Land Rover Discovery Sport L550 Start/Stop Not Working - Fixed (Battery BCM LR038721) BMS

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In this video we investigate why the STOP START is not working on Kate's Land Rover Discovery Sport. With no fault codes or error messages and a good battery we decide to change the BMC. You can change the BCM without any coding and this fixed our problem ! The PN for this module ( latest version ) is LR038721. We do stock these on our website also :-
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20 окт 2023

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Комментарии : 79

@ianbeale2527 9 месяцев назад

Top tip. Keep the plastic battery terminal covers when you get a new battery instead of binning them and you can put them on the terminal if you need to take the leads off. Safer than a rag that may fall off.

@simonjefferson 9 месяцев назад

Sounds a good idea...

@nicknicolaou8512 9 месяцев назад

Mine never worked from new, but I never wanted it to work anyway .Replaced the battery after 8 years and reset the BMS. Now it does work I wish I could switch it off permanently again 😞

@guvnorrbm 29 дней назад

Followed this video, and fixed my Start / Stop issues instantly- Thanks!

@neilseymour2873 9 месяцев назад

Brilliant, had the same issue on mine. Bought and fitted this and now stop start working perfectly. Thanks Simon, more videos on Discovery Sport please👍

@L663 9 месяцев назад

Let me know if its still working after a few weeks. We have the Discovery Sport and we will get it out and fix / modify it !

@jeffjames27 4 месяца назад

Excellent, my start/stop actually works now. I bought this off your site, it will pay for itself in a couple of months with the fuel I'll save. Thanks.

@L663 4 месяца назад

Interesting to see how many people find this to be a fix... Kate's car is still doing well.

@andrewjones8397 8 месяцев назад

Changed mine yesterday, Done the trick. Cheers Mate

@L663 8 месяцев назад

Be sure to let me know if it fixes it for more than a week.... Kats's is all good still and that was a couple of months ago !

@andrewjones8397 8 месяцев назад

@@L663 will do, I’ve only had the car a month, but it’s never worked for me but the garage did change the battery prior to my purchase, so I assume it was battery was dead and they jumped it incorrectly so fried the module.

@marklivsey1661 8 месяцев назад

Thank you so much for your video it's very, clear and easy to follow I changed the BCM and my auto stop/start is working I was about to spend £200 on a new battery.

@L663 8 месяцев назад

Let us know how you get on - one guy on here is saying it wont fix the problem - just help for a short time. Kate's car is still working perfectly... so i am thinking these modules do fail.

@marklivsey1661 8 месяцев назад

All I can say is it wasn't working and hadn't done for 3yrs plus now it does, I will keep you posted thanks again for your help 👍

@marklivsey1661 6 месяцев назад

Hi Simon Just a quick update on the BCM, as the other guy has said it stopped working after a few days, I fully charged the battery but it hasn't made any difference any ideas ? Cheers Mark

@Will-ge5mq 9 месяцев назад

I had both ek151 small and main battery replaced last week for my 2015 2.2 evoque . Reset the BMS using icarsoft 2.0 when the coolant temperature rise to the normal range the start stop works 😊

@petermorris3665 9 месяцев назад

I'm glad you mentioned the potential, on some vehicles, for a separate stop / start battery. I'm pretty sure my misses' 2015 MY Evoque has the separate stop / start battery.

@handycrowd 9 месяцев назад

Yeah, it does, it's a bit weird really given how similar the Evoque and Discovery Sport are under the skin.

@Stubear22374 9 месяцев назад

My Skoda has a second HV battery for s/s I thought it’s universal for all s/s very odd

@TheWackyRacer 5 месяцев назад

A well known breakdown service popped my BMS when they jump started me and did so from both battery terminals. It cost them not me 👍

@HQBProductions 9 месяцев назад

Simon…my Stop Start has rarely ever worked on mine since new and I am pleased for it to stay like that…I hate the stress of one second cycles and understand it puts a load on the timing chain to shorten its life. I have noticed that it will work in random spurts every so often but was told that failing to work is usually a sign of the battery getting old and tired. Certainly a new battery brings it too life but on my car, not for long. As I type, my friend has this fault on his Discovery but the battery is certainly three years and 60,000+ miles old. Maybe his BMS is dying because his has become very random….for me though…not working is perfect! 😃😃😃Richard.

@cjwaywell 6 месяцев назад

Turn your aircon off and it will always work

@ALKUKES 17 дней назад

can the bms cause the car not to start all the lights everything works but it will not crank

@user-yb6cz4ky2e 8 месяцев назад

Hello, your videos are great thank you. Would you have any info with respect to backup camera replacement and reconfiguration of back up boarders for a 2016 Discovery Sport, regards.

@kear3922 9 месяцев назад

Will it be fine to just remove/leave off? First thing I do when I start my car is switch it off, I would leave it broken, save the wear and tear on the starter motor & battery.

@L663 9 месяцев назад

Maybe i should sell the broken BMS on ebay ?

@directorski 6 месяцев назад

Thanks for the video. If connecting a solar panel for battery maintenance, would it be advisable to connect directly to the main battery terminals?

@L663 6 месяцев назад

Interesting - i guess it should go onto the BCM terminal not the battery terminal so the BCM can see the charge - but this is a guess !

@tpaulmorris 6 месяцев назад

Great video…. Keen to know, is it still working?

@majorsidhu8995 7 месяцев назад

Hi great content and advice this part only come from LR direct or can I get from Euro CP? Also what is the details of the software you use to connect to the car please

@L663 7 месяцев назад

I think this part is best from Land Rover dealer. If you buy a new one you do not really need the software as it will have to relearn itself. The software we are using is the GAP IID tool from GAP Diagnostics.

@FriedrichKeller 7 месяцев назад

Hi SImon, If the BMS and negative pole are disconnected, is it a good idea to connect a backup charger to the points in the motor compartment so that the various electronic units continue to receive power?

@L663 7 месяцев назад

I don’t think so as you probably want the system to do a reboot when reconnected

@cosminbidireanu9450 2 месяца назад

hey greetings from Romania, what scanner do you use for land rover diagnostics? a link where I could order...thanks

@mda5003 9 месяцев назад

I've got start/stop on my VW and I switch it off every time. I cannot see how it can possibly save fuel and even if it does I'm sure the additional cost of a replacement start/stop battery (it's a lot more expensive) would negate any saving in fuel.

@umac01 4 месяца назад

Yes, same with Audi, I hit the off button on the stop start as soon as I pull off the drive. I replaced the battery after 4 years and only 20,000 miles use. I blamed the Stop Start system for the short life of the battery.

@davidthomas9267 9 месяцев назад

start-stop is a very bad idea. Wife's 2021 House Honda Pilot start/stop system recalled- first try was a system reboot and that failed- so Honda used $1,400 worth of parts to fix it. If I have to drive it I always push the botton to over ride the system.

@alchristie5112 9 месяцев назад

I have a 2016 Disco 4 which has the ECO warming light on all the time. It have a stop / start battery and my understanding is that it’s only used to support the systems while the main one does the actual startup. I have generic error code P0615 which is defined as “Starter motor relay -circuit malfunction”. Both batteries have sufficient voltage 12.3-12.6. While I’m happy that stop/start doesn’t work, the amber light really pokes in the eye. Any way of checking if the BMS is the issue ? Thanks

@L663 9 месяцев назад

I am not really an expert on these things - it makes sense that the small battery is to support the other systems. It does not sound like a BMS issue - seems more like the relay circuit but as the starter motor works this is a little odd !

@ianjsallen100 5 месяцев назад

Brilliant RU-vid thanks, is this the same,and applies to a jaguar xe r-sport ? . Thanks

@L663 5 месяцев назад

I would think so !

@matthewhaddon599 9 месяцев назад

Been there done that. The best way to check the operation is to go into live data when the car is warm, in either BCM or PCM and check for Stop/Start inhibit data...this will tell you the reason that the stop/start is not working. You will probably find that it comes up with battery performance or similar..it won't be the BMS module that you changed. The reason it works now is because you reset the battery. As the system takes time to relearn the battery level you will find that it will stop working again after a couple of weeks. Basically it needs a new battery...the battery should be tested off the vehicle as well...charge to full capacity, leave overnight and it should be 12.7v or better. The older dual battery system which I have on my Jag seems much more reliable.

@simonjefferson 9 месяцев назад

You may of course be correct - but i will share data that i find - the only thing that makes me think we will be OK is that Land Rover make a point that you can damage the BCM with charging leads etc... so maybe it is damaged. Also crazy it does not store an error code for "stop start not working due to low battery" or similar. Its madness to have a system that is not working and there is no data / warning / error message.... the car is loving life but its not working correctly !

@matthewhaddon599 9 месяцев назад

@@simonjeffersonYou should get a fault code if the BMS is faulty in theory. For some reason you don't get a fault code for low battery performance. It will however show this in live data. I did have a Discovery Sport with this issue and I did a lot of investigating the problem. You won't damage the BMS by charging the battery direct to the terminals as long as you use a decent charger, but it is best to use a different earth point to prevent spikes on the system. I tried changing the BMS as you have done, but I bought a good secondhand one to save some money. It worked for bit as I already mentioned due to resetting the battery. It takes a few days for the system to relearn the battery level, but once it realises that the battery is still low on capacity it will prevent the Stop/start working again.

@simonjefferson 7 месяцев назад

It is still working perfectly 4 weeks later...@@matthewhaddon599

@davidereira5382 8 месяцев назад

Will this work for persistent low battery warning, when it’s new battery and alternator confirmed as charging? Losing my mind with this low bat warning light 😢

@terryhastings1695 4 месяца назад

Did you fix this. I just got new battery

@kevinbrown6493 16 дней назад

Hi will this work for my 2013 range rover evoque as start stop does not work at minute

@ianlatto975 9 месяцев назад

Is this the same set up as 2016 HSE Evoque?

@fredbettesworth5397 9 месяцев назад

Brilliant, as mine doesn't stop start

@stephenmaneleys6983 9 месяцев назад

Excellent video. Would this be the same for the Range Rover Evoque?

@L663 9 месяцев назад

Not exactly the same - i think the Evoque has a 2nd battery !

@stephenmaneleys6983 9 месяцев назад

Ah. Ok. Do you know where that second battery is. As I've checked. And? Maybe another video?

@mvirdi2333 9 месяцев назад

👍👍👋👋🙏🙏

@johnbevan2079 9 месяцев назад

My start stop stoped working after 3 years the dealer changed the voltage control module under warranty and charged my battery worked for a couple of weeks I left my car at Southampton for 12 day drove home and the stop start did not work Went to the dealer and they fitted a new battery all now well after two weeks. Seems if battery is a bit weak it will not charge up to is fullest

@biz4twobiz463 2 месяца назад

Nice video. My only recommendation would have been to charge your battery while you were at it. Something like a CTEK MUS-4-3-charger or similar to your area works great!! Merci

@Stubear22374 9 месяцев назад

Will Land Rover ever sort its battery issues, every landie I’ve ever owned has had a plethora of issues, seems the new ones are no different

@grahameroberts8109 9 месяцев назад

You say ‘Body Management System’ for BMS? 🙈🙏👍🏻

@stevenmoran4060 9 месяцев назад

Stop start generally won’t work if the car is running air con or the outside temperature is low. It is designed to protect the cars battery. Plus, slightly moving the steering wheel when stopped will also restart the engine or pulling a large load on the battery with heated screens both on for example can prevent stop start working to protect the battery. Another point is, with the light on the switch illuminated are you sure that means on or off? For example, my lane assist switch illuminates when I have lane assist turned off and not as you would think turned on. Yo me stop start is a total pain in a manual cr but fabulous in an automatic.

@L663 9 месяцев назад

At the end of the video the light is on and stop start was working then so LIGHT on = START STOP operational. Valid points about the electrical load - although the start stop has never worked since Kate has had the car - now it works most of the time so i am pretty sure we have fixed it.

@freelander_adventures 9 месяцев назад

I notice there was a HVAC fault code stored. It would have been interesting to know what that was and if clearing it let the Start/Stop work again. So many parameters need to be met before it works too which owners often overlook too.

@markwall6651 9 месяцев назад

When charging the battery on most JLR (where the battery is in the boot/luggage area) the charge terminals are in the engine bay. So, in the Evique and DS this isn’t the case, so where do you put the charger connected to not damage the BMS?

@freelander_adventures 9 месяцев назад

@@markwall6651Positive to the positive terminal on the battery and then the negative to any good ground

@markwall6651 9 месяцев назад

Many thanks

@monkey281059 9 месяцев назад

My evoque stop and start does not work either wouldit be the same part I need Thanks

@L663 9 месяцев назад

I think the Evoque is different a little - there is a 2nd battery i think

@cjwaywell 6 месяцев назад

I just reset my battery management system with my scanner without the need to replace the battery management system

@mohammedambusaidi1188 9 месяцев назад

Dear, 😢I have a problem with my Discovery 4, can I contact you?

@L663 9 месяцев назад

Ask me here is fine ! others may be able to help you too !

@mohammedambusaidi1188 9 месяцев назад

Sometimes I encounter the doors not working properly when entering and exiting and the smart key does not close the doors and does not open the doors, the engine turns off and all the messages in the dash work

@peterhickman9967 9 месяцев назад

Sometimes mine works and sometimes it doesn’t but when I was in France the other month it worked all the time but in the uk it doesn’t 😂😂

@L663 9 месяцев назад

Tres bonne !

@Valisk 9 месяцев назад

Mine stopped working. Which is great, it means I don't have to switch it off every time I get in the car.

@L663 8 месяцев назад

Many will share your view !

@zaffiqbal9740 9 месяцев назад

Mine is a bit random… batter one year old….90% health checked…

@notrut 9 месяцев назад

12.37 Volt is poor ... for a vehicle absolutely stuffed with stuff to go wrong. It should be charging 13.8 to 14.2 so what's the Alternator doing? If it's a 5 year+ car I would be changing the Battery ... as WINTER approaches.

@L663 9 месяцев назад

the car did not have the engine running.... you are not going to get 14v with the engine off !