I recently bought an Ancel car diagnose tool and ran a quick scan to see if there are any faults. The only fault I got in the report is P199E00 - Cylinder head coolant valve Open circuit. I searched this online and didn't find enough information.

 

 

Even though there were no indicators/warnings on the dashboard, I brought this to a different garage instead of the one I used for previous services. The mechanic (and the owner of the garage) asked me all the correct questions and then inspected the engine. He actually predicted the exact issue just by listening to me even before checking the vehicle.

 

My car originally comes with a switchable water pump that is described here in this video[1].  The mechanic at this garage showed me that the car has been fitted with a non-switchable water pump instead of a switchable one. The solenoid that is supped to be connected to the (switchable) water pump had been left just hanging.

 

(Then I realised what has happened. A while ago, I got the Timing Belt + Water Pump replaced on my car after reaching the recommended mileage for Timing Belt replacement. That was a different garage based on where I live. People in that garage where I got the Timing Belt + Water Pump replaced had fitted a non-switchable water pump. The difference can be spotted in the following two Water pump and timing belt kits)

 

 

I asked my new mechanic if I should immediately get the water pump changed to a switchable one. But he described the additional tasks that the switchable pump performs in comparison (that are described in this video) and told me that it is OK to leave the current pump as it is until the next timing belt change. He diagnosed the car by attaching a diagnosis tool and confirmed that there were no other issues.

 

I would like to know everyone's opinion on this if they have come across this very issue by any chance.

 

Also, I noticed a lack of heat in the driver-side air condition/flow vents during the winter, which is connected to the heater matrix as I learnt. (Maybe this issue, the non-switchable pump has contributed to causing that heating issue as well). I am planning to get this also checked/fixed when I find time and I will update the observations/results here as well. I only mention this here for the benefit of anyone who has come across the same set of issues.

 

[1] 

https://www.youtube.com/watch?v=TEap0nuVrE8&ab_channel=febi.bilstein

Hi all,

 

I recently purchased a 2016 2.0 TDI CR Octavia with 105 000 miles and after scanning it with my obd tool, I noticed the same error code P199E00 - Cylinder head coolant valve Open circuit. I have been trying to find any information online but seem to struggle. Interestingly, the cambelt with pump were done at 65K and the receipt says that an electric water pump was fitted. Rarely, I also notice the P199D00 Error code (short circuit to ground), but currently not present. With this respect, I found that this could be caused by a damaged wire harness ( see below).

 

Some extra infos: I have not observed any coolant loss or overheating (yet).

 

My actual questions are:

 

• I would assume that I actually have an electric water pump fit, hence, do you think that the error code is a sign of a failing water pump or rather the electric valve inside? It has done 40K already, which generally means (according to other posts in this forum) that it should be replaced soon.
• Do you think that the problem is actually the wire harness?
• Would it matter if I keep on driving like this? I assume that it is ok, just the engine won't be as economical as it should be, right?
• Any ideas how to troubleshoot and figure out the root cause?

 

Many thanks in advance!

 

Hello all,

 

I finally figured out what the problem for me was. Apparently, the connector between the water pump and the ECU harness was not plugged in properly. It did look as if it was, however the connector was not properly "clipped in" which caused the open circuit error message. I can only assume that this has been like that since the water pump was changed (almost 50000 miles ago).

 

Hope this helps other too.

On 09/07/2024 at 11:55, dkutsarov said:

Hello all,

 

I finally figured out what the problem for me was. Apparently, the connector between the water pump and the ECU harness was not plugged in properly. It did look as if it was, however the connector was not properly "clipped in" which caused the open circuit error message. I can only assume that this has been like that since the water pump was changed (almost 50000 miles ago).

 

Hope this helps other too.

This happened to me when I re-assembled the thermostat and water pump module on my ea888 gen 3. Instantly gave the same fault I had before changing. Unfortunately I didn’t check it until it was pretty much back together, which meant another round of disassembly and reassembly. In my case the inner o ring on the plug had moved and was obstructing the plug pushing home properly. Even the the locking clip engaged, the plug contacts were not connected…..I won’t make that mistake again…