P2501high severityPowertrain
Generator Lamp/L Terminal Circuit High
on 2004 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
High signal on alternator exciter circuit.
Symptoms
- Battery light behavior abnormal
- Overcharging possible
- Check engine light
Common causes
- Short to voltage in exciter wire
- Voltage regulator fault
- ECM communication issue
Diagnostic steps
- Measure exciter circuit voltage
- Check for shorts to power
- Test alternator output
Repair notes
Repair wiring or replace alternator.
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