Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Jeep Commander Base, 3.7 K, RWDFACTORY OEM SERVICE PROCEDURE
DTCS P0339 To P0507
- P0339-Crankshaft Position Sensor Intermittent
- P0340-Camshaft Position Sensor Circuit
- P0344-Camshaft Position Sensor Intermittent
- P0401-EGR System Performance
- P0403-EGR Solenoid Circuit
- P0404-EGR Position Sensor Rationality Open
- P0405-EGR Position Sensor Circuit Low
- P0406-EGR Position Sensor Circuit High
- P0420-Catalyst Efficiency (Bank 1)
- P0430-Catalyst Efficiency (Bank 2)
- P0440-General EVAP System Failure
- P0441-EVAP Purge System Performance
- P0443-EVAP Purge Solenoid Circuit
- P0452-EVAP Pressure Switch Stuck Closed
- P0455-EVAP Purge System Large Leak
- P0456-EVAP Purge System Small Leak
- P0457-Loose Fuel Cap
- P0461-Fuel Level Sensor 1 Performance
- P0462-Fuel Level Sensor 1 Circuit Low
- P0463-Fuel Level Sensor 1 Circuit High
- P0480-Cooling Fan 1 Control Circuit
- P0481-Cooling Fan 2 Control Circuit
- P0501-Vehicle Speed Sensor 1 Performance
- P0503-Vehicle Speed Sensor 1 Erratic
- P0506-Idle Speed Performance Lower Than Expected
- P0507-Idle Speed Performance Higher Than Expected
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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