P0505 Mercedes-Benz Code - Idle Control System Malfunction
Quick Answer
This system automatically controls engine idle speed to a specified level. Common causes include Faulty IACV-AAC valve, IACV-AAC valve harness is open or shorted, IACV-AAC valve circuit poor electrical connection. 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
- P0505 Mercedes-Benz indicates Idle Control System Malfunction.
- Common causes
- Common causes include Faulty IACV-AAC valve, IACV-AAC valve harness is open or shorted, IACV-AAC valve circuit poor electrical connection.
- 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 P0505 Mercedes-Benz Description
One step of IACV-AAC valve movement causes the respective opening of the air by-pass passage. (i.e. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in 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 takig into consideration various engine conditions, such as during warm up, deceleration, and engine load (air conditioner, power steering and cooling fan operation).
What are the Possible Causes of the DTC P0505 Mercedes-Benz?
- Faulty IACV-AAC valve
- IACV-AAC valve harness is open or shorted
- IACV-AAC valve circuit poor electrical connection
How to Fix the DTC P0505 Mercedes-Benz?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0505 Mercedes-Benz 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.
Need more information about the P0505 Mercedes-Benz code?
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Frequently Asked Questions about P0505 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0505 in a Mercedes-Benz related to the Idle Control System Malfunction?
- Common symptoms include erratic idling, high idling speed, stalling at idle, and potential engine misfires.
2. What are the possible causes of the OBDII code P0505 in a Mercedes-Benz Idle Control System Malfunction?
- The most common causes include a faulty idle air control valve, vacuum leaks, dirty throttle body, or issues with the engine's computer.
3. How can I diagnose the OBDII code P0505 in a Mercedes-Benz related to Idle Control System Malfunction?
- Diagnosis typically involves checking the idle air control valve, inspecting for vacuum leaks, cleaning the throttle body, and using a diagnostic scanner to read the code.
4. What are the repair options for fixing the OBDII code P0505 in a Mercedes-Benz Idle Control System Malfunction?
- Repairs may include replacing the idle air control valve, fixing any vacuum leaks, cleaning the throttle body, resetting the engine computer, or updating software if necessary.
5. Can driving with the OBDII code P0505 in a Mercedes-Benz Idle Control System Malfunction cause further damage?
- Continued driving with this issue may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.
6. Is it safe to continue driving my Mercedes-Benz with the OBDII code P0505 related to Idle Control System Malfunction?
- It is generally not recommended to drive the vehicle with this code active as it can affect the engine's performance and potentially lead to further issues.
7. How much does it typically cost to repair the OBDII code P0505 in a Mercedes-Benz Idle Control System Malfunction?
- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 for simple fixes like cleaning the throttle body to $500 or more for parts replacement.
8. Can I reset the OBDII code P0505 in a Mercedes-Benz related to Idle Control System Malfunction myself?
- You can clear the code using an OBDII scanner, but it is important to diagnose and address the underlying issue causing the code to prevent it from coming back.
9. What are some preventive maintenance tips to avoid the OBDII code P0505 in a Mercedes-Benz related to Idle Control System Malfunction?
- Regularly cleaning the throttle body, checking for vacuum leaks, and ensuring proper engine maintenance can help prevent issues leading to this code.
10. Will replacing the idle air control valve fix the OBDII code P0505 in a Mercedes-Benz Idle Control System Malfunction?
- In many cases, replacing a faulty idle air control valve can resolve the P0505 code, but it is important to diagnose the issue accurately to ensure the correct repair.
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