Body
generic / SAE
B0420
Audio System Internal Failure
The audio head unit reports an internal self-test failure. Symptoms include silent output, frozen display, or repeated reboots of the infotainment system.
SystemBody
Typegeneric / SAE
GroupB0
Range / number4 / 20
Possible causes
- Head unit internal fault high
- Software update required medium
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–2000 €
- Estimated time: 0.5–3 h
- Component: audio head unit
- Component: infotainment module
Sources
References
sae:J2012