P2503high severityPowertrain
Charging System Voltage Low
on 2021 Ford Mustang Mach-E Standard Range Dual Motor AWD · RWD
What this code means
Charging system output voltage is below minimum threshold.
Symptoms
- Battery light on
- Dimming lights
- Slow cranking
- Accessories failing
Common causes
- Worn alternator
- Slipping belt
- High resistance connection
- Battery drawing excessive current
Diagnostic steps
- Measure voltage at battery and alternator
- Check belt
- Load test battery
- Check cable connections
Repair notes
Replace alternator. Inspect belt and cable connections.
Other Powertrain codes on this vehicle
P0070
Ambient Air Temperature Sensor Circuit
P0071
Ambient Air Temperature Sensor Range/Performance
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