Aux Water Pump - P2600 error code

Afternoon all,
Looking for some help, I have a 2015 Sprinter 313 with a 2.1L engine. I have a P2600 error code coming up on the reader. When I clear the code it runs for a couple days with no issues then it comes on again.
Could someone please point me in the direction of where the aux electrical coolant pump is so I can check wiring/pump motor?

Thank you!

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