P3603high severityPowertrain
Enhanced Starter Motor Control Module Fault
on 2015 Toyota Avalon 3.5L V6 · FWD
What this code means
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.
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