p28100 control circuit for coolant bypass valve

[leonlad]

got this pop up when i scanned wth vcds

looking at the coolant tank it is below the line

is this simply a sensor fault or just low or something else going on leak etc

i have a bottle of g12 plus plus can i use this instead of g13 ?



Address 01: Engine Labels: 06K-907-425-V1.clb
Control Module Part Number: 8V0 906 264 B HW: 06K 907 425 A
Component and/or Version: 1.8l R4 TFSI H09 0002
Software Coding: 0B2500322424010B0000
Work Shop Code: WSC 00049 770 00127
ASAM Dataset: EV_ECM18TFS0218V0906264B 001002 (SE37)
ROD: EV_ECM18TFS0218V0906264B.rod
VCID: 3B7F6A2EB265A94BDE-806E
1 Fault Found:

15462 - Control Circuit for Coolant Bypass Valve
P2681 00 [039] - Open Cricuit
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 50097 km
Date: 2023.08.01
Time: 12:50:38

Engine RPM: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 53 °C
Intake air temperature: 48 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 12.148 V
Unlearning counter according OBD: 40
Engine: operating status: ES
Engine temp. management actuator: raw value: 1470
Engine temperature management actuator: stop open: 139
Engine temperature management actuator: after-run stop: 3955
RVC_SP: 88.75 °
RVC_AV: 89.20 °
RVCPWM: 0.000 %

 

[RUM4MO]

On the question concerning is G12++ okay to use with G13, I'd say yes - okay the overall system protection will have been dropped slightly towards the G12++ protection level from the supposedly improved G13 protection, though mainly, I think, G13 was very similar to G12++, just manufactured in a slightly more environmentally friendly way.

Maybe if you solve this sensor issue, by replacing it if it keeps on repeating logging that fault, then it will be time to consider dropping out the entire load of G13 and refill with G12evo.

Edit:- oh, and get rid of the "mit silikat" either by removing the pouch if that is inside the tank, or get a new reservoir without that stuff, when you change to G12evo!

 

[leonlad]

On the question concerning is G12++ okay to use with G13, I'd say yes - okay the overall system protection will have been dropped slightly towards the G12++ protection level from the supposedly improved G13 protection, though mainly, I think, G13 was very similar to G12++, just manufactured in a slightly more environmentally friendly way.

Maybe if you solve this sensor issue, by replacing it if it keeps on repeating logging that fault, then it will be time to consider dropping out the entire load of G13 and refill with G12evo.

Edit:- oh, and get rid of the "mit silikat" either by removing the pouch if that is inside the tank, or get a new reservoir without that stuff, when you change to G12evo!

cheers

topped it up but fault remains. i noticed the coolant bottle sensor wire loom plug was wet inside when i took it off and a bit corroded.

would this create the same fault though ? or is my water pump on the way out , it`s such a low mileage car though

 

[leonlad]

anyone else had this error ?

should i plug in a new 4H0121671D but not fit it to see if the error goes ?

 

[leonlad]

after weeks of messing about with this, turned out it was the thermostat housing water pump that needed replacement. luckily i found a brand new INA one on ebay so bought that and took it to a vag specialist to fit hopefully i will have no further issues with this, the quoted prices are shocking really considering its some moulded plastic and an impeller.