DTC Volkswagen U0404 Short Explanation 

The video focuses on the basic Volkswagen specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error
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Make:
Volkswagen
Code:
U0404
Definition:
Battery Block 3 Becomes Weak
Description:
Presence of a malfunctioning block is determined based on each battery block voltage (1 trip detection).
Cause:
HV battery Battery smart unit