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Computer system being strange

Malky23

New member
Location
Scotland
Car(s)
2017 GTI 7.5
Hey guys, wondering if someone has any advice for me.

Yesterday and today my car has been acting strange. It's a golf 7.5 GTI with DSG 6 speed and for some reason the gear changes have been acting different. They have suddenly started changing up later at higher rpm and seems to not want to go into 6th gear. It's particularly noticeable in Eco mode. I can change up manually to 6th with the paddles but after a few seconds it jumps back to Eco 5. It appears as if it doesnt think I'm at the right speed for 6th gear or something (even at 60 on a flat road).

This isn't the only issue though, the temperature sensor for outside is now fixed on 49 degrees C, which is obviously nonsense for Scotland...! 😂

The only other issue I have noticed is with the AC control. I can turn on/off, change fan level etc but it won't change the temperature. Last setting I had it on was lo or 16 but I can turn it up past 20 and it's still blowing out cold air.

Any suggestions would be appreciated. I don't have a fault code reader but half tempted to go get one to see if it shows up anything. Also was thinking to do a full reset by disconnecting the battery and letting it discharge but not sure if this will cause any problems with resetting? Will anything need reprogrammed etc after a reset that will require a dealer? Or is any kind of reset possible to do myself?

Thanks for your help
 

BudgetPhoenix

Autocross Champion
Location
Kansas
Car(s)
2016 GTI S DSG
When the outside temp reaches like 110 F( 43C) or something it tells the ECU to start holding gears longer so might have something to do with your temp sensor. Id scan for codes though but with something like VCDS or OBDeleven a generic one wont scan all the modules in the car.
 

Malky23

New member
Location
Scotland
Car(s)
2017 GTI 7.5
When the outside temp reaches like 110 F( 43C) or something it tells the ECU to start holding gears longer so might have something to do with your temp sensor. Id scan for codes though but with something like VCDS or OBDeleven a generic one wont scan all the modules in the car.
Thanks for the quick reply. That makes sense. I guess that's a good starting point. Will ask around and see if anyone nearby has vcds
 

The Fed

Old Guys Rule
Location
Florida
On my MK7, the outside temp sensor is right inside the lower grille. I never had any problems with mine, but perhaps yours was damaged. A VCDS scan should show the problem, I agree the sensor is the most likely culprit. I always recommend buying VCDS, it's the best $200 you can spend.
 

Malky23

New member
Location
Scotland
Car(s)
2017 GTI 7.5
Thanks guys. Turns out it was the sensor after all. I removed the top grill and had a play about with the sensor and instantly saw the temperature slowly drop down to correct. Took it for a test drive and everything was back to normal. Temp has since risen back up and I felt the performance change again as it increased so I've ordered a new sensor.

Thanks for the help!
 
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