Mark200 Posted February 8, 2023 Share Posted February 8, 2023 2021 A3 Edition 1 (35 TFSI) If I have not used my car for say 3 days, when I go to start the car an error is reported that the 48v system is low but will recharge whilst driving. I have seen this many times with no impact on the car. Recently I had left my car for 2 weeks and when I came to start the car the same error was reported along with many others ( 48v charge system fail, Brake boost problem, Evap problem, Dealer Service Required and many more.) Surprisingly after driving for 5 minutes all of these errors disappeared, I used an OBDeleven device to see what faults had been recorded but none were present. Anyone else had any issues like this? Quote Link to comment Share on other sites More sharing options...
Stevey Y Posted February 8, 2023 Share Posted February 8, 2023 3 hours ago, Mark200 said: 2021 A3 Edition 1 (35 TFSI) If I have not used my car for say 3 days, when I go to start the car an error is reported that the 48v system is low but will recharge whilst driving. I have seen this many times with no impact on the car. Recently I had left my car for 2 weeks and when I came to start the car the same error was reported along with many others ( 48v charge system fail, Brake boost problem, Evap problem, Dealer Service Required and many more.) Surprisingly after driving for 5 minutes all of these errors disappeared, I used an OBDeleven device to see what faults had been recorded but none were present. Anyone else had any issues like this? Hi I think your battery may be failing as that would throw up most of the other codes, its worth getting a battery status check done with everything turned on, engine lights etc, and see what the voltage drop is like but from what you have described I think its more to do with lack of runs as its trying to tell you I need more electricity, thats why trickle charging is popular, my car is a 2016 with the original battery and no problem probably because it get charged for 150 miles a day as a cab. Steve. 1 Quote Link to comment Share on other sites More sharing options...
Steve Q Posted February 8, 2023 Share Posted February 8, 2023 I agree with Steve on this. Quote Link to comment Share on other sites More sharing options...
Mark200 Posted February 9, 2023 Author Share Posted February 9, 2023 Gents Thank you for your replies - not sure how to check the 48v battery voltage as it is all very well hidden and screwed down. Also cannot find an option to read Voltage /Capacity on the OBDeleven device - There is a selection for the mhev system (Battery Energy Module (21)), mainly software levels / serial numbers etc. 1st major service is due in April, I will report it to them and see what they say (Still under warranty 🙂 ) Cheers Quote Link to comment Share on other sites More sharing options...
Steve Q Posted February 9, 2023 Share Posted February 9, 2023 As it's still under warranty a failing battery should be covered. Quote Link to comment Share on other sites More sharing options...
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