P0405 — Exhaust Gas Recirculation Circuit Range/Performance
Can drive — fix at your convenience.
What P0405 means
This code means the EGR valve's actual position or flow doesn't match what the engine computer commanded, so it's out of its expected range or responding too slowly. It's frequently caused by carbon buildup sticking the valve, a faulty position sensor, or a worn EGR valve. Cleaning the valve and passages often fixes it, though sometimes the EGR valve needs replacing.
Common symptoms
- Check engine light is on
- Rough or fluctuating idle
- Hesitation or stumble under acceleration
- Reduced fuel economy
- Failed emissions or smog test
Common causes
- Carbon buildup sticking the EGR valve
- Faulty EGR position sensor
- Worn or sluggish EGR valve
- Clogged EGR passages
- Wiring or connector fault at the EGR valve
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0405 code?
Yes, you can usually drive normally for a while since it's an emissions issue. You may feel a rough idle or slight hesitation. Have it repaired within a week or two to prevent carbon buildup and an emissions failure.
How much does it cost to fix a P0405 code?
Repairs generally run $150 to $500. Cleaning the EGR valve and passages is the budget option, while replacing the EGR valve with labor is at the higher end of that range.
Is a P0405 code serious?
It's low severity. The engine usually runs fine, but the EGR system isn't performing correctly, which hurts emissions and economy. It's worth fixing soon but isn't an emergency.
What does range/performance mean in P0405?
It means the EGR valve is opening or closing, but not by the right amount or quickly enough to match the computer's command. This is often due to carbon sticking the valve or a position sensor reading incorrectly.