P0510 Code: Closed Throttle Position Switch Fault
🟢 Low severity · drivable
Drivable, but the engine may idle rough or stall at stops until the switch is fixed.
What P0510 means
The closed throttle position switch, which tells the engine computer when the gas pedal is fully released, is not sending the expected signal. The computer uses this switch to manage idle speed when you take your foot off the pedal. A faulty switch can leave the engine idling poorly or stalling at stops.
Symptoms
- Check engine light is on
- Rough or unstable idle
- Stalling when coming to a stop
- Hesitation when pressing the gas pedal
Common causes
- most common: Faulty closed throttle position switch
- common: Damaged or corroded switch wiring
- common: Loose or misadjusted throttle linkage
- less common: Carbon buildup on the throttle body
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the closed throttle position switch | Yes | $40–150 |
| Clean the throttle body and throttle linkage | Yes | $20–100 |
| Repair damaged switch wiring | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0510 code?
Yes, but the engine may idle rough or stall at stoplights. It is safe to drive to a shop, though.
What does the closed throttle position switch do?
It tells the computer that your foot is off the gas, which is how the computer knows to control the idle speed.
How much does it cost to fix a P0510?
A new switch runs about $40–$150. Throttle cleaning or wiring repairs add $20–$200.
Related codes
P0506
P0506 Code: Idle Air Control System RPM Lower Than Expected
P0507P0507 Code: Idle Air Control System RPM Higher Than Expected
P0121P0121 Code: Throttle Position Sensor/Switch Circuit Range/Performance
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.