DTC P0401 — EGR Flow Insufficient Detected
P0401 indicates: EGR Flow Insufficient Detected.
Diagnostic summary
P0401
What it means
EGR Flow Insufficient Detected
Can you drive?
⚠️ Drive with caution
Urgency
Medium 5/10
Typical price
$80 – $400
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Updated Aug 28, 2026 Seen on Powertrain
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ℹ️ What does it mean?
EGR Flow Insufficient Detected
🔍 Symptoms
- • Check Engine Light on
- • Reduced engine performance
- • Increased fuel consumption
- • Unusual engine behavior
⚠️ Possible Causes
- ⚠ Clogged EGR valve
- ⚠ Carbon buildup in EGR passages
- ⚠ Faulty EGR vacuum solenoid
- ⚠ DPFE sensor fault
🚗 Can I drive with this code?
Drive with caution
Drive with caution. Schedule a repair soon.
🔧 How to Diagnose
- 1 Read DTCs with OBD-II scanner
- 2 Check freeze frame data
- 3 Inspect related components
- 4 Clear codes and test drive
🛠️ How to Fix
- 1 Clean EGR valve
- 2 Clean EGR passages
- 3 Replace vacuum solenoid
- 4 Replace DPFE sensor
💰 Estimated Repair Cost
Repair cost by car / region
Early rough estimate. Accuracy improves as more real repair stories are added.
DIY / parts$28 – $260
Mechanic / labor$36 – $300
Repair range$80 – $400
❓ FAQ
What does P0401 mean?
EGR Flow Insufficient Detected
How serious is P0401?
Severity: medium. Drive with caution. Schedule a repair soon.
How much does it cost to fix P0401?
Estimated repair cost: $80–$400 depending on vehicle and region.
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