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Discussion Starter #1
Hi

I have a 2006 L322 4.2 Supercharged that has been pretty much fault free for the last 3.5 years of ownership. It has done 63 000 miles.

About 2 weeks ago shortly after start up the dash display flashed up 'Transmission Fault' then something like 'limited gear selection' and 'Suspension Lowering', the warning dash light and traction control dash light then remained on. I switched the car off and re-started, after which the car was fine.

The next day the car flashed up 'HDC Fault' and the Suspension Lowering', again when turned off and back on the fault cleared.

Over the last 2 weeks the car has registered these same faults almost everytime its been driven (about 15 times), usually its just the HDC warning that flashed up but sometimes it flashes the Transmission warning and on occasions it has flashed up both warning one after the other.

I have taken it to a Land Rover specialist who ran a diagnostic check and could only get 'Module BUS' or similar, they said the ECU didn't seem to be talking to a module properly? They did a hard reset (what ever that means) but the faults persist.

I have replaced the battery yesterday (with a BOSCH 019 830Amp) but the car still flashed up HDC about 30 mins into my journey back from the garage.

There doesn't seem to be any pattern to the fault warnings - sometimes its within a minute of start up, other times its 40 mins into a journey cruising at 50MPH on the motorway (roadworks).

I have considered the following may be linked to the problem -

Car had an LPG conversion 2 days prior to these faults starting to occurr, this involved the battery being disconnected for 3 days and also the air compressor being moved from the spare wheel compartment, although not disconnected or anything and the faults don't seem to coincide with the air suspension being operated.

Car always sinks to its bump stops overnight, although it has done this for the last year or so (I intend to get this repaired in the near future)

Side bars were fitted day prior to the faults starting, although they simply bolted on and didn't involve anything being disconnected or anything

My thoughts/questions are -

Why did the diagnostic check simply show up 'Module BUS'

Is the LPG conversion likely to be the cause and if so in what way could an LPG conversion cause these faults

The old battery was the original one supplied with the car but when tested it came back 'Good Battery 87% charge' (I replaced it anyway just in case) - could it be something to do with the alternator, if so how would I check this?

What else could it be?

Is there anything I can do myself to try and diagnose the cause without sending it to the dealers who will no doubt want a few hundred quid to look at it!

Sorry for the long post but I wanted to put as much info in as poss.

Thanks in advance!
 

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Re: Help please! 2006 L322 HDC and Transmission warning / fault

to check the alternator use a voltmeter, measure the voltage of the battery, without engine running around 12 volt and when engine is running should be around 13.7 volt, if it stays at 12v then alternator is not giving power, hope that helps
 

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Discussion Starter #3
Re: Help please! 2006 L322 HDC and Transmission warning / fault

12.4 with engine off

14.6 with engine on

Forgot to mention the car has always (ever since I got it at 6 months old) made a squeeking/squeeling noise from the alternator area when started cold, bit like a slipping fan belt, it goes away after driving for a minute or so.
 

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Re: Help please! 2006 L322 HDC and Transmission warning / fault

alternators ok then, it sounds like whoever fitted the lpg system spliced into something they shouldnt have done as before the lpg fitment you had no problems, coincidence maybe ?? as for the suspension dropping to the bump stops, there is definately a leak in the system somewhere, if i were you i'd call the guys who fitted the lpg system and complain
 

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Discussion Starter #5
Re: Help please! 2006 L322 HDC and Transmission warning / fault

Thanks

I've already spoken to the LPG company and they have promised to pay for any repairs if it is the LPG system that has caused the fault but they are pretty confident it won't be anything to do with the system.

Is it unusual for the Testbook programme to fail to diagnose where a fault is originating from?
 

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Re: Help please! 2006 L322 HDC and Transmission warning / fault

it could of course be a loose connection somewhere, maybe the lpg company was working too close to a connector behind the dashboard and dislodged it, if the landrover guys couldnt find it straight away maybe you could try an independant automotive electrician, its hard to do a diy job, only thing you can do really if youre a bit handy is to check all the connections and earth straps thoroughly; and see if that helps, are you still getting all the faults or just one ?
 

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Discussion Starter #7
Re: Help please! 2006 L322 HDC and Transmission warning / fault

Seems totally random as to when the fault occurrs and about 40% of the time its the transmission, 40% its the HDC and 20% both at the same time. It always clears after turning off and back on and then doesn't usually come back on for the rest of the journey.

I'm going to have a good look round today and then get it back to the LPG place for them to check everything they have done before sending it to the main dealer if it still persists.

I thought putting it through the testbook computer would have revealed more than it has.

Thanks for the suggestions on this.
 

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2010-2012 Range Rover MkIII / L322
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Re: Help please! 2006 L322 HDC and Transmission warning / fault

Just in case the stealership didn't bother to do the hard reset pull the HDC ECU fuse wait a couple of minutes and put it back in again. It is amazing how many RR 'faults' dissapear when this is done.

Failing that pull the connector off the ECU apply contact cleaner and reinsert. This also cures a large percentage of the more real faults.

It is easy to forget the with LR/RR we are generally talking 5yrs+ on this forum and at that kind of age contact corrosion starts to become a bit inevitable.

Good luck!
 

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Discussion Starter #9
Re: Help please! 2006 L322 HDC and Transmission warning / fault

Thanks L322, I'll certainly try those.

Maybe a daft question but where do I find the ECU?
 

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Re: Help please! 2006 L322 HDC and Transmission warning / fault

Quick update -

LPG guys have done thorough check and found nothing. They also tried to read any fault codes but their code reader said there were no faults stored. They wondered whether putting the LPG ECU next to the engine ECU could have caused the faults through interference between the two but they placed insulation between the two ECUs and this hasn't solved the problem.

I have replaced the battery, removed and cleaned the ECU connectors (located in the black plastic box in the front RH of the engine bay) and disconnected the battery completely for 30 mins.

I'm wondering if the faults are connected to the EAS compressor as this was moved slightly during the LPG install, is this possible/what could I look for?

Any suggestions as to where I should buy a code reader from as it looks like I could do with one.

I'm also going to try and test the alternator itself but I'm not looking forward to sticking my arm down there!

I'm going to book it in at the main dealers if I can't get to the bottom of this soon!!
 

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Re: Help please! 2006 L322 HDC and Transmission warning / fault

ngb13 said:
Quick update -

LPG guys have done thorough check and found nothing. They also tried to read any fault codes but their code reader said there were no faults stored. They wondered whether putting the LPG ECU next to the engine ECU could have caused the faults through interference between the two but they placed insulation between the two ECUs and this hasn't solved the problem.

I have replaced the battery, removed and cleaned the ECU connectors (located in the black plastic box in the front RH of the engine bay) and disconnected the battery completely for 30 mins.

I'm wondering if the faults are connected to the EAS compressor as this was moved slightly during the LPG install, is this possible/what could I look for?

Any suggestions as to where I should buy a code reader from as it looks like I could do with one.

I'm also going to try and test the alternator itself but I'm not looking forward to sticking my arm down there!

I'm going to book it in at the main dealers if I can't get to the bottom of this soon!!
Wht Mai Dealer (Stealer) why not a try an Independent Specialist at average 50% charges :idea:
 

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Discussion Starter #12
Re: Help please! 2006 L322 HDC and Transmission warning / fault

I tried my local specialist first (see first post) and they didn't get anywhere. I'm all for specialists but on this occasion I've lost patience and I'm hoping a main dealer will get this sorted, if it something major then I'll prob take it to a specialist for the repairs.
 

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2006-2009 Range Rover MkIII / L322
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hey did you ever end up fixing this issue. im having the same issue with mine, it would randomly pop up those messages once in a blue moon but a restart would make them go away. but yesterday they came on while i was trying to reset the oil change interval and wouldnt turn off. put a brand new battery today and still a no go. i took it to an indy shop and his scanner couldnt bring up any codes, he RESET THE capacitive discharge and it then let his scanner bring up 13 faults. still have the lights on.
 
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