My next adventure-P1642 & P1797
#1
![Default](/forum/images/icons/icon1.gif)
P1642 & P1797.....As best I can tell, both these faults have to do with a short circuit, or bad ECM or TCM.
I was just driving around town, and the dash lit up, along with the trans going into limp mode.
I have the brake light on, traction control failure, Transmission failure, and restricted performance messages, along with the check engine light.
I have physically checked for the harness rubbing anywhere. I read and was told that the TCM could cause all of this to happen, and they are known for failure.
I have a used TCM coming, but will I need to have it flashed at the dealer, or is it self learning?........Boy do I hope this solves the problem.......Convertible weather is here!
Now is not the time to be driving an X Type sedan........Thanks.......Mike
I was just driving around town, and the dash lit up, along with the trans going into limp mode.
![Icon Pala](https://www.jaguarforums.com/forum/images/smilies/icon_pala.gif)
I have the brake light on, traction control failure, Transmission failure, and restricted performance messages, along with the check engine light.
I have physically checked for the harness rubbing anywhere. I read and was told that the TCM could cause all of this to happen, and they are known for failure.
I have a used TCM coming, but will I need to have it flashed at the dealer, or is it self learning?........Boy do I hope this solves the problem.......Convertible weather is here!
![Icon Redcam](https://www.jaguarforums.com/forum/images/smilies/icon_redcam.gif)
#2
![Default](/forum/images/icons/icon1.gif)
All those faults occurring simultaneously make me think low voltage. Have your battery load tested and alternator checked.
I haven't seen any mention of TCM failure on this forum, so I don't know where you got the info that it's a common problem. If you have a matching VCATS number TCM it might be plug and play but it would not surprise me if a reflash was required.
I haven't seen any mention of TCM failure on this forum, so I don't know where you got the info that it's a common problem. If you have a matching VCATS number TCM it might be plug and play but it would not surprise me if a reflash was required.
#3
![Default](/forum/images/icons/icon1.gif)
All those faults occurring simultaneously make me think low voltage. Have your battery load tested and alternator checked.
I haven't seen any mention of TCM failure on this forum, so I don't know where you got the info that it's a common problem. If you have a matching VCATS number TCM it might be plug and play but it would not surprise me if a reflash was required.
I haven't seen any mention of TCM failure on this forum, so I don't know where you got the info that it's a common problem. If you have a matching VCATS number TCM it might be plug and play but it would not surprise me if a reflash was required.
Being on disability kinda puts a crimp on me even going to an independent, so I do with what I read off of Google, and this forum.
It initially happened suddenly, while accelerating down an on ramp(it jerked 3 times), about 20 miles away,(that is when the check engine light went on)on my way home. It didn't go into trans limp mode until I was about 2 miles from my house. I have been getting a failsafe mode message about twice a week, for the last few weeks, so I kinda think something was in the works.......
Who knows though.....These cars are so electrically over engineered it can be anything....Any other ideas are appreciated......Mike
Last edited by mrplow58; 05-04-2016 at 11:17 AM.
#4
#5
![Default](/forum/images/icons/icon1.gif)
Not sure if the 1999 would be the same as my 1997 but ................
I had identical issues and I'm pretty sure it was due to problems with the J Gate. On my car, there are three small microswitches which are operated by movement of the gear lever. Each has a metal lever - like the top right here :
![My next adventure-P1642 & P1797-j-gate-microswitch02.jpg](https://www.jaguarforums.com/forum/attachments/xk8-xkr-x100-17/129314d1462382436t-my-next-adventure-p1642-p1797-j-gate-microswitch02.jpg)
On my car, the years had taken their toll and two of the metal levers had fallen off. I replaced the levers, and since then (touch wood) - all has been good.
Of course, it could have just been disconnecting and reconnecting the plugs that solved it.
But - the CAN goes trough the J Gate, so a good (and cheap) place to start !!
I had identical issues and I'm pretty sure it was due to problems with the J Gate. On my car, there are three small microswitches which are operated by movement of the gear lever. Each has a metal lever - like the top right here :
![My next adventure-P1642 & P1797-j-gate-microswitch02.jpg](https://www.jaguarforums.com/forum/attachments/xk8-xkr-x100-17/129314d1462382436t-my-next-adventure-p1642-p1797-j-gate-microswitch02.jpg)
On my car, the years had taken their toll and two of the metal levers had fallen off. I replaced the levers, and since then (touch wood) - all has been good.
Of course, it could have just been disconnecting and reconnecting the plugs that solved it.
But - the CAN goes trough the J Gate, so a good (and cheap) place to start !!
#6
![Default](/forum/images/icons/icon1.gif)
I give up! I cleaned the grounds in the trunk, sprayed some contact cleaner in the plugs of the ECM and TCM, did a hard reset, and still had the codes.
It drove flawlessly for 30 miles, even with the check engine light on, and I pulled over for fuel. I started the car back up, and the check engine light went out.
I trust this car about as far as I can throw it, yet I still really dig it. She is kind of like a hot girlfriend, that causes you grief all the time. Do you keep her, or does there come a time when enough is enough? I haven't reached that time, but I know this girl is not good for my emotional health.
I had a hot girl like her before, and married her. After 39 years I still know she is not good for my health. I will keep you apprised of what is happening, but having the check engine light go out just before I turned into the Jaguar dealer tells me she wants me to keep her.....IDEAS????........Mike
It drove flawlessly for 30 miles, even with the check engine light on, and I pulled over for fuel. I started the car back up, and the check engine light went out.
I trust this car about as far as I can throw it, yet I still really dig it. She is kind of like a hot girlfriend, that causes you grief all the time. Do you keep her, or does there come a time when enough is enough? I haven't reached that time, but I know this girl is not good for my emotional health.
I had a hot girl like her before, and married her. After 39 years I still know she is not good for my health. I will keep you apprised of what is happening, but having the check engine light go out just before I turned into the Jaguar dealer tells me she wants me to keep her.....IDEAS????........Mike
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)