, msgs disappear and all well. Suspected battery voltage was low, and indeed, it was, so replaced 5 yr-old Interstate with a 900 cca bty fm AAA. No fix. Respected indie Jag mech then searched and searched but nothing specific found. Battery tested proper voltage avail. 2 codes present (P1643 and P1797) for several control modules. Cleaned a ''dirty'' connector assoc w/trans. Drove home (approx 20 miles) with no msgs .... even did an errand (stop/start engine). HOWEVER...car now refuses to even try to start....dead silence as msgs rotate thru screens. Put on charger overnite to top-up battery but no improvement.
Have disconnected battery for 15-20 min in hopes controls will re-set but no change. Any ideas for a novice???

 

Battery and charging it - good. Usually solves things. Sadly not always!

If you clear the codes do they come back very quickly?

You might check the 2 bolts on the trans side for the shifter cable are snugged up just to be sure, but what you have looks to be an electrical problem, maybe a bad connector or chafed wire(s).

The free download of JTIS has the Electrical Guide plus how to test wiring etc.

 

I have similar issues, how did you resolve / fix the problem.

 

After several months and that was the OP's only post, you can be fairly sure not to get an answer from him/her. Try following my previous post...

 

Fol-Up to P1643 and P1797 error codes. Lived with 05 S Type V-8 (80K miles) going to limp mode and showing transmission or gear box fault, parking brake fault, restricted performance and occasionally Cruise not avail for many months. Faults were showing up within 2 miles of initial start of day; wait 10-15 min and restart and all OK for rest of day, but was becoming a pain. Finally let Mike Raup of English Auto in Odenton, MD keep car for a few days and he narowed problem to connector sleeve on transmission not locking properly. Put on a new one and, knock on wood, have not had problem reoccur after starting/driving for 2 weeks.

 

Thanks so much for the follow-up. Way too often somebody asks about a problem, we do our best to help, but then we never hear back what did or didn't work.

A big tip of my orthopedic hat to your mechanic for finding the problem. Do you have any more details on the repair? This is an external electrical connector, right? I scoured eBay hoping to find a similar transmission for a look at the connector(s), but came up blank.

The reason I'm asking is other than the two specific fault codes you listed, the other messages are VERY common on 2003+ cars. One common cause seems to be a marginal battery, so that gets suggested a lot. While that often seems to take care of it, there's still a good percentage that still keep getting the messages. So if you have any more details of this connector, or if anybody else is familiar with it, we'd love to hear more details for future reference.

 

It's the (in)famous ZF electrical sleeve I reckon. I've encountered the P1797 before...

 

Ah, thanks, is this is?:

https://www.jaguarforums.com/forum/s...ics-faq-30991/

I haven't read all eleven pages yet. Lots of talk about the correct fluid and pan bolts.

The sleeve itself? Is that where the wiring passes from the transmission interior to the outside? From a quick readthrough, that thread seems to be mostly about fixing a leak. Does this repair also apply to an electrical problem?

Hope I'm not bugging you too much with all these questions. I don't have the ZF transmission, just trying to get a handle on it to help in the future.

 

There are a few threads but I think what can happen is the pins don't mate properly somewhere / fluid gets in or some such.

P1797 is a CAN connection (timeout) problem between TCM and PCM.

 

Some people have not got the sleeve seated properly and had problems.
The sleeve is inserted from inside the box so the pan needs dropping to fix it.

 

The normal mode of failure is the sleeve starts leaking. Almost all electrical problems come from incorrect install of the sleeve which if not fully seated causes problems with the electrical plug as was found.

What color were the O-rings on the sealing sleeve that was removed? The updated ones come with orange O-rings while the factory sleeve has black O-rings.

I would bet the sleeve had been replaced before (improperly) but it's just a guess at this point.
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