I have fault code P023B showing on my 1.6 TDI CR (163k miles). 
 

I think it might be something to do with the auxiliary coolant pump having an open circuit.  Hopefully not the water pump as the timing belt was changed not that long ago. 
 

Can anyone confirm? Thanks. 

The fault code is for the electronic coolant pump, the pump is a 3 wire setup (this is an example as I don’t know your engine code)

1) 12v feed

2) PWM signal to pump (this allows the current to flow from 1 to 3)

3) Earth
 

See pics 

1 hour ago, xpower said:

The fault code is for the electronic coolant pump, the pump is a 3 wire setup (this is an example as I don’t know your engine code)

1) 12v feed

2) PWM signal to pump (this allows the current to flow from 1 to 3)

3) Earth
 

See pics 

Hi that’s brilliant thanks. 
 

The engine code for my car is CLHA 77KW  

Thanks once again. Part ordered - £80 for original VAG part. Mechanic fitting on Monday. 

Hi did you get this fixed ? Is so what part did you order thanks 

On 20/01/2022 at 20:16, Ryry007 said:

Hi did you get this fixed ? Is so what part did you order thanks 

Hi. I had the electric coolant pump replaced but it turned out it was a broken wire as the code came back. So I would check the wiring before buying a new pump. 
 

I’m not sure what the part number was but he got a good deal on an original part from TPS. 

Edited 22 January, 20224 yr by gm73