Samet
Transmission indicator light comes on during cold start
(Translated from German)
Summary of the thread
The Audi A7 displays a "Transmission system malfunction" error during cold starts, which disappears once the engine warms up. The issue is linked to an electrical fault with the cooling oil valve. The problem began after a battery change, which hasn't been registered with the vehicle's system. Registering the new battery may resolve the electrical issues and eliminate the error message.
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AUDI
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A7
CarlyMechanic
It's possible that the unregistered battery change is causing electrical issues, including the error message you're seeing. I recommend registering the new battery with your vehicle's system to ensure all electrical components are functioning correctly. This might resolve the issue. Let me know if this helps or if you have any further questions!