P1601 fault XJR
Discussion
Hi all.
Twice I've had a 'gearbox fault' come up after driving slowly down hill. It's very intermittent, it hasn't happened in the last 500miles. The error code is P1601 ECM/TCM Serial Communication Error. Is that...bad...?
The car is a '98 XJR (so I think it has the Mercedes gearbox) I've heard the TCM can be an issue in these cars. Both times I've switched off/on and it's been fine afterwards.
Also I want to haver the gearbox oil changed. Any suggestions/tips? Where should I get the oil from, for example. I know a local Merc/Jag specialist I was going to take it to them to have it done, they should know how to do it!
Twice I've had a 'gearbox fault' come up after driving slowly down hill. It's very intermittent, it hasn't happened in the last 500miles. The error code is P1601 ECM/TCM Serial Communication Error. Is that...bad...?
The car is a '98 XJR (so I think it has the Mercedes gearbox) I've heard the TCM can be an issue in these cars. Both times I've switched off/on and it's been fine afterwards.
Also I want to haver the gearbox oil changed. Any suggestions/tips? Where should I get the oil from, for example. I know a local Merc/Jag specialist I was going to take it to them to have it done, they should know how to do it!
Tame Technician said:
Means the TCM and ECM aren't talking to one another.
Open up the cool box and see if the ECU's are underwater or any obvious wiring fault.
The cool box? I'm not sure where/what that is, I presume it's where the ECU lives. Water would kind of make sense, it did happen after going down hill.Open up the cool box and see if the ECU's are underwater or any obvious wiring fault.
Bigish black plastic box contains both engine and Gearbox ECU's. + a cooling fan hence coolbox.
Under the bonnet, near side of the car at the back.
http://www.eap-direct.com/11421556_8X.jpg
Look at that pic, OK its not an "R" & its a left hooker so its the sides are reversed but its all i could find.
See where the brake fluid cap is on this left hooker. Thats where the ECU's are on yours. removed the plastic trim, one screw IIRC, and then you can see the box, think theres a small fuse box in there too, just ignore that, your looking at the bigger box.
Has tamper proof screw which are a pain, but a large flat bladed screw driver and alot of downwards force and they will come undone.
Under the bonnet, near side of the car at the back.
http://www.eap-direct.com/11421556_8X.jpg
Look at that pic, OK its not an "R" & its a left hooker so its the sides are reversed but its all i could find.
See where the brake fluid cap is on this left hooker. Thats where the ECU's are on yours. removed the plastic trim, one screw IIRC, and then you can see the box, think theres a small fuse box in there too, just ignore that, your looking at the bigger box.
Has tamper proof screw which are a pain, but a large flat bladed screw driver and alot of downwards force and they will come undone.
Edited by Tame Technician on Tuesday 20th October 22:08
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