P0563high severityPowertrain
System Voltage High
on 1998 Mazda B2500 2.5L I4 · FWD
What this code means
The system voltage is above the acceptable threshold.
Symptoms
- Check Engine Light
- Bulbs burning out frequently
- Battery swelling
- Electrical component damage
Common causes
- Faulty voltage regulator
- Faulty alternator
- Bad battery sense wire
- PCM-controlled charging issue
Diagnostic steps
- Test voltage at battery (should not exceed 15V)
- Test alternator regulator
- Check battery sense wire
- Test charging system
Repair notes
Overcharging can damage battery and electronics. Replace alternator/regulator. Urgent repair.
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