Error Code 9020

[jasonyw]

I have a 2005 W211 and with DAS I got the following:

Component M13 (Heating water circulation pump) has Short circuit or open circuit
or Excess temperature. ( If fault code occurs with no complaint reported and no​

malfunctions, erase fault memory and perform a function check. )

How do I fix this problem?

The pump seemed to be OK as I can switch it on or off with WIS.

 

[Dieselman]

Erase the code and wait to see if it happens again.

 

[jasonyw]

It came back the same error code.

I believe the coolant has not been changed for 4 years, will it make any different if I change it?

Or has it got to do with the duo valves?

There was a Traffic Master TMC module and I disconnected the power to this module.

 

[BlackC55]

Ignore it. It means nothing.

This is the problem with people with DAS and not used to the system. They think there is a fault and there is none. Sporadic fault code always come up esp with the 211.