P0506 Subaru Code - Idle Speed Control System RPM Lower Than Expected
Quick Answer
The Engine Control Module (ECM) controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. Common causes include Dirty throttle body, Electric throttle control actuator misadjusted or damaged, Faulty Electric throttle control actuator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0506 Subaru indicates Idle Speed Control System RPM Lower Than Expected.
- Common causes
- Common causes include Dirty throttle body, Electric throttle control actuator misadjusted or damaged, Faulty Electric throttle control actuator.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0506 Subaru Description
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan operation, etc.)
What are the Possible Causes of the DTC P0506 Subaru?
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
How to Fix the DTC P0506 Subaru?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0506 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0506 Subaru Code
1. What are the common symptoms of OBDII code P0506 in a Subaru?
- Common symptoms include stalling at idle, fluctuating idle speed, rough idle, and potential engine hesitation.
2. What are the typical causes of OBDII code P0506 in a Subaru?
- The most common causes of this code are a dirty or faulty idle air control valve (IACV), a vacuum leak, a malfunctioning throttle body, or a faulty throttle position sensor (TPS).
3. How can I diagnose the cause of OBDII code P0506 in my Subaru?
- Diagnosis involves checking the IACV for proper operation, inspecting for vacuum leaks, testing the throttle body and TPS, and ensuring proper electrical connections.
4. Can a dirty throttle body cause OBDII code P0506 in a Subaru?
- Yes, a dirty throttle body can restrict airflow and cause the idle speed control system to operate improperly, triggering code P0506.
5. Is it safe to drive my Subaru with OBDII code P0506?
- It is generally not recommended to drive with this code, as it can affect engine performance and potentially lead to further issues if left unaddressed.
6. How can I repair OBDII code P0506 in my Subaru?
- Repair options include cleaning or replacing the idle air control valve, fixing any vacuum leaks, cleaning the throttle body, or replacing the throttle position sensor if necessary.
7. Can a bad oxygen sensor trigger OBDII code P0506 in a Subaru?
- While it is less common, a faulty oxygen sensor can sometimes cause an incorrect air/fuel mixture, leading to irregular idle speeds and potentially triggering code P0506.
8. Does OBDII code P0506 affect fuel efficiency in a Subaru?
- Yes, since the idle speed control system plays a role in maintaining optimal fuel combustion, a malfunction in this system can lead to decreased fuel efficiency.
9. Should I reset the OBDII code P0506 in my Subaru after making repairs?
- Yes, it is recommended to clear the code using an OBDII scanner after repairs have been made to see if the issue has been successfully resolved.
10. Can a disconnected or malfunctioning battery trigger OBDII code P0506 in a Subaru?
- Yes, disconnecting the battery or experiencing a low battery voltage can sometimes cause the vehicle's computer to reset its learned idle settings, potentially triggering code P0506.
Discuss the causes and fixes for P0506 Subaru OBDII Code
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PROBLEM: My 2005 Subaru Impreza RS was stolen via hot-wiring. When it was returned, this code came up after reconnecting the battery. The vehicle stalled every time it should have idled.
SOLUTION: In order to fix it, I cleared the codes, and drove the car to a much higher altitude (2000+ foot difference). Every 1000 ft in elevation I would pull over and shut the car off and turn it back on. My theory is that the car changed the Air/Fuel mixture based on the altitude.
OUTCOME: Although it took 100 miles and a few hours, the computer adjusted automatically and the problem is now gone.
Hope this Helps,
-Stevo in CO -
I changed the battery on my 05 Outback & the problem started - my AC is also not cooling.
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