P0401 is a generic OBD-II trouble code that means: Exhaust Gas Recirculation (EGR) System – Insufficient Flow Detected. You can drive carefully for a short time, but have it fixed promptly. Ignoring it can reduce performance and damage other parts.
What does P0401 mean?
P0401 is a generic OBD-II trouble code that means: Exhaust Gas Recirculation (EGR) System – Insufficient Flow Detected. The engine control module (ECM) stores this code when it detects a fault related to: Exhaust Gas Recirculation (EGR) System.
Can I still drive?
You can drive carefully for a short time, but have it fixed promptly. Ignoring it can reduce performance and damage other parts.
Symptoms
- Check engine light is on
- Rough or unstable idle
- Hesitation or jerking when accelerating
- Loss of power
- Failed emissions test
Common causes
- Carbon build-up in the EGR valve or passages
- Damaged wiring or a loose/corroded connector
- Faulty sensor or component
How to fix it
- Read all stored codes and freeze-frame data with an OBD-II scanner
- Clean the EGR valve and passages
- Inspect the wiring and connectors for damage, corrosion or looseness
- Replace the faulty component with a quality part
- Clear the code and road-test the car to confirm the repair
Frequently asked questions
What does code P0401 mean?
P0401 is a generic OBD-II trouble code that means: Exhaust Gas Recirculation (EGR) System – Insufficient Flow Detected. The engine control module (ECM) stores this code when it detects a fault related to: Exhaust Gas Recirculation (EGR) System.
What causes code P0401?
The most common causes are: Carbon build-up in the EGR valve or passages; Damaged wiring or a loose/corroded connector; Faulty sensor or component.
How do I fix code P0401?
Start with these steps: Read all stored codes and freeze-frame data with an OBD-II scanner; Clean the EGR valve and passages; Inspect the wiring and connectors for damage, corrosion or looseness; Replace the faulty component with a quality part.
Is it safe to drive with code P0401?
Severity: Medium. You can drive carefully for a short time, but have it fixed promptly. Ignoring it can reduce performance and damage other parts.