15462 (P2681) Control circuit for coolant bypass valve

[hidnmine]

Hi,
I have this fault code on my 2017 Audi S1.
Am I correct in assuming that the "Coolant Bypass Valve" is the electrically operated thermostat?
Thanks,
Andy

 

[J0N]

The coolant bypass valve on an S3 8V opens to send hot coolant to the heater matrix once the engine is up to temperature, I imagine it’s the same with the S1.


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[hidnmine]

The coolant bypass valve on an S3 8V opens to send hot coolant to the heater matrix once the engine is up to temperature, I imagine it’s the same with the S1.


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Thanks Jon.
Do you know where the valve is located on the S3?

 

[J0N]

On the passenger side (UK) of the engine, you’ll need to remove the intake to get to it.


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[hidnmine]

Just to follow up on this problem. After changing the coolant bypass valve, the 15462 code cleared.
Unfortunately, it was replaced by a code (can't remember the number) indicating a faulty thermostat - apparently a very common problem.
Cheapest replacement (unbranded) from Ebay, about £100. Given the work involved in replacing it I went for a branded part - Meyle £280 from Germany, and a day's work to replace it!
Stripped the old part and found the motor pinion lying loose at the bottom (It's glued or pressed onto the motor shaft), so the valve was stuck shut.
I'm sure this is more accurate than the traditional thermostat (worked pretty well for the last 100 years), but really?? Dealer price £800+ to replace a thermostat??

 

[J0N]

The cooling system is very complicated on these, it seems a long time ago that you put a thermostat in a pan of boiling water to see if it was operating correctly. I’m not sure how common it is for the thermostat to actually fail, although unfortunately they do crack and leak at least once in the car’s lifetime it seems. Glad you got to the bottom of the problem.


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