Enhanced Starter Motor Control Module Fault
2016-2021 Mazda CX-3 2.0L I4
Description
The enhanced or reinforced starter motor used in start-stop systems has a control module fault. These starters are designed for frequent cycling.
Symptoms
- Start-stop disabled
- Slow cranking after stop event
- Starter noise during restart
- Unusual vibration during start
- Increased restart time
Common Causes
- Starter control module failure
- Starter motor brush wear
- Pinion gear engagement issue
- Starter solenoid degradation
- Excessive starter motor temperature
Diagnostic Steps
- Read starter motor cycle count
- Test starter motor current draw
- Check starter engagement speed
- Monitor starter solenoid operation
- Measure voltage drop across starter circuit
Repair Notes
Replace enhanced starter motor assembly. Standard starters are not suitable for start-stop equipped vehicles.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P3603 on Other Vehicles
Common Questions
What does code P3603 mean on a 2016-2021 Mazda CX-3?
P3603 stands for "Enhanced Starter Motor Control Module Fault". The enhanced or reinforced starter motor used in start-stop systems has a control module fault. These starters are designed for frequent cycling.
What are the symptoms of P3603 on a Mazda CX-3?
Common symptoms of P3603 include: Start-stop disabled, Slow cranking after stop event, Starter noise during restart, Unusual vibration during start, Increased restart time.
What causes P3603 on a 2016-2021 Mazda CX-3?
Common causes of P3603 include: Starter control module failure, Starter motor brush wear, Pinion gear engagement issue, Starter solenoid degradation, Excessive starter motor temperature.