P0505 1999 Honda Civic Code - Idle Air Control Valve
Quick Answer
This system automatically controls engine idle speed to a specified level. Common causes include Faulty Idle Air Control Valve (IACV) valve, IAC valve harness is open or shorted, IAC 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 1999 Honda Civic indicates Idle Air Control Valve.
- Common causes
- Common causes include Faulty Idle Air Control Valve (IACV) valve, IAC valve harness is open or shorted, IAC 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 1999 Honda Civic 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 taking 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 1999 Honda Civic?
- Faulty Idle Air Control Valve (IACV) valve
- IAC valve harness is open or shorted
- IAC valve circuit poor electrical connection
How to Fix the DTC P0505 1999 Honda Civic?
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
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0505 1999 Honda Civic 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 P0505 1999 Honda Civic Code
1. What does the OBDII code P0505 for a 1999 Honda Civic indicate?
The P0505 code on a 1999 Honda Civic specifically relates to a malfunction in the Idle Air Control (IAC) valve circuit.
2. What are the common symptoms of a P0505 OBDII code on a 1999 Honda Civic?
Common symptoms include erratic idle speed, stalling at idle, and the vehicle's engine running rough or inconsistently.
3. What are the potential causes of the P0505 code in a 1999 Honda Civic?
Possible causes include a faulty Idle Air Control (IAC) valve, a dirty or clogged IAC valve, vacuum leaks, or issues with the wiring or connectors related to the IAC valve.
4. How can I diagnose a P0505 code on my 1999 Honda Civic?
Diagnosis typically involves checking the IAC valve for proper operation, inspecting for vacuum leaks, testing the wiring and connectors, and scanning for any related trouble codes.
5. Can I drive my 1999 Honda Civic with a P0505 OBDII code?
It is not recommended to drive with a P0505 code as it can lead to poor engine performance, stalling, and potentially dangerous situations. It's best to address the issue promptly.
6. How can I repair a P0505 code on my 1999 Honda Civic?
Repair options may include cleaning or replacing the Idle Air Control (IAC) valve, fixing any vacuum leaks, ensuring proper wiring connections, and clearing the trouble code with a diagnostic tool.
7. Is it safe to continue driving if the P0505 code on my 1999 Honda Civic disappears on its own?
Even if the code disappears on its own, it's essential to investigate the underlying issue to prevent potential future problems with the idle control system.
8. How do I reset the P0505 code on my 1999 Honda Civic?
The code can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes. However, it's crucial to address the root cause of the issue to prevent the code from reappearing.
9. Will a P0505 code on my 1999 Honda Civic affect fuel efficiency?
Yes, a P0505 code can impact fuel efficiency due to the engine running inefficiently at idle, which can lead to increased fuel consumption.
10. Can a DIY enthusiast fix a P0505 code on a 1999 Honda Civic?
Depending on their skill level, a DIY enthusiast may be able to address the P0505 code by cleaning or replacing the Idle Air Control (IAC) valve and checking for vacuum leaks. However, more complex issues may require professional assistance.
Discuss the causes and fixes for P0505 1999 Honda Civic OBDII Code
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Replaced the part, but engine light keeps coming back with the same code. Any suggestion?
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What part exactly did you replaced? the Idle Air Control Valve (IACV) valve? any other symptoms or codes?
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I replaced the IACV, symptoms when the light is on, car doesn't shift smoothly "Automatic", feels like the car is in lower gear on high speed. This happened when I activate the cruise control at 50 + mph. When the ligh is off "reset from the battery" car runs normal.
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The IACV valve shouldn't cause a transmission problems.I suggest getting your vehicle check by a transmission shop.
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