P0510Generic code

P0510 Code: Closed Throttle Position Switch Malfunction

The P0510 code means the computer does not correctly detect when the throttle is closed. That affects idle control and the fuel cutoff on deceleration. It is usually a dirty throttle, a bad switch or a missing relearn after a cleaning.

Severity
Medium
Can I keep driving?
Yes, no immediate risk
Estimated cost
$0 to $350
Difficulty
Medium
System
Idle and Speed Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0510 code means

On some vehicles with a throttle cable, a switch or contact tells the computer that the throttle is closed. That is how it knows when to control idle or cut off fuel injection while you coast. On electronic throttles, the code can point to a problem with the learned closed position.

If the computer does not recognize a closed throttle, the idle can end up high or unsteady. The P0510 code is how it reports that.

On electronic throttles, the code often shows up after the throttle body was cleaned or replaced without running the closed-position relearn afterward. The computer keeps the old value and does not recognize the new resting position.

P0510 code symptoms

  • High or unsteady idle.
  • Jerking or surging when you slow down.
  • Check engine light on.

Likely causes of the P0510 code

  1. Switch out of adjustment or failed. It does not report the idle position.
  2. Dirty throttle that does not fully close. Carbon keeps it from reaching the stop.
  3. Position relearn not done after the throttle body was replaced or cleaned.
  4. Connector or wiring that is damaged or corroded.

How to diagnose the P0510 code step by step

  1. Look at the switch status on the scan tool with your foot off the accelerator.
  2. Clean the throttle body.
  3. Perform the relearn.

How to fix the P0510 code

  • Clean and adjust.
  • Replace the switch or the throttle body.
  • Perform the relearn.

Technical reference data

  • With the throttle closed, the switch must report the idle position.
  • These values are a general guide: check the manufacturer data for your vehicle.

Brand-specific notes

If the P0510 code appeared right after a throttle body cleaning, the relearn is the first thing to try.

P0510 on Nissan

Common on older Nissan models.

P0510 on Toyota

Common on older Toyota models.

Frequently asked questions about P0510

What does the P0510 code mean?
It is a generic OBD2 code that means the computer does not correctly detect when the throttle is closed. That affects idle control and fuel cutoff on deceleration.
Can I drive with a P0510 code?
Yes. The vehicle drives, but the idle may be high or unsteady until the fault is fixed.
What happens if I do not fix it?
You get an irregular idle and higher fuel use. The check engine light also stays on.
Can the switch be adjusted?
On older vehicles, yes. Newer electronic throttles have no switch to adjust, and they use a relearn procedure instead.
How much does it cost to fix P0510?
Between $0 and $350. Cleaning the throttle body and running a relearn may cost almost nothing, while a new throttle body with labor is at the high end.
Will a P0510 code clear itself?
It can if the throttle was only dirty and the problem was temporary, but a switch that has failed will keep setting the code. After a cleaning, clear the code and run the relearn to see if it stays away.
What is the most common cause of P0510?
A throttle that does not fully close because of carbon, or a relearn that was skipped after a cleaning or a replacement. A failed switch is the next most likely cause.

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