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P0506 Nissan 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 Nissan 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.
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Code Popularity 36,294
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Apr 22, 2019
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Code P0506 Nissan Description

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. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The ECM calculates the actual engine speed from signals of crankshaft position sensor (POS) and camshaft position sensor.
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.)
OBDII Code P0506 Nissan - Idle Speed Control System RPM Lower Than Expected - AutoCodes.com
P0506 Nissan Code - Idle Speed Control System RPM Lower Than Expected
What does this mean?

What are the Possible Causes of the DTC P0506 Nissan?

  • Dirty throttle body
  • Electric throttle control actuator misadjusted or damaged
  • Faulty Electric throttle control actuator
  • Electric throttle control actuator harness is open or shorted
  • Electric throttle control actuator circuit poor electrical connection
  • Intake air leak

How to Fix the DTC P0506 Nissan?

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.

What does this mean?

Code Tech Notes

If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replace the Electric Throttle Control Actuator (Motor) to repair the problem.

For older Nissan models (before 2002 model year):
- Faulty Intake Air Control (IAC) valve
- Intake Air Control (IAC) valve harness is open or shorted
- Intake Air Control (IAC) valve circuit poor electrical connection

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0506 Nissan 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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Information for Specific Nissan Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0506 Nissan Code

No Frequently Asked Questions about P0506 Nissan Code found.

Discuss the causes and fixes for P0506 Nissan OBDII Code

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  • How do I replace the idle speed in my 2005 Nissan Altima

    Reply to Comment

  • The idle speed is not component, is the engine speed when is a stop. What control the engine speed is the throttle body. So if your have the P0605 code, you may have to replace the throttle body.

    Reply to Comment
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