Engine-Codes - Chevrolet - P0506 Chevrolet

P0506 Chevrolet Code - Idle Speed Low

- Code Popularity: 62,220 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0506 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Dirty Throttle Body
  • Intake air leak
  • Throttle Body misadjusted or damaged
  • Faulty Electric Throttle Actuator Motor (Located in the Throttle Body Assembly)
  • Electric Throttle Actuator Motor harness is open or shorted
  • Electric Throttle Actuator Motor circuit poor electrical connection

Code Tech Notes

If there are no intake leaks, clean the throttle body, adjust the engine idle, and clear the engine code. If the code persists you must replace the Electric Throttle Actuator Motor (Located in the Throttle Body Assembly).

The Engine Control Module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may be set if the throttle position is not learned.

Chevrolet Throttle Body Cleaning and Idle Learning Procedure





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How to Fix the DTC P0506 Chevrolet?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0506 Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hard to start
  • Rough or erratic idle speed

What Does the P0506 Chevrolet Code Mean?

The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECM determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The Direct Current (DC) motor, located in the Throttle Body Assembly, drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate. The Diagnostic Trouble Code (DTC) will be set when the actual idle speed is approximately 94 RPM lower than the desired idle speed.

P0506 Chevrolet Code - Idle Speed Low

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