Red brake light and abs light


Registered User
I have an a4 b6 avant 54 reg 1.9tdi sport
I have recently noticed with the cold weather when I start the car I get a red light saying brakes and then abs light on, happens mainly when it's been cold, but started randomly doing it but only on start-up
Battery was fully charged a few days ago, brake fluid is full
Scan shows
65535 internal control module memory error 00-00
18057 powertrain data bus P1649 35-00 missing message from abs controller

Any ideas

Mike B

Registered User
My 2.5tdi does it mainly in cold weather.I think its the sensor under the fluid reservoir that gets triggered by the current and its not easy to fix


VCDS Map User
Battery is on it's way out mate. I had the exact same issue some years ago & changed the battery and never had the issue again.