P0401Medium urgency
Exhaust Gas Recirculation Insufficient Flow
Emission · EGR System
⚠️ Safe to drive — fix before emissions test.
What this means
The EGR system is not flowing enough exhaust back into the intake. Usually caused by a clogged EGR valve or passages.
Likely causes
- Clogged EGR valveMost common
- Blocked EGR passagesMost common
- Failed EGR solenoidCommon
Estimated repair cost
EGR valve cleaning$100 – $200
EGR valve replacement$200 – $500
EGR passage cleaning$150 – $300
🏪
Sponsored · Local Shop
Find shops near you specializing in this repair
Get quotes from certified mechanics · Free estimates
📦
Sponsored · Parts (Amazon affiliate)
Top-rated parts for this repair
Direct-fit · Same-day shipping · 4.7★ average rating
Sponsored: MyOBDCode may earn compensation when you click partner links on this page.
Frequently asked questions
What does P0401 mean?
The EGR system is not flowing enough exhaust back into the intake. Usually caused by a clogged EGR valve or passages.
Is P0401 serious?
Safe to drive — fix before emissions test.
How much does it cost to fix P0401?
Repair costs for P0401 range from $100 – $200 depending on the root cause and your vehicle.
Can I drive with P0401?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.