Thread: Dash freak out electrical

I'd be checking all the earths and power supply, particularly affecting the various computers.

Change out your Brake Pedal Switch, I had all sorts of crazies when I mucked around with this cicuitry attempting to install relays.

Originally Posted by Kriley

Hello, I have a 2007 Discovery 3 V6 Diesel, I have a problem out of the Blue this car will freak out and lots of stuff comes on the dash screen it say's "F Gearbox fail limited gears available" also lights up the DSC and the Suspension system indicator along with the Park Brake Fault and I have zero acceleration car just slows down to a stop engine still running but zero acceleration, I pullover switch off engine pull key out wait until dash screen clears and return the key into ignition and wait for system check then start car and drive off it might happen again in 1 mile or 10 sometime not for a month or 4 months last year can anyone please help as there isn't always somewhere safe to pullover when this happens and is very dangerous as I live 2 hours out of town....HELP PLEASE20201127_085924.jpg20201127_085920.jpg20201127_085911.jpg20201127_085924.jpg20201127_085920.jpg20201127_085911.jpg

Do a quick test, start the car and once it's running touch the brake pedal. If it lights up right away it's the brake switch.
If possible try and drive it without using the brakes and once moving try it.

Basically all the systems you've indicated sit on the high speed CAN bus and chat frequently. If one of them stops doing that due to a fault, all will **** the bed.

Could be anything from a blown tail light bulb through to the high pressure fuel pump (in order of cost).

Each of these ECUs has a comprehensive diagnostic and will record the fault codes. Most of them will say "communication fault" and one of them will have one or more credible faults. Unfortunately without a code reader you're destined to stumble around in the dark throwing expensive parts at the vehicle and getting increasingly frustrated.

Unless you live miles from anywhere, chances are someone "relatively" close to you has a device that will read codes.

We had this problem last year, still resolving issues.
Have changed
EGR (Both)
Turbo hoses
Standard service items like coolant, oil filter, oil etc
Fuel Filter
HPFP
LPFP
Integrated Transfer Case then reflashed
Fuel Injectors
MAF
MAP
Fuel Rail Sensor
Brake Light Switch
Battery
It has been a bit of a journey, all started with the car when accelerating uphill dropping power. Started changing the easy stuff. Then had the full set of christmas tree lights and limp mode coming back through the Adelaide Hills. Managed to find enough flat roads to get home at 80kmh or less.
I suspect changing the battery helped a lot.
On the weekend driving back from down south the E
SF and low power again. Pulled over cycled everything through and it cleared enough to drive home.
I now treat everything we fix as one step closer.

Anyone have any suggestions on codes P023D P132B P0331 U0401 This is the most recent set.

Good luck!

Originally Posted by igfbss

We had this problem last year, still resolving issues.
Have changed
EGR (Both)
Turbo hoses
Standard service items like coolant, oil filter, oil etc
Fuel Filter
HPFP
LPFP
Integrated Transfer Case then reflashed
Fuel Injectors
MAF
MAP
Fuel Rail Sensor
Brake Light Switch
Battery
It has been a bit of a journey, all started with the car when accelerating uphill dropping power. Started changing the easy stuff. Then had the full set of christmas tree lights and limp mode coming back through the Adelaide Hills. Managed to find enough flat roads to get home at 80kmh or less.
I suspect changing the battery helped a lot.
On the weekend driving back from down south the E
SF and low power again. Pulled over cycled everything through and it cleared enough to drive home.
I now treat everything we fix as one step closer.

Sounds like you've changed everything except the headrests.

Originally Posted by igfbss

Anyone have any suggestions on codes P023D P132B P0331 U0401 This is the most recent set.

P023D - MAP / Boost correlation. It's not seeing the Boost pressure it's expecting for the conditions.
P132B - Turbo vane actuator issue. Would explain ^^^
P0331 - Knock sensor

I see you haven't changed the turbo yet. Maybe jump on the Disco3UK site and read some of the posts on wiggling the turbo actuator to see if it's stuck. Keyhole surgery through the passenger side wheel well.

Check the plug on the left hand bank knock sensor.

I have just been through the same issue. O2 sensor was the first code to come up, then after a while the rest beep and lose the plot. O2 on Bank 2 sensor 1 was my codes. I finally received my scan tool today and cleared the codes, knowing that the O2 sensors will need to be replaced soon, yet to take it out and see what becomes. Mine is 4.0 Petrol Auto Disco 3.

Originally Posted by BradC

Sounds like you've changed everything except the headrests.



P023D - MAP / Boost correlation. It's not seeing the Boost pressure it's expecting for the conditions.
P132B - Turbo vane actuator issue. Would explain ^^^
P0331 - Knock sensor

I see you haven't changed the turbo yet. Maybe jump on the Disco3UK site and read some of the posts on wiggling the turbo actuator to see if it's stuck. Keyhole surgery through the passenger side wheel well.

Check the plug on the left hand bank knock sensor.

Thanks Brad
We have played with the actuator.
LR Dealer tells me we don't have a knock sensor bases on the VIN so this one has us a bit puzzled. Might have to pull some bits off this weekend and look!
It is going in for a turbo check next week. Vehicle has done 180,000km (mostly on road) really hoping we don't need to do the turbo at this point. Although we will start a plan.
I have looked on the Disco3UK site & the South African forum as well. That is useful because we co not have some of the issues that come from salting roads in the UK

2007 Disco 3 2.7TDV6
Assorted other cars over lots of years.