P3807moderate severityPowertrain
48V System Energy Recovery Rate Low
on 2019 Audi A6 3.0L V6 TFSI · AWD
What this code means
The 48V mild hybrid system is not recovering the expected amount of kinetic energy during deceleration and coasting events.
Symptoms
- Mild hybrid efficiency reduced
- 48V battery SOC not recovering during driving
- Higher fuel consumption than expected
- Regenerative coasting function weak
- 48V charge indicator shows low recovery
Common causes
- BSG belt slip during regeneration
- 48V battery near full charge
- BSG inverter limiting regen current
- Drive belt tensioner weak
- 48V battery temperature too high or low for charging
Diagnostic steps
- Monitor 48V regen current during deceleration
- Check drive belt tension and condition
- Read 48V battery charge acceptance limits
- Check BSG inverter regen current capability
- Monitor 48V battery temperature during regen
Repair notes
Replace drive belt and tensioner if slipping. Address 48V battery temperature management. BSG replacement if regen output is low.
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