P0505 on Honda Civic FC: Idle Control System Malfunction
Short answer: P0505 means “Idle Control System Malfunction”. The car’s computer has found a fault in the Engine system and turns on the Check engine light (MIL). First check: read the code and freeze-frame data with an OBD-II scanner.
Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.
- Code
- P0505
- System
- Engine
- Dashboard light
- Check engine light (MIL)
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
- Source
- obd-codes.com
Symptoms and when it is set
- Check engine light on
- Engine stalls and may not idle unless throttle is depressed
- Intermittently stalls when letting off the throttle
- Engine may idle too high
Likely causes
- Potential causes of an P0505 code include
- IAC motor connector is damaged (check connector and pins for damage, and moisture)
- One or more IAC circuits open or shorted to ground
- One or more IAC circuits are shorted to voltage
- IAC has failed
- PCM has failed
What to check, in order
- Read the code and freeze-frame data with an OBD-II scanner
- Check the connector and wiring of the part named in the code
- Test the part with scanner live data or a multimeter, using the values in the repair manual
- Fix the cause, clear the code and test-drive
Related on this car
Same code on other cars
- P0505 · Toyota Passo (1st gen)
- P0505 · Toyota Vitz (1st gen)
- P0505 · Toyota Corolla (9th gen, E120)
- P0505 · Toyota Corolla (11th gen, E170)
- P0505 · Toyota Corolla (10th gen, E140)
- P0505 · Honda City (5th gen, GM2)
- P0505 · Suzuki Wagon R (Pakistan, K10B)
- P0505 on all cars compared
Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.