My disco4 everything is faulty when road is wet

alan1973 · Mar 7, 2020

hi
i am in highland for a holiday, but my disc4 ( dissel) was unable to start up the engine after had a heavy shower. finally I started the engine but the dash board was like a Xmas tree, everything gone wrong.
After 1hr, seems everything working. but after a 20 miles driving on a wet A82 road, the car started same problems again.
anybody have any idea? i will ask AA to tow me back if problem is serious.
thanks

DanClarke · Mar 7, 2020

Low battery volts sends everything haywire.
I bet you put yr headlights on in the rain?
New battery + a check of your Alternator.

freelance · Mar 7, 2020

Remember there are two batteries, smaller one for stop start, and if one is failing, it antagonises the other

alan1973 · Mar 8, 2020

DanClarke said:
Low battery volts sends everything haywire.
I bet you put yr headlights on in the rain?
New battery + a check of your Alternator.

battery checked by AA, it's fine.
will check the rest when i go home
many thanks for your advice

DanClarke · Mar 8, 2020

alan1973 said:
battery checked by AA, it's fine.
will check the rest when i go home
many thanks for your advice

Glad to hear it. Define "fine"?
A battery that's fine has a resting voltage above 12.5V (the higher the better) a battery that dips <11V when cranking is kaput.
Are you saying the AA bod did a heavy-discharge test on your battery?
If starting load pulls the battery too low it corrupts many of the electronic systems and weird things then happen.
I would still get a 2nd opinion. Best of Luck! Hope you have no further issues.

alan1973 · Mar 29, 2020

yes, AA checked the voltage is 12.5V.
took the car to dealership for a full service and told them the problem. unfortunately they couldn't find any, what they can do is that let me take the car straight away when this happen again and then they will have a erro code.
what i suspect is something lose or exposed ( wire or seal ?), when road surafce is wet, water go to inside of the car, then caused a electrical problem.
i am thinking take it to a specialist ( landrover), maybe he knows more ?

Hippo · Mar 29, 2020

The car will already have error codes in it logged to time, date and mileage from when it happened before. The dealer can clear them and you can then drive it until it happens again and new codes will be logged. The codes already in it should help. Is the sunroof leaking? Has the windscreen been changed?

J_D · Mar 30, 2020

alan1973 said:
yes, AA checked the voltage is 12.5V.
took the car to dealership for a full service and told them the problem. unfortunately they couldn't find any, what they can do is that let me take the car straight away when this happen again and then they will have a erro code.
what i suspect is something lose or exposed ( wire or seal ?), when road surafce is wet, water go to inside of the car, then caused a electrical problem.
i am thinking take it to a specialist ( landrover), maybe he knows more ?

I'd question the ability of the "dealership" thats done a full service with the advice to go back if it happens again!!
Error codes are logged for that reason, so if the fault is intermittent it can be rectified.
If you want a LR specialist then maybe post your location for some recommendations.
If you read a lot of the problem posts you'll see garages arent magicians and youre better off spending money for a good knowledgeable service.
The water issue sounds feasible so I'd also have a check over for any signs, water has a habit of travelling as well, so don't assume it won't reach everywhere!!

johnlad · Mar 30, 2020

Have the alternator checked. Also what make is it because these cars won’t tolerate crap alternator has to be a Denso

alan1973 · Apr 1, 2020

I live in Glossop near Manchester.
The car always has been serviced in Williams landrover dealership. the only thing I done for a tracking is in Kwik fix, and the problem generated after the tracking fix.
There is a landrover specilist in where junction 24 M60, not sure they are good or not.

alan1973 · Apr 1, 2020

i suspect alternator too, but williams landrover detected nothing from their PC ( i guess they only know problem from PC rather than common sense).
I am going for a caravan trip after this virus ends, so i won't wait till the problem comes again.

brianp38dse · Apr 2, 2020

I would have a look round to see if kwikfit buggerd any wiring up whilst doing the tracking.

J_D · Apr 2, 2020

Is there an earth strap the may have got damaged?

alan1973 · Apr 2, 2020

brianp38dse said:
I would have a look round to see if kwikfit buggerd any wiring up whilst doing the tracking.

I suspected too.
also friend of mine told me that Kwikfit sometimes create problem for more work, hopefully that's not the case.

My disco4 everything is faulty when road is wet

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