Hello
I bought range rover L322 2003 with 3.0 TD6 for my girlfriend and low range has never been worked, i thought it is just transfer box motor but i removed it, tested and cleaned (Just like powerfuluk video) Everything seems to work in bench but when i select neutral and pull low range button it doesnt do anything. Earlier this year it did show "select neutral" text on instrument panel when car was started but now anymore.

On iidtool i read fault codes it gives
0x5230 Motor A and B off, A short circuit to ground
0x5234 Motor A and B off, B short circuit to ground
0x5238 Motor A and B open load

And TCM gives "0x99 CAN bus transfer box range error: general fault"

Instrument pack gives code 0x8D transmission interface bus fault

Is transfer box ecu toasted?

ECM gives p0380-80 Glow plug relay failure - glow relay defective and P1180-01 Low side fuel pressure sensor plausibility (fuel filter) - reduction in quanity due low pre pressure. I guess i need to change glow plugs and fuel filter also.

I changed new glow plugs and fuel filter and those engine ecu faults disappeared. But low range doesnt work and i dont know what to do.

I've got a 2nd hand transfer box ECU for the TD6 if you want to try it. I think I paid around £50 - if it fixes your problem then pay, otherwise send it back to me. But the problem I had was the transfer box motor. Got a recon one where the internal sensor has been replaced with a new improved design - think the chap sales on eBay now. Send me a PM if interested.

How did you get on replacing the glow plugs by the way? Were they a pain to remove?

Removing intake manifold. It is quite easy. 4 of them was easy but 2 just unscrewed bolt off and core of glow plug stayed. Then i left it running and did few drive arounds and they popped out.