Fuel Completion Return to Open Loop
2004-2008 Chrysler Pacifica 4.0L V6
Description
The PCM has detected that the fuel system failed to transition from open loop to closed loop operation within the expected time. This indicates the engine is running in open loop longer than normal, which reduces fuel efficiency and increases emissions.
Symptoms
- Check Engine Light
- Poor fuel economy
- Higher emissions output
- Rough idle when cold
Common Causes
- Faulty oxygen sensor not reaching operating temperature
- Engine coolant temperature sensor malfunction
- Exhaust leak before oxygen sensor
- Fuel pressure out of specification
- Vacuum leak preventing closed loop entry
Diagnostic Steps
- Monitor O2 sensor activity on scan tool to verify switching
- Check engine coolant temperature sensor reading vs actual temp
- Inspect exhaust for leaks near O2 sensor
- Verify fuel pressure is within specification
- Check for vacuum leaks
Repair Notes
Diagnose and repair the condition preventing closed loop operation, typically an O2 sensor or coolant temp sensor issue.
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
P1105 on Other Vehicles
Common Questions
What does code P1105 mean on a 2004-2008 Chrysler Pacifica?
P1105 stands for "Fuel Completion Return to Open Loop". The PCM has detected that the fuel system failed to transition from open loop to closed loop operation within the expected time. This indicates the engine is running in open loop longer than normal, which reduces fuel efficiency and increases emissions.
What are the symptoms of P1105 on a Chrysler Pacifica?
Common symptoms of P1105 include: Check Engine Light, Poor fuel economy, Higher emissions output, Rough idle when cold.
What causes P1105 on a 2004-2008 Chrysler Pacifica?
Common causes of P1105 include: Faulty oxygen sensor not reaching operating temperature, Engine coolant temperature sensor malfunction, Exhaust leak before oxygen sensor, Fuel pressure out of specification, Vacuum leak preventing closed loop entry.