Shunt/battery control module part-no

[T6_FunBus]

It does seem odd that it's always the LIN wire, you'd think it would be others with similar routing or from the same supply chain.

True, it seems to be more susceptible, either up near battery or underneath in the poorly protected and routed conduit. I’ve absolutely no doubt other wires will get damaged in the same area over time. They are pull back and forth to several clamps, and then many wires that exit are not protected, example, egr and charge cooler pump wires simply exit the conduit and are exposed.

 

[roadtripper]

Makes me wonder if I should consider precautions on my currently younger T6.1

 

[T6_FunBus]

Makes me wonder if I should consider precautions on my currently younger T6.1

To be honest, the more it’s left alone probably the better lol.

I did start wrapping all wires in the conduit, but then realised that would make any future inspections or repairs way more difficult, so chose to do similar to factory and just wrap ever now and then, but very spaced out. What I did do, is wrap the wires where they are clamped under the conduit, since that made sense to me - since if they are pulled onto a bracket, the exposed wires allowed to rub freely on the casing.

 

[T6_FunBus]

Wire replaced - it was actually still connected OK, just the sheathing had split, but I refreshed it anyway. Didn’t help with any of my other voltage related issues though.

 

[GonzaSM]

Just coming back to this.

So after replacing this module I had the same errors, my problem ended up being the green/yellow wire being broken (somewhere) between BCM, this battery module and the alternator.

I ended up rewiring all, and fitted a new LIN wire from BCM, to alternator, to battery module. My alternator, stop start, and battery monitoring control module errors then went away.

I have however noticed the red wire has a split in it (from vibrations) near the connector, so likely also has an intermittent connection.

I am currently troubleshooting a few errors:

00446 - Feature limitation due to insufficient voltage
P16CB00 - Heater support pump supply voltage

There has also been a long time ago a ‘reference voltage’ error. I have not seen this for a long time.

With the heater pump, I have had the pump replaced with a genuine VW item, I have also fully rewired and tried a new plug / connector but have the same issue.

Red battery light occasionally comes up on dash, so I am now wondering if the supply voltage error to the pump, is not a pump or pump wiring issue at all, but another problem…

I don’t believe the red wire on the above module will fix this, but then, I do not really know what the consequences are of it being damaged either are??

Hi mate,

Could you tell me about those errors/issues?
In my case:

• I get a start-stop error message on the display, and it is not working.
• The battery gets drained within 2 days (it is a new AGM battery installed a month ago)

When checking with VCDS, it shows two module errors, which could all be related to the battery management sensor issue.
As you described, maybe it is just a broken wire. I need to check it.