Failure after driving through puddle

[Nigel6065]

I've been searching the internet for a few weeks and had no success, possibly because I am asking the wrong questions.

A few weeks ago my son drove through a deep puddle at approximately 50km/hour and 200-300m later the car cutout. It's a 2004 X5 3.0D

I waited a couple of days thinking it would dry out, but with no success. There is a clicking sound behind the passenger footwell which sounds like a relay cycling. It is also showing fuel injector and transmission faults on the dash and dash lights and gauges are going crazy. For example temperature gauge bouncing from min to max. The engine cranks but doesn't start.

I've got access to a scanner but am not familiar with using it.

I would really appreciate some pointers as it probably isn't economically viable to take it to a mechanic or auto electrician

[EODguy]

Check the wire loom plug where it goes into the transmission. Water ingress there has happened to several people on here.

What scanner do you have? It is the best tool you can have.

A bidirectional scanner like a foxwell nt-510, nt-520, ista-d, etc is what you want because many scanners can't gi into 2nd level menus and can't reset the codes.

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[Nigel6065]

Originally Posted by EODguy

Check the wire loom plug where it goes into the transmission. Water ingress there has happened to several people on here.

What scanner do you have? It is the best tool you can have.

A bidirectional scanner like a foxwell nt-510, nt-520, ista-d, etc is what you want because many scanners can't gi into 2nd level menus and can't reset the codes.

Thanks that is really useful I'll have a look.

The scanner is an INPA compatible scanner and using Bimmergeeks copy of the software. Have been very cautious as I've read you can do serious damage if you don't know what you're doing

[Clavurion]

Coolant temp gauge bouncing indicates intermittent CAN-bus connection from DDE (engine control unit) to instrument cluster (gauge goes to max if there is no CAN information when instrument cluster has ignition pos.2 power). Auto gearbog is also in the same CAN-bus. Like suggested check and clean the connector on auto gearbox (gearbox ECU is inside the gearbox). Just in case also check the E-box near firewall where DDE is located for possible water damage.

When doing basic diagnostics it's difficult to cause any more harm. So check the codes if you have any means.

How high did the water reach and for how long was the vehicle submerged?