Discovery 3 HDC,Transmission Fault, Handbrake fault with *FIX*

Car had intermittent fault as seen in the video where it would drop the suspension and be stuck in 3rd gear showing 'F' fault on dashboard. I first thought it was connected to my Sunroof drain being blocked and split which can be seen in another Video and the passenger side wiring channel being full of water but it was the TCM Module behind the battery.. Hope you find this Video helpful in fixing your Discovery 3.

[@JonathanTruss]

Very useful thanks would never have known how to fix all those fault codes coming up or the confidence to take that box out and apart. Had the exact same problem but changed brake light switch first in case but didn’t help. Cleaned up contacts with contact spray on that transfer case control unit and one of the spades had corroded so badly it had broken off. Opened up box easy enough. Had to solder a wire to that contact and get creative but fixed it. Terrible place to put that module, condensation alone will knacker those contacts over 14 years! I see they moved it on the D4! Anyway all good..All lights off and suspension back to normal height, gearing correct etc. Had a D3 for 9 years & still love it. Thanks again for your video, I think you saved me a small fortune and a ton of hassle. In appreciation.. JT

[@lazylen7199]

Thanks for your comment, really glad people are finding it useful. It is in a silly place but at least they moved it with the Updated D4 as you said

[@garrykennedy5484]

That's one hell of a battery drain! That corrosion build up must act like a semiconductor bridging the two pins. Tremendous find man. Truly amazing work. Very impressive. Thanks for the video. I don't have this problem, but I watch these videos in case I do.

[@aidandorr2131]

Yup same issue this video has saved me a massive headache and thankfully caught it early so I didn't have to replace the board

[@sergeant9803]

after doing all the pissing around personally..i think if i saw my Rover lights all off like in this video, and not always fearing for the next shut down and no start... i would cry so many tears of joy...and my tears would leak in somewhere and destroy my electrical again

[@jamesneesam7001]

Big thanks for this had intermittent fault whenever I turned left, battery wasn't fastened down and the earth cable was pulling on the loom for this and pulled the connector loose Top bomber Thanks 👍

[@francescomaggio3184]

GRAZIE MI SEI STATO VERAMENTE UTILE ! GRAZIE AL TUO VIDEO HO RISOLTO UN GRAN BEL PROBLEMA 💪🏽🙏

[@juniousbartlett4113]

What app did you use on your phone or tablet?

[@jacksrcat]

How do you reset the steering angle sensors ?

[@NathanNostaw]

Thanks for sharing. Ours has started doing the same faults. I’ll have a look in the same spots. Cheers.

[@IBODEGAI]

What was the result?

[@NathanNostaw]

@@IBODEGAI had the rear brakes serviced and new drum shoes. No issue since.

[@danmurphy6541]

Nice vid man, good fix

[@markhugall8365]

Thanks for this as my discovery is doing the same a few times a week. Is there a walk through on how to access the box and take it out and clean it?

[@cruisingarizona]

Thank you so much for making this video! Great job

[@lazylen7199]

No problem, I'm glad people are finding it helpful

[@zackdaniels6858]

THANKYOU SIR!

[@wisemannhlakaniphobhengu2285]

Good job well done

[@maskeenabbasi9319]

Very good

[@bernhardschweighofer143]

Great video thanks. My 08 Sport blesses me with the HDC fault. Between 2 and 6 times a day with in a km from home. No bumps in the road or heavy braking but always steady speed and straight line. I replaced the battery, reset steering angle, cleaned every earth I could and removed the ecu behind the battery as was shocked to see flimsy rubber boot seal. Like u I couldn’t see any corrosion on the plug so popped the alloy cover off but never saw and on the board. Now I didn’t look at the base of the big conductors so did you just spray contact cleaner in there or also use say a brush to clean it. I might pull it all out again and go over it once more to try fix mine. It’s been doing this for months now…………limp mode, 3 amber lights and fault codes as long as my arm not communicating with any thing and every thing……

[@lazylen7199]

Hi Berhard, thanks for your nice comment. I cleaned the terminals using a toothbrush. The corrosion was really only very little at the base of the pins where they connect to the board, green tint on the pins. There are many things that can cause virtually the same symptoms for example the steering angle sensor on the steering column can be turning cause the sensor to keep throwing a fault. May be worth checking out www.disco3.co.uk if you haven't already that is. Good luck. Len

[@bernhardschweighofer143]

@@lazylen7199 Yer all good, I may just just revisit that and brush it as well. I epoxied the steering sensor as it wasn’t spinning but felt a little loose . Cheers again.

[@kemalkale9278]

I had the same problem. Hdc + transmission fault + engine system fault on the screen. During investigation diagnose showed many fault codes including turbo, high pressure fuel pump, egr valves etc.. but later we found the main problem causing these fault codes. It was one of the injectors. There was a fuel leak from that injector. We changed the o-ring and never had any fault message since then.

[@garrykennedy5484]

Hey! You posted the exact same comment on another video I just watched. LOL I don't have these fault codes, but I'm trying to stay ahead of the game if you know what I mean. So when I DO run across it, I already have an idea. This bloke did some serious digging to find this one. I imagine finding yours was no cake walk either. (I'll have to google where the term CAKE WALK came from now also. haha)

[@bigbootedskin]

had HDC fault system not available ... no fault codes tho. so took battery out ,removed plastic cover to expose the tcm ,removed tcm and sprayed the plugs with contact cleaner, opened the tcm to look for corrosion on the pins and nothing so gave everything a good spray with contact cleaner and reassembled it , pluged it back into the car replaced battery ,1st start got the same mesg so left it running for 5 mins switched off and switched back on again and not had the mesg since .. no corrosion but may be there was some dust but it seems to have done the trick. thanks lazylen for the info on your video

[@lazylen7199]

Its so nice to know this video is helping so many people. I wish I'd have filmed it in a better way, didn't realise at the time that it was going to actually work. Thank you for your comments

[@bigbootedskin]

@@lazylen7199 unfortunately the HDC fault system not available came on again this morning so i dont know what is causing it

[@lazylen7199]

@@bigbootedskin There are many causes. Could be low battery voltage, could be Brake pedal switch, could be steering angle sensor, could be even as simple as a under inflated tyre, especially if it happens when moving. You may have already checked all of those but worth a look if not. If your brake lights still work it doesn't necessarily mean the switch is good. Good luck

[@bigbootedskin]

@@lazylen7199 ive just orderd break light switch as they are cheap enough to change just incase ,had new battery,new alternator and starter motor recently, i dont think there is anything wrong with steering angle sensor as im not getting any codes when its pluged in

[@bigbootedskin]

@@lazylen7199 changed Brake pedal switch, and put battery on the conditioner over night just to make sure battery was fully charged ,used the car twice now and no hdc fault ...

[@shanebuddington4718]

mine does this after a car wash or using the windscreen wipers, how did you seal up the box?

[@lazylen7199]

After spraying the board with duck oil I layered vasoline around the edge of the board and applied between the casing joints and secured with 2 small cable ties. Make sure that your battery box cover is on properly with the piece of seal along the back edge of it. Also make sure the rubber bonnet seal that goes around the inner wings and across the bottom of the scuttle panel is on properly otherwise water can get in and run down the back of the battery.

[@EverydayWorkshop]

Great fix Len, you did well finding this fault. Is it still holding up. Possible the corrosion was not from a leak, maybe just condensation. Very good and helpful find.

[@lazylen7199]

Thanks. Yes, still all good. Could just be condensation but I also found the Bonnet seal rubber was not seated properly over that area

[@kamrankp85]

So im out on vacation with my family and got this same issue. Car just died an limited gear and f and parkbrake etc.wont start. Im reading out several fault and im kind of convinced its the same thing. Going to open the box and check. But i have one question...why the steering angel reset?

[@lazylen7199]

Just as a precaution as systems are connected

[@hugomarquez1173]

How u fix it i have same issue

[@joecamel2576]

I have a faulty TCM on my Velar 2019 D180… I am curios were is located… as I had a engine wash about 3 weeks before it went down… car is blocked in Parked…

[@pepitreu755]

Hola no es modul EU es tablero roto? ?

[@tonylester382]

Did the fault ever return? Am also getting the same lights on my dash as well.

[@lazylen7199]

No, it hasn't returned. It's was the smallest piece of corrosion on the inner pin, slight green tint to it

[@nirmalnedimaram7235]

Hi, when I try to do a scanning on my 2005 LR3 V8 4.4 only the ELM is connected the ECU is not getting connected, can you pls tell me the possible reason for this. All the dash lights are on and the Transmission is F.

[@lazylen7199]

Would not know what to suggest to be honest. Maybe try disconnecting the battery for 10mins then reconnect

[@jontilley9031]

I took the Transfer Case ECU control module off , no sign of any water ingress. Put the whole thing back together and still the three messages are still there.... Nightmare

[@jacksrcat]

And you just cleaned the contacts ?

[@diyfrenchiesfamily5227]

Hi , thanks for the video , i have the same problem, where is located the TCM i have a LR 2 2007 3.2 HSE I6 help ;)

[@lazylen7199]

On my Right Hand drive vehicle its located down the back of the battery which needs to be removed

[@nw8000]

Hey man, Whats that scan tool you got?

[@lazylen7199]

www.gap-diagnostic.com/products/iidtool/

[@andilegcuke8106]

Got the same problem m in Cape Town SA WHT can I do

[@donatopinto1351]

Hey bro ot was the module or the battery??? I have the same problem... same but same really same... I checked the module and clean but still the same problem...

[@lazylen7199]

With mine it was very slight corrosion inside the module on the pins I point at. I had changed the battery because the volts kept dropping below 12.3v but this was caused by corrosion in the module. As soon as I cleaned that the drain went away as did the faults.

[@donatopinto1351]

@@lazylen7199 bro and what's the good voltage in the battery???

[@lazylen7199]

You can see near the end of the video that my battery was sitting nicely at 12.7v while connected to the car.

[@SmokingHazard]

Bro same problem in my RRS 2006 some time no starts !!

[@hugomarquez1173]

Mine trows the manufacturer controll code and it shows up all the break lights on dash i do have a broken rear sensor can that be why all lights turn on dash

[@lazylen7199]

Anything broken with electrics/sensors on these cars is going to give you problems. You can show the same faults with different causes. Could be low voltage battery, or brake light switch or if you have a brake light bulb faulty can be a problem too.

[@nickforsyth2153]

What Bluetooth scan tool are you using? Thanks

[@lazylen7199]

It's the iid tool from Gap. You can buy direct from Gap or pick them up from the Disco3.co.uk site as they come up for sale. www.gap-diagnostic.com/products/iidtool/ Hope that helps

[@shanebuddington4718]

there is a temperature sensor behind the battery 2 wires needs to be plugged in

[@ryanendreszl6976]

Can you explain this ?

[@plambertwilu1464]

Bonjour et merci Monsieur,j'ai le même problème mais ,je suis coincé.

[@EmilienTroehler]

Bonsoir avais vous pu résoudre le problème ?

[@PeterOZ61]

Need to check mine as I get this from time to time but can go months with no issue then out of the blue it does it.

[@lazylen7199]

Have you noticed if it does it after it has rained or you have washed the car?

[@selebalotsiu7139]

I have same problem but on and off

[@brunotuiet359]

How do you make a diagnosis with your Samsung tablet ?

[@lazylen7199]

It's the iid Tool from Gap. They lock to the chassis number of the car. Buy direct from Gap or you can pick them up a bit cheaper sometimes from the disco3.co.uk site. www.gap-diagnostic.com/products/iidtool/ Hope that helps

[@pepitreu755]

La ecu no es??

[@jasonlo8780]

Whats that module called?

[@lazylen7199]

I believe it's the Transfer Case Control Module "TCCM"

[@Pointman92530]

@@lazylen7199 Where is it located on the car?

[@lazylen7199]

@@Pointman92530 It's located behind the battery

[@Comedyislandwilly]

Identical what just happened to mine

[@PeterOZ61]

dendrites!!

[@pepitreu755]

La ecu no es??