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
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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.