If you’re sure you were measuring between pins 9 & 12 (slate & green coloured wires respectively) and you’re getting a reading below 0.2Ω then you next need to measure the resistance between the two terminals on the solenoid itself, to see if the short is in the wiring or if it’s the solenoid...

Sorry, I don’t know the answer to that. I’m sure someone else will know? Even if you don’t need it coding to the vehicle, though, the replacement ECU would still have to be calibrated to your transfer box using a capable diagnostics kit, to take account of the degree of clutch wear for the...

According to Land Rover, P0666 is either a short in the solenoid/wiring or a faulty transfer box controller. If the solenoid & its wiring check out okay, you’re left with the ECU. Good luck. Phil

Sounds like it was designed by a committee that never met :)

That’s a good point. I suspect the most difficulty you would have is when installing it, rather than removing it. When I did the teardown post shown in the link above, I managed to get the solenoid out without energising it, but it needed a lot of fiddling. That was with the transfer box...

As a short circuit in the solenoid wiring is given as a possible cause for both these error codes, it might be worth checking this out first, including testing the resistance of the solenoid itself. A resistance check between terminals 9 & 12 at the (largest) ECU connector (when disconnected...

Phil

Here Phil

Could you clarify what you mean by ‘won’t let me select drive’? Do you mean that the gear lever will not physically move to the D position, or that you can select drive with the lever but nothing happens? Phil

If it turns out not to be the battery causing the issue, it will be the inhibitor switch : Trans failsafe prog! Phil

Sorry to appear so pessimistic. I never owned a TD6 (mine was a 4.4) but from what I’ve heard the engine in it is pretty good. Shame the GM 5L40-E transmission lets it down so badly. Phil

From a diagnostic viewpoint I don’t think the issue was that it wouldn’t reverse. The issue was that you were getting forward drive whether you selected D, N or R. Assuming that the gear position indicator on the instrument panel corresponds with the selector lever position, the only reason I...

Sounds like your original issue (as discussed here : l322,td6-no reverse.) has developed further, into something even more serious. The symptoms that you’re describing now are similar to those resulting from the front propshaft spline wear problem, which eventually got sorted by Service Action...

So, before the vehicle drove forwards no matter whether you selected D, N or R but now it won’t drive at all and just makes a crunching noise? Phil

I would just check that there’s no fuse in position 37 and then put a fuse in and see if the transfer box will select (transfer box) neutral. If it does, remove the fuse again and see if the transfer box will re-select high range, then report back. Phil P.S. For the avoidance of doubt...

I think that may be a transfer box code, rather than a transmission one. Can you select low range and get back into high again? Phil

Starting with the simplest/cheapest thing first, the clamp bolt for the selector cable has a habit of seizing in its pivot hole in the selector lever (underneath the vehicle) which prevents it articulating (required as the end of the lever moves through an arc and the cable moves linearly). This...

I admire your optimism, but the manual valve (hydraulic) will override any signal from the inhibitor switch (electronic). If it were a selector cable fault, then the gear position indicator on the dash wouldn’t correspond with the selector lever position. Could be pretty much anything, knowing...

Yes, definitely worth checking that your car has had the Q041 Service Action update, otherwise it’s not surprising that the spline is wearing. Surely there aren’t any L322s left on the road, though, still running the old shaft design? Phil

For the sake of drilling the heads off 7 rivets, do you think it would be worth stripping yours down, just in case the fault is caused by dirty contacts or a broken wire? Might end up costing you nothing to fix it. Phil