Discovery 4 electrics turn off while driving

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2nd January 2022, 12:23 AM
ScottA

09 D3 same problem

Quote:

Originally Posted by Steve86

Hi All,

So we managed to get a month into disco ownership before an issue came up.

While driving we have a number of items intermittantly turning off & on including temp gauge, air con, central display unit, parking sensors, indicator display. Fortunately there's no mechanical shut-offs & speedo, lights, indicators (external) etc continue to operate. No warning messages until the car is switched off & a whole bunch flash up. It clears when the car starts up again.

Very similar issue reporting in this thread:
2012 LR4, electrical issue. Dash go blank while driving. - Land Rover Forums - Land Rover Enthusiast Forum

Quote from thread:

So take your pick on what fixed mine:
1. New alternator, which was badly needed anyway
2. New BMS, which was also reset a few times
3. Refurbished instruments, but they had other issues anyway
4. New battery, the new battery I previously fitted was not holding charge properly, but that could have been caused by the electrical issues as I was getting some strange charging behaviour
The problems still persisted and became more frequent until:
5. I played with the wiring in the centre console ( lots of large connectors carrying the HS and MS can bus there and most of my faults related to the MS canbus)
One more instance of the faults, then nothing since.

Personally I suspect a dirty connector. It would work intermittently when there was enough charge to jump the connection, but would fail when the charge dropped ( which the BMS dictates when the battery is fully charged, or under acceleration) ?

I'm assuming the same issue as suspected in their thread - loose connection. Has anyone else had this issue?

Cheers,
Steve

Hi Steve,

MY D3 has just started showing the same issue (Christmas Day as well). Had it serviced 22/12... I originally thought it was the heat, but reading around the issue, my symptoms are the same as everyone else's.

My mechanic is excellent, although I'm not sure about how his team is for technical electrical stuff, so I'm not sure if I will take this problem to him.

Which auto electrician do you use?

Regards,

Scott A.
3rd January 2022, 06:37 PM
Steve86

Quote:

Originally Posted by ScottA

Hi Steve,

MY D3 has just started showing the same issue (Christmas Day as well). Had it serviced 22/12... I originally thought it was the heat, but reading around the issue, my symptoms are the same as everyone else's.

My mechanic is excellent, although I'm not sure about how his team is for technical electrical stuff, so I'm not sure if I will take this problem to him.

Which auto electrician do you use?

Regards,

Scott A.

Hi Scott,

The points in my original post were quoted from another forum (and user) - I've only had my D4 for a few weeks so hasn't yet seen a mechanic or autosparkie while I've had it.

I also thought might be heat related but the issues have continued this week in the cooler weather. Temp gauge always drops out, then air-con/temp controls & sometimes the head unit turns off. I get a whole bunch of error messages if I turn off the car while the issue is occuring but it starts up fine with no errors displayed.

Looking through the reciepts from the previous owner there's no record of the alternator or battery being replaced. I'm thinking it may be a loose connection or charge issue. Car is booked for a service on the 13th so that will be the 1st time I'll have someone looking at it. Will post updates on how it goes.
6th January 2022, 11:11 AM
ScottA
Hi Steve,

My bad, I confused your post. It was Dazza who mentioned the sparky....

+++++++

Hi All,

My issue also seems to be worse after the vehicle has been off for a while. My symptoms are eerily similar to others documented previously, but for completeness:
- door locks cycle twice about 3-4 secs apart,
- dash info panel loses data (except for avg fuel consumption),
- hazard lights operate but don't show on the dash,
- air cond fan goes off,
- 10-20 secs later the error message "vehicle fault, system shutting down" appears on the radio/CD info panel,
- Time disappears from the radio/CD info panel.
- Some time later everything starts up again.
If this happens on first turn of the key, the vehicle will not start. If it is already running, it will remain running.

I will check the connections into the rear of the head unit per suggestions on the other thread quoted by Steve, but any other suggestions welcome.

Many thanks,

ScottA
28th January 2022, 11:55 PM
Steve86
Quote:
Originally Posted by ScottA

Hi All,

My issue also seems to be worse after the vehicle has been off for a while. My symptoms are eerily similar to others documented previously, but for completeness:

door locks cycle twice about 3-4 secs apart,
dash info panel loses data (except for avg fuel consumption),
hazard lights operate but don't show on the dash,
air cond fan goes off,
10-20 secs later the error message "vehicle fault, system shutting down" appears on the radio/CD info panel,
Time disappears from the radio/CD info panel.
Some time later everything starts up again.

If this happens on first turn of the key, the vehicle will not start. If it is already running, it will remain running.
So have an update after finally getting the car back from service. Mechanic had checked fault codes & there were many, so reset them & told me to come back if the issue happended again so we could confirm which one(s) are relevant.

I managed to get about 500m down the road from the garage before the issue showed up. Immediately turned round & got my mechanic to run diagnostics.

Fault code is for a loss of communication with the body control module - U0140 (loss of voltage).

Next step will be to check the BCU & clean connectors (2 hr job).
3rd February 2022, 11:05 AM
ScottA

Hellectrics

Quote:

Originally Posted by Steve86

So have an update after finally getting the car back from service. Mechanic had checked fault codes & there were many, so reset them & told me to come back if the issue happended again so we could confirm which one(s) are relevant.

I managed to get about 500m down the road from the garage before the issue showed up. Immediately turned round & got my mechanic to run diagnostics.

Fault code is for a loss of communication with the body control module - U0140 (loss of voltage).

Next step will be to check the BCU & clean connectors (2 hr job).

Well, an update from me too. The D3 has been in the workshop for over 2 weeks (Indy). They have recognised the loss of comms with the BCM as a cluster issue (as have a number of UK posts I have read) so we’re waiting for the cluster to be reconditioned (about $800 + labour + ouch).

Will update further when I have more info.
3rd February 2022, 12:51 PM
HarryO

Had a very similar thing on my old D3 - refer
D3 Intermittent Fault
12th February 2022, 11:14 PM
Steve86

Quote:

Originally Posted by HarryO

Had a very similar thing on my old D3 - refer
D3 Intermittent Fault

Thanks Harry,
Mine went through a check & clean of BCM connections but still has the original issues. Fault codes still direct to a BCM issue, was yours showing any other codes to indicate an issue with the Instrument Pack?

Also, was the BCM changeover straightforward - my understanding was that they're synced to each vehicle & reprogramming can only be done by LR.

My mechanic has reached the limit on what he's able to do, we are now looking for someone specialising in LR electrionics to assist. If anyone can recommend someone in Perth that would be really appreciated!
13th February 2022, 01:04 AM
Ferret

Quote:

Originally Posted by Steve86

...My mechanic has reached the limit on what he's able to do, we are now looking for someone specialising in LR electrionics to assist. If anyone can recommend someone in Perth that would be really appreciated!

For Landrover specific electrical specialists in Perth - Autocode without doubt
13th February 2022, 08:51 AM
shanegtr

Quote:

Originally Posted by ScottA

Well, an update from me too. The D3 has been in the workshop for over 2 weeks (Indy). They have recognised the loss of comms with the BCM as a cluster issue (as have a number of UK posts I have read) so we’re waiting for the cluster to be reconditioned (about $800 + labour + ouch).

Will update further when I have more info.

I've had canbus cluster issues twice with my D3. First time I had the cluster repaired:
No start issues
Second time a couple of years ago now, had very similar issues with the repaired cluster. I ended up just getting a cluster from the wreckers and its been fine since
15th April 2022, 04:31 PM
Steve86

Quote:

Originally Posted by Ferret

For Landrover specific electrical specialists in Perth - Autocode without doubt

Finally got around to providing an update:

So I booked in with Mark at Autocode to take a look at the disco last month, good bloke to deal with - very knowledgeable.

Issue is with the medium speed canbus, however they couldn't get the fault to occur while plugged in to diagnostics to pin it down to a specific cause (cluster, BCM, harness wiring). That was a couple of weeks ago, since then has not faulted despite trying our best to do so. Until it starts playing up again (hopefully never) we've hit a dead end. I do wonder if it could be hot weather related...

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