Random fault code P16C7, anyone had this? Octavia MK3 DSG 2.0D

[mattfilmguy]

So my wife is away for 2 days on a training course. Drive up near Sheffield in my MK3 Elegance estate 2.0 diesel DSG. The place is down some bumpy old lanes and after dropping her off I clock an engine management light. So I do the usual things. Turn off ignition and back on, still there. Leave it over night, still there. 

 

So so I ordered a fault reader and it popped up P16C7. Having had a good search, this relates to rear engine mount actuator ( as per the attached image) . It’s booked in to have the gearbox oil changed as it’s just gone over 40k. But it’s really got my head scratching, could a bumpy road cause this? I wasn’t going fast due to kids and dog in car. Literally i’m Wracking my brain for of unusual things I’ve done. The only other odd thing I can think is using ASDA fuel which I never typically do, though I even used an additive as I was worried about fuel quality.

 

After turning the fault off Monday night, it’s popped back on almost 20 hours later. I’ve been out in the car but made only 2 journeys of about 3 miles each. I should also add that the car is making zero noticeable noises, clinks or is having performance issues.

 

I’d really appreciate some help.

[ahenners]

The fault returned in the OBDEleven lookup is "heater support pump locked".

 

[mattfilmguy]

1 minute ago, ahenners said:

The fault returned in the OBDEleven lookup is "heater support pump locked".

 

Ok, wow thanks for your quick search. Does it have steps to remedy the issue? And it’s locked as in seized or blocked? 

[ahenners]

Just now, mattfilmguy said:

Ok, wow thanks for your quick search. Does it have steps to remedy the issue? And it’s locked as in seized or blocked? 

 

Nothing further I'm afraid:

 

 

[mattfilmguy]

So apparently P prefix relates to Powertrain. Having looked on some VW forums it seems to allude to a parking/ auxiliary heater fitted to all diesel cars. Supposed to help heating first thing. Still not that far further but interesting development.

[maul]

If you can find the pump I would check the connections to it. As you said you were driving over a bumpy road before the fault showed up, it's highly possible you shook something loose.

Before you ask I don't have a clue where that pump is. hopefully we have someone around who does though 

[Gabbo]

If its going to the garage anyway, just get them to look at it.

The diesel auxillary heater is only fitted in very cold markets or perhaps as an optional extra if you buy a winter pack.

Its around €1000 option so you should know if you have it, unless you bought the car second hand.

If you have one, there are setting in the Entertainment unit menu to set times for it to come on in the morning/afternoon etc.

 

What kind of additive are you adding to the fuel?

[mattfilmguy]

Hi all. Having scoured the VW forums, I've located where the unit lives and will do a visual check to see if anything has unclipped/disconnected itself. The car is second hand and from my research is something that wasn't and isn't available on UK cars. I've never casually seen any such settings in the MiB system. Though  I'm starting to think it's the micro-circuit element of one of the several heater units, having found a great explainer pdf online. 

[ahenners]

My (limited) understanding from a quick bit of research last night after looking up the code, is the V488 is for the cooling micro-circuit and thus not related to the auxiliary heater which is not fitted to UK models anyway.

 

See page 18;

 

https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://pics3.tdiclub.com/data/517/820433_EA288.pdf&ved=2ahUKEwim1P62_MjZAhUVOsAKHQpFCx0QFjALegQIBRAB&usg=AOvVaw1AYT7nWmoRIINjta8HWwh_

 

It may also be worth scanning for fault codes with VCDS or OBDEleven, if the original fault code was obtained with a generic reader. Especially as your initial search for the code returned brought a very different diagnosis. 

[mattfilmguy]

So spoke with a local VAG specialist independent garage. I spoke about the issue and he immediately recognised it. Apparently he sees it frequently on VW Golfs. The V488 unit is apparently very cheaply made and the mech can wear, causing the plastic blade element to foul it’s inner chamber and it then smashes itself. One detecting the lack of rotation apparently the management module locks the pump. Apparently this is a weird translation from the original terminology. It essentially isolates the power supply. He’s doing the DSG oil change for £179 and then the  pump for £50 fitting and the part at £80.

 

So fingers crossed that’s the extent of the issue. Will report back after it comes out do the garage next Wednesday. 

[automass]

Sorry to make this thread come in to live. this post is similar to my problem. if anybody can help me, would be appreciated. I have just bought this 2nd hand car two days ago. it blows normal air even in 23.5 or 24 setting..but my 2013 (same car) would blow warm air in 21. I diagnose this car and it gave me Trouble codes: P16C700 - Heater support pump locked.

Could anybody tell me where is this Heater support pump located in my car..Can i not unlock it myself? what is the best way to sort this out and get my blower operate in normal manner?

[paulatthehug]

On 03/03/2019 at 20:58, automass said:

Could anybody tell me where is this Heater support pump located in my car.

 

On my Skoda, judging by where the VAG Roadside Assistance man was groping about when he was connecting and disconnecting it after he found it reporting P16C700, it's on the radiator side of the engine low down on the driver's side.

Edited 20 May, 2019 by paulatthehug

[meekhong]

Hi guys,

I know this is an old post but I have the same issue and it just today. I went to a local garage with a diagnostic report heater pump fault. He erased the fault and it the engine warning light went off after 3 hours. When I parked the car and engine off for about 20 minutes and turned the ignition On, the warning light is gone  but it's back again after 30-45 minutes after. So I went home drove the car jaut over an hour and checked with OBII code reader, it shows P16C7!!!

 

My BIG question is, IS IT STILL SAFE TO DRIVE the car(skoda octavia 2017 1.6 DSG)either long or short journey?

 

Highly appreciate if someone can reply ASAP before I drive more and wreck the car!

[Dansworld]

Same issue for me yesterday, did you get yours sorted?