P0510 — Idle Control System RPM Higher Than Expected
Drive with caution — fix soon.
What P0510 means
This code means the idle control system is letting the engine idle faster than the computer wants it to. It's commonly caused by a vacuum leak letting in extra air, a stuck or dirty throttle, or a faulty idle air control valve. Finding and sealing vacuum leaks or cleaning the throttle body usually brings the idle back to normal.
Common symptoms
- Check engine light is on
- Idle speed is higher than normal
- Engine RPM stays elevated at stops
- Car creeps forward more than usual at stops
- Slightly worse fuel economy
Common causes
- Vacuum leak letting in unmetered air
- Dirty or sticking throttle body
- Faulty idle air control valve
- Stuck or misadjusted throttle plate
- Wiring or connector fault in the idle control circuit
Typical repair cost
$120 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0510 code?
Usually yes. A high idle isn't an immediate danger, but the car may creep at stops and waste fuel, so it's best to get it checked before it gets worse.
How much does it cost to fix a P0510?
Repairs typically range from $120 to $400. Cleaning the throttle body is cheap, while sealing vacuum leaks or replacing the idle air control valve costs more.
Is a P0510 code serious?
It's a moderate issue. It won't usually leave you stranded, but a high idle wastes fuel and can make the car harder to control at low speeds, so it's worth addressing soon.
Why is my idle high with a P0510?
The most common reason is a vacuum leak letting in extra air the computer didn't account for, which raises the idle. A dirty throttle body or faulty idle control valve can do the same.