Hi all,

I picked up an L405 4.4 SDV8 a month or so ago and recently got the restricted performance warning on the dash, a quick scan with my IID tool showed no engine faults but a fault under HVAC for B12A6-13 (2 Auxiliary heater water pump - general electrical failure - circuit open.

The car runs and drives fine once the code is cleared but I'd rather get it resolved, however there seems to be very little info on the pump on the SDV8 vs the pump on the older L322.

Anyone had this fault before and did replacing the pump actually resolve it?

Thanks in advance,

Martyn 2013 FFRR Vogue SE

It’s not the same unit as the 322. The Webasto unit was replaced with an erbspacher one. There is much less on them as they seem to go wrong less…..

If you download the WM from the wiki there is no doubt some info in there. It shouldn’t affect the car too much as it’s only the preheat and cabin warming that will be affected. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

Thank you, I did some digging via Topix and managed to find some info on replacement etc so have ordered a replacement pump (LR039070) for around £140. I've checked all the electrical connections and they seem find so pump is the next step. 2013 FFRR Vogue SE

Hi Martyn,

Did replacing the pump solve the problem? I have the same fault code and no working timed climate!!

Cheers

Mark

Hi Mark,

Yes, I've not seen the fault back since.

Thanks

Martyn 2013 FFRR Vogue SE

Excellent 👍🏻

I assume your fbh wasn’t working due to the faulty pump? Also, was it a fairly straightforward job to replace?

Cheers

Mark

i've had this issue also. Do anyone know if the failure is a mechanical issue generally? My warranty company fighting me on it. Warranty Wise.

Andrew --
On my third Full Fat RR

I had the same issu on mine - FBH would fire up but never warmed up. Turns out the pump for the FBH had failed - mine was replaced under warranty and its been fine ever since. Ash
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2016 SDV8 AB

Who was your warranty with?

Was it the aux water pump that had failed?

Was it a mechanical issue for warranty to cover it? --
On my third Full Fat RR

Hi Andrew,

I had a used car warranty through RAC.

It was a mechanical failure with a seized aux water pump which was replaced. Ash
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2016 SDV8 AB

thanks - precisely the sort of problem I'm having - the aux water pump has 'seized', and they're using that one word to say that it's not mechanical but somehow corroded or rusted shut. Fulls service history with correct liquids used etc. They're impossible. --
On my third Full Fat RR