P0505 2006 Toyota Highlander Code - Idle Air Control System
Quick Answer
The idle speed is controlled by the Electronic Throttle Control System (ETCS). Common causes include Dirty Throttle Body, Faulty Electronic Throttle Control System (ETCS) (Throttle body), Electronic Throttle Control System harness is open or shorted. 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 2006 Toyota Highlander indicates Idle Air Control System.
- Common causes
- Common causes include Dirty Throttle Body, Faulty Electronic Throttle Control System (ETCS) (Throttle body), Electronic Throttle Control System harness is open or shorted.
- 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 2006 Toyota Highlander Description
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM concludes that the idle speed control ECM function is malfunctioning and set the Diagnostic Trouble Code (DTC) if:
1. The actual idle RPM varies more than the specified amount five times or more during a drive cycle
2. The learning value of the idle speed control remains at the maximum or minimum five times or more during a drive cycle.
Example: If the actual idle RPM varies from the target idle RPM by more than 200* rpm five times during a drive cycle, the ECM will turn on the MIL and will set a DTC.
What are the Possible Causes of the DTC P0505 2006 Toyota Highlander?
- Dirty Throttle Body
- Faulty Electronic Throttle Control System (ETCS) (Throttle body)
- Electronic Throttle Control System harness is open or shorted
- Electronic Throttle Control System circuit poor electrical connection
- Air Induction System (Intake leak)
- PCV hose connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0505 2006 Toyota Highlander?
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 2006 Toyota Highlander 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 2006 Toyota Highlander code?
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Frequently Asked Questions about P0505 2006 Toyota Highlander Code
1. What does the OBDII code P0505 mean on a 2006 Toyota Highlander?
P0505 indicates a malfunction in the Idle Air Control (IAC) System, which regulates the engine's idle speed.
2. What are the common symptoms of code P0505 in a 2006 Toyota Highlander?
Symptoms may include rough idling, stalling, fluctuating idle speed, or the engine failing to maintain idle.
3. What causes the P0505 code in a 2006 Toyota Highlander?
Common causes include a dirty or faulty idle air control valve, vacuum leaks, a malfunctioning throttle body, or wiring issues.
4. How can I fix the P0505 code on my 2006 Toyota Highlander?
Start by cleaning the idle air control valve and throttle body. If the issue persists, inspect for vacuum leaks or replace the IAC valve if necessary.
5. Can a vacuum leak trigger the P0505 code?
Yes, vacuum leaks can disrupt the idle air control system, leading to the P0505 code.
6. Is it safe to drive with the P0505 code on a 2006 Toyota Highlander?
Driving is possible but not recommended, as unstable idle speed or stalling could pose safety risks.
7. How do I diagnose the P0505 code on my Toyota Highlander?
Use an OBDII scanner to confirm the code, then inspect the IAC valve, throttle body, and vacuum lines for damage or buildup.
8. How much does it cost to repair the P0505 code on a 2006 Toyota Highlander?
Repair costs vary but can range from $100 to $400, depending on whether cleaning or part replacement is needed.
9. Can a dirty throttle body cause the P0505 code?
Yes, a dirty throttle body can affect airflow and disrupt the IAC system, triggering the code.
10. Does the P0505 code always mean the idle air control valve is bad?
No, it could also be caused by other issues like vacuum leaks, wiring problems, or a dirty throttle body.
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