Error codes U0001, U0103 & U0101 - Dealer says trailer power drain

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Originally Posted by PhilipA

You do not mention brakes in your OP.
Does the trailer have electric brakes?
If so it could be a magnet leaking.
Regards Philip A

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Hello Philip,
Yes it does have electric brakes, with a Redarc controller. I didn't install the controller and don't know from where it gets power.
This problem originally manifested when starting the car, so the car brakes would have been be applied, potentially also energising the trailer brakes. However, in the most recent case of this fault that occurred on re-connecting the trailer well after starting the car, the car brakes were not being applied.
When mucking about with the trailer this weekend I will measure the current drawn by the brakes, at idle and when energised.
Thanks

Well, just when I thought I had a handle on this problem, everything changes!
Last night on the way home from work, and so not towing a trailer, I stopped to refuel.
On restarting it threw the same bunch of errors as before, but as it has done only twice before there were additional cascading errors, and as a result it dropped down on the suspension and wouldn't allow the gear knob to be shifted from park.
Back to square one!

On the assumption that the brake controller is permanently fitted, I would be checking the brake light feed to the brake controller. Can you unplug the controller for a while to see if the faults re-occur?

Another update, and hopefully my final post in this thread.
As suggested, I did diagnostics on the trailer electrics and checked the redarc install, without finding anything amiss.
Since then, over the last a month and a half, we have done a few trips totaling about 1000 kms while towing the trailer, plus another 1000ish kms on trips and commuting without the trailer, and had no errors.
I can't explain what caused the issues, nor why they have stopped, but am happy that some sort of equilibrium has been reached.
However, I have bought an IID Tool and will be ready to capture some relevant data if the problems recur.
Thanks everyone for your help and advice.

Hope this info may assist with extra ideas. I purchased my D4 on 30/6/2014. I had the dealer install a Red Arc Tow Pro brake controller. In Jan 2015 I got a couple of fault messages over a few days but disappeared on re-start.

On 28/2/2015 whist coming back from Sydney to Bathurst I started getting a multitude of fault messages. See attached video, (hope it works).

End result was after ringing Land Rover assist I had to get the D4 towed on a truck up to the LR dealer in Orange. This was a sad day.

Result of what was found. The technician at Orange found that the Red Arc Tow pro controller, the Earth Bolt that the controller had been attached to was not tight. All it was, was a loose Earth bolt that caused all the shown faults. Might be worth checking the Earth where the Tow Pro was attached. Never know.

Attachment 115103

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Originally Posted by Briar

Result of what was found. The technician at Orange found that the Red Arc Tow pro controller, the Earth Bolt that the controller had been attached to was not tight. All it was, was a loose Earth bolt that caused all the shown faults. Might be worth checking the Earth where the Tow Pro was attached. Never know.

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Thanks for that. Your video is very similar to the fault set I have seen a few times.
Sounds like an earthing check is needed!