Start-Stop 12V Battery State of Health Below Threshold
2011-2011 Mitsubishi Lancer 2.4L I4
The 2011 Mitsubishi Lancer is equipped with a 2.4L inline-4 engine. Below you'll find detailed p3606 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The 12V AGM or EFB battery state of health has degraded below the minimum threshold required for reliable start-stop operation.
Symptoms
- Start-stop permanently disabled
- Battery management warning
- 12V battery struggles in cold weather
- Electrical systems may exhibit issues
- Start-stop light always off
- Higher fuel consumption without start-stop
Common Causes
- Battery age exceeding service life
- Excessive parasitic draw degrading battery
- Battery not properly maintained
- Wrong battery type installed (non-AGM/EFB)
- Frequent short trips not fully recharging battery
Diagnostic Steps
- Read battery state of health via IBS/BMS
- Load test 12V battery
- Check battery type matches vehicle specification
- Test charging system output
- Measure parasitic draw
Repair Notes
Replace 12V battery with correct AGM or EFB specification. Register new battery with vehicle BMS. Standard flooded batteries are not suitable for start-stop vehicles.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3606 on Other Vehicles
Mitsubishi Colt JP
2010-2010 1.3L I4 4A90
Mitsubishi Colt JP
2010-2010 1.5L I4 4A91
Mitsubishi Colt JP
2011-2011 1.3L I4 4A90
Mitsubishi Colt JP
2011-2011 1.5L I4 4A91
Mitsubishi Colt JP
2012-2012 1.3L I4 4A90
Mitsubishi Colt JP
2012-2012 1.5L I4 4A91
Mitsubishi Delica D:5
2019-2019 2.2L I4 Turbo Diesel 4N14
Mitsubishi Delica D:5
2020-2020 2.2L I4 Turbo Diesel 4N14
Common Questions
What does code P3606 mean on a 2011-2011 Mitsubishi Lancer?
P3606 stands for "Start-Stop 12V Battery State of Health Below Threshold". The 12V AGM or EFB battery state of health has degraded below the minimum threshold required for reliable start-stop operation.
What are the symptoms of P3606 on a Mitsubishi Lancer?
Common symptoms of P3606 include: Start-stop permanently disabled, Battery management warning, 12V battery struggles in cold weather, Electrical systems may exhibit issues, Start-stop light always off, Higher fuel consumption without start-stop.
What causes P3606 on a 2011-2011 Mitsubishi Lancer?
Common causes of P3606 include: Battery age exceeding service life, Excessive parasitic draw degrading battery, Battery not properly maintained, Wrong battery type installed (non-AGM/EFB), Frequent short trips not fully recharging battery.
Last updated: March 2026