P2503high severityPowertrain
Charging System Voltage Low
on 2018 Mazda Mazda3 2.0L I4 · FWD
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
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1