P2502high severityPowertrain
Charging System Voltage
on 2016 BMW i3 Range Extender · RWD
What this code means
The system charging voltage is outside the expected regulation window.
Symptoms
- Battery light
- Check engine light
- Electrical accessories malfunction
- Battery drains overnight
Common causes
- Failed alternator
- Loose drive belt
- Battery terminal corrosion
- ECM-controlled charging fault
Diagnostic steps
- Check battery voltage engine off and running
- Inspect belt tension and condition
- Load test alternator
- Check battery terminals
Repair notes
Replace alternator or battery. Clean terminals. Check belt.
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P0070
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P0072
Ambient Air Temperature Sensor Circuit Low
P0073
Ambient Air Temperature Sensor Circuit High
P0115
Engine Coolant Temperature (ECT) Sensor 1 Circuit
P0116
ECT Sensor 1 Circuit Range/Performance
P0117
ECT Sensor 1 Circuit Low Input
P0118
ECT Sensor 1 Circuit High Input
P0119
ECT Sensor 1 Circuit Intermittent
P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control