Diff warning light flashing

[GeordieStu]

All, I have a 2017 T6/T32 Twin slider 4 motion (Auto) Diff lock warning light started flashing, but drives ok. VW specialist is struggling to find the issue as no fault code found. Any ideas to possible fault? please

 

[GeordieStu]

Update on Diff Lock warning light. My Van doesn't have the diff lock fitted. Any ideas why the warning light would be flashing if the Diff not fitted?

 

[DaveD]

Are you sure its not a Haldex fault warning, rather than a diff lock warning in a van with no diff lock?
Having said that, I'd expect a fault code to be logged if your Haldex was faulty.

 

[GeordieStu]

Are you sure its not a Haldex fault warning, rather than a diff lock warning in a van with no diff lock?
Having said that, I'd expect a fault code to be logged if your Haldex was faulty.

The garage is saying no fault codes. The van can drives well enough.

 

[doncarlyon]

On the VW app, it says my T6.1 has a diff lock. I don't have a button.

Wonder if yours is the same?

 

[GeordieStu]

Mines 2017 no button on the dashboard T6

 

[manfrotto]

I am assuming your VW specialist is using a VW specific Diagnostic tool (Odis/ VCDS etc) ?
Could you post a photo of the flashing light?
When was your Haldex last serviced?

 

[GeordieStu]

The Garage is VW specialist. The van had an engine service would the Haldex be serviced at the same time as part of an engine service? Can’t take a photo van is with them.

 

[manfrotto]

This is a good thread regarding the Haldex servicing....

Thread '4motion Haldex Service'

17 Oct 2023

Hi, Are all 4Motion’s on the Haldex system?

just been reading about the HALDEX Service?? Which I knew nothing about, so now a bit worried as I’m not sure when/if mine has been done.
Would this be picked up on The All In Service Plan as it’s not long been in for a service.
Thanks

• LeeroyRoberts
• 4motion haldex
• Replies: 16
• Forum: Engine, Gearbox, Exhaust, Drivetrain

• 

 

[DaveD]

The Garage is VW specialist. The van had an engine service would the Haldex be serviced at the same time as part of an engine service? Can’t take a photo van is with them.

No, unless you specifically asked for a Haldex service as well as a normal engine service, it wouldn't be done.

 

[manfrotto]

The Haldex Service interval is every 40k miles or 3 years, however more often is recommended as the flter screen gets gunked up and then the pump fails.
Therefore also ensure the filter screen is cleaned, not just the fluid chenged (which is all the main dealers will do unless specifically requested)

 

[GeordieStu]

The garage has established it’s an electrical fault. As I don’t have a diff lock and not the Haldex but something causing the fault sending false alarm message.

 

[GeordieStu]

Issue has been found. Control box on top of the Haldex full of water and corroded. Causing diff warning light to come on.
New unit from VW £784 inc vat plus labour £1,356.00

 

[DaveD]

Issue has been found. Control box on top of the Haldex full of water and corroded. Causing diff warning light to come on.
New unit from VW £784 inc vat plus labour £1,356.00

That's a lot of money but I'm glad you've finally resolved the issue.

 

[GeordieStu]

The garage N L Motors in Trowbridge spent more than 4hrs trying to diagnose the fault. They’re a good team. Service my van regularly.

 

[Bigsidavies]

@GeordieStu You can get the controller tested and exchanged by a company called Haldex Repairs. I was having the same issue as you, however the haldex controller had no water ingress.
Mine fixed itself when I floored it on a gravel car park and the Haldex got a big wake up call. Been fine since.

Heres the link to the refurb units.

Gen 2 & Gen 4 Haldex ECU Repair Service by Mail Order – Haldex Parts and ECU Repairs by Auto Fault Finder Ltd

www.haldexrepairs.co.uk