48V System Energy Recovery Rate Low
2016-2021 Mazda CX-3 2.0L I4
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P3807 on Other Vehicles
Common Questions
What does code P3807 mean on a 2016-2021 Mazda CX-3?
P3807 stands for "48V System Energy Recovery Rate Low". The 48V mild hybrid system is not recovering the expected amount of kinetic energy during deceleration and coasting events.
What are the symptoms of P3807 on a Mazda CX-3?
Common symptoms of P3807 include: 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.
What causes P3807 on a 2016-2021 Mazda CX-3?
Common causes of P3807 include: 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.