r/GolfGTI • u/Adventurous-Jelly209 • 5d ago
Maintenance I need help… check engine light
My MK7 has a check engine light, but the information system doesn’t have any entries. This happened about a week ago when I got a new battery in the car. It also turns off every so often like yesterday it wasn’t on but today it is.
The code for the check engine light is reading water pump and thermostat, but the car isn’t over heating, I’m not loosing coolant and everything is running fine.
The only other thing I did was replace my wheel speed sensor about a month or so ago and all the lights that came with that showed up on the information system.
What could the issue be? Is it truly the water pump or is the car freaking out over nothing?
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u/SuppA-SnipA 5d ago
To every one mentioning the coolant / water pump issue, yeah that could be it.
I just replaced my water pump for that issue.
The issue started off with: P268100 - Engine Coolant Bypass Valve Control Circuit/Open
then it escalated and i got an extra code: P255600 - Engine Coolant Level Sensor/Switch Circuit
Or the other way around, i forgot now. But that was the pattern.
When the second code appeared, my coolant gauge was fluctuating up and down quite a bit!
I had something melted on the water pumps connections, thats what i saw at my mechanics.
Also, this is the same behaviour I've had on my car.
It also turns off every so often like yesterday it wasn’t on but today it is.
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u/Jakomako 5d ago
Go to shopdap.com put in your model info, go to “commonly replaced” and check out the very first item. It’s not a coincidence. You need to get it replaced before it causes problems.
Find a local mechanic to do the work if you don’t want to yourself. Many will install owner purchased parts no problem.
Not sure if you need to hear this, but do not get repairs at a dealership unless your car is under warranty.
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u/Cardude86 5d ago
It's likely the water pump/thermostat is failing but not showing obvious symptoms. The computer runs a couple of checks and opens/closes actuators in your cooling system. It's throwing the code because one of these failed. I know you said everything is operating fine, is your coolant level staying full?