P0506 on Toyota Corolla E140: Idle Control System RPM Lower Than Expected

Short answer: P0506 means “Idle Control System RPM Lower Than Expected”. 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

P0506

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

1. Check engine light on

Likely causes

1. A vacuum leak
2. An air restriction in the intake air path or exhuast
3. A faulty positive crankcase ventilation (PCV) valve
4. Damaged/failed/dirty throttle body
5. Internal engine problem
6. Failed PCM

What to check, in order

1. Read the code and freeze-frame data with an OBD-II scanner
2. Check the connector and wiring of the part named in the code
3. Test the part with scanner live data or a multimeter, using the values in the repair manual
4. Fix the cause, clear the code and test-drive

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0506 · Toyota Corolla (11th gen, E170)
• P0506 · Honda City (5th gen, GM2)
• P0506 · Honda Civic (10th gen, FC)
• P0506 · Suzuki Wagon R (Pakistan, K10B)
• P0506 on all cars compared

← P0505 P0507 →

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.