MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: jonnd on November 01, 2025, 02:08:24 am

Title: P2185 high-voltage circuit issue with the engine coolant temperature sensor 2
Post by: jonnd on November 01, 2025, 02:08:24 am
So check list i done so far.

My Aircon doesnt work atm need regasing,

Coolant wise i have had changed 4 sensors and 2 wiring harness and still nothing the only thing i havent touched is the fan controller on the fan which is working but come and off soon as i start the engine
Wiring i have checked ohms and beeper test all seems fine no break themo stat has been changed 2 times as well 2 differents engine and i still have the problem with P2185

Does anyone have any information or advice maybe a wiring dirgram so i can fully test all my wires

Could it be a blockage some where the coolant is getting to the sensor but is saying -45c on the vcds
(https://i.postimg.cc/nrwk5H3S/Whats-App-Image-2025-11-01-at-02-05-12-39901459.jpg) (https://postimg.cc/4HVVHTkp)

(https://i.postimg.cc/m2tV9Hr8/Whats-App-Image-2025-11-01-at-02-05-30-aacbfa12.jpg) (https://postimg.cc/kBPx3DKb)