P0507 Code on Nissan Altima: Idle Control System RPM Higher Than Expected
Quick Answer: What is P0455?
On a Nissan Altima, the P0507 code triggers when the engine is idling at a higher RPM than the computer's target. This commonly happens after cleaning the throttle body or due to a vacuum leak. Most Nissans require a specific "Idle Air Volume Relearn" procedure to reset the idle speed to factory specifications.
Severity: Low to Moderate. While your Altima is safe to drive, a high idle will put extra strain on your brakes and transmission when stopping. It also results in poor fuel economy and can cause the engine to run hotter than normal.
1. Common Symptoms in a Nissan Altima
You will notice the car behaving differently as soon as you come to a stop:
- High Idle Speed: The engine stays at 1,000 or 1,200 RPM when it should be at 700 RPM.
- Surging Idle: The RPMs "bounce" up and down while parked.
- Harsh Shifting: When shifting from Park to Drive, the car "jerks" because the engine is spinning too fast.
- Check Engine Light: Illuminates solidly on the dash.
[ESPACIO PARA ANUNCIO ADSENSE - IN-ARTICLE]
2. Most Likely Causes (Ranked by Probability)
Nissan's electronic throttle system is extremely sensitive to changes:
- Manual Movement of Throttle Plate (60% of cases): If you cleaned the throttle body and moved the butterfly valve with your hands, the computer lost its "zero" position.
- Vacuum Leaks (20% of cases): A cracked PCV hose or intake gasket letting extra air into the engine, forcing the RPMs up.
- Dirty Throttle Body (15% of cases): Carbon buildup preventing the valve from closing to its proper idle position.
- Faulty Electric Throttle Control Actuator (5% of cases): The motor inside the throttle body has failed.
3. Step-by-Step Fix: The Nissan "Pedal Dance"
Before paying a dealer for a diagnostic, try the Idle Air Volume Relearn procedure. You will need a stopwatch and precision timing:
- Start engine and warm it up to normal operating temperature. Turn off all electronics (AC, Radio, Lights).
- Turn ignition OFF and wait at least 10 seconds.
- Turn ignition ON (don't start) and wait 3 seconds.
- Immediately depress and release the accelerator pedal 5 times within 5 seconds.
- Wait 7 seconds. Then fully depress the accelerator and hold it for approx. 20 seconds until the Check Engine Light stops blinking and stays ON.
- Release the pedal and start the engine within 3 seconds. Let it idle.
4. Estimated Repair Costs
If the manual relearn doesn't work, you may need professional tools or parts:
| Repair Type | Estimated Cost (USD) |
|---|---|
| Manual Idle Relearn (DIY) | $0.00 (Free) |
| Throttle Body Cleaning Kit | $10 - $15 |
| Professional Relearn (Scan Tool) | $80 - $150 (Labor) |
| Replace Electronic Throttle Body | $300 - $600+ |