I have a 2007 Range Rover Sport L320, and I have had a problem with my air suspension. I ran a diagnostic on it, and I came back with U0132-87 fault codes, which said it could not communicate with the ride-level control module.

I thought the best way to deal with it was to eliminate possible faults, starting with the fuses. However, I found a problem that left me confused.

I used a circuit tester to check in the fuse box next to the battery, as it's a lot easier than pulling them all out one by one. They all work fine and there are no blown fuses apart from F3, F15, and F18. Well so I thought. When checking the fuses they did not look like they were blown so I changed them anyway. Yet they still did not work. I removed them and checked the voltage directly and there was nothing. Them three terminals are completely dead.

My question is this, is there another fuse/relay that could be blown and its causing them not to work? Is there a problem with the wiring somewhere else (I did have the passenger footwell leak recently). Or has my fuse box and ill need a new one?

Any ideas of suggestions would be greatly appreciated.

There has been numerous posts about corroded wire joints/splice's in and around the passengers footwell, if you have had water ingress issues in the footwell that could be part of the problem, not saying it is as only a suggestion.

Cheers
Col

Thanks for the response. If there’s one thing I didn’t want to have to do, it was go through the wiring, but I guess it can be the only logical explanation as to why these three are not working. I guess I’ve got to pull up the carpet and see what’s what. I’m hopeful that because the wet area was confined to one area if the wires were damaged, they would be in that area and not somewhere hidden.

Sometimes you can ignore U codes, it depends what sort of fault you have.

What problem are you having ?

The suspension warning light is on (it is red). The front has dropped to the bump stops and won't move. There are no leaks or problems with the sensors. I went to the car one morning, and it was like this. After running a diagnosis, I only get the U fault codes but can't access the system to try to recalibrate or raise it. After finding the fault with the fuses, one of them (F3) being for the air suspension, my presumption is that is why it won't work.

F3 will only have power when compressor running

F15 & 18 is heated windscreen on my year, and will only have power when that is on

A "Lost Comms with RLM" means another module cannot communicate with said RLM

Can your code reader access and read codes from the RLM?

sometimes with a red light, you can jack the car up few inches at front or rear or both (whereever very low), and then turn the igntion on. If the red light has gone, and you only have a yellow, try starting the engine and shut the doors

(Mike is likely more on track, if that is the only code you are getting)

or look at the colour LCD 4x4 discplay, and see if one wheel/corner is different. jack that corner up


or program the KEy LR button, to raise suspension and try that

That's interesting to know because I no longer hear the compressor. Before this issue, I did hear it. There was nothing when I removed the fuse in F3 and tested it with my voltage connector. Is this because, as you say, there will be no power going to it at all unless the compressor is running? The other codes say the same as yours: heated windows; even with the engine running, I get nothing. Is there a way to test if the compressor is knackered and I need a new one?

Unlikely to be the compressor in this case.

As mike, says, can your code reader talk to the suspension ecu

When I go to access the air suspension setting this is all I get. I also took it to a friends garage who deals with Range Rovers and his diagnostic tool couldn't even connect. I'll add a couple of photos so you can see the U codes thrown up.

Last edited by LiamG79 on Tue Apr 01 2025 9:44am. Edited 1 time in total

I have tried uploadind pictures but they are not showing.

My code reader cannot speak to the suspension ECU. When I try to access it, it keeps saying "communication error with ECU." Confirm whether the diagnostic is connected correctly (it is) and whether the ignition switch is on (it is). I can access everything else on the car. The moment I want to access the suspension features, I get that message.

In that case, you've an issue with the RLM or associated fuses/wiring etc, which is also why the compressor is not running

Can we eliminate parts without spending money on a replacement when it doesn't need it? For example, the compressor. Can it be tested to see if a live feed is going to it? If not, it would eliminate that problem and be a wire. Either way, I think this is going to be a pain in my ass working it out.