EGR Flow Insufficient
Can I Drive?
Yes, But Fix Soon
DIY Difficulty
advanced
Estimated Cost
$500-$3,500
What does MAXXFORCE-P0401-7 mean?
The MAXXFORCE-P0401-7 (MaxxForce) diesel fault code means: EGR Flow Insufficient. This is a serious severity code.
Common Symptoms
- CEL
- Rough idle
- High NOx
Probable Causes (Ranked by Likelihood)
- Plugged EGR cooler (bank 1 or 2) Very Likely
- Carboned EGR valve Likely
Step-by-Step Diagnostic Procedure
Remove and inspect both EGR coolers for soot.
Clean or replace as needed.
Frequently Asked Questions
What is P0401 on a MaxxForce 7 (6.4L)?
P0401 on a MaxxForce 7 (6.4L) (2007-2013) indicates: EGR Flow Insufficient. This is a known fault code on the MaxxForce engine family and typically points to the causes listed above.
Can I drive with P0401 on my MaxxForce?
Yes, you can generally drive with this code, but diagnose soon to prevent secondary damage.
How much does it cost to fix MaxxForce P0401?
Repair cost is typically $500-$3,500 depending on the underlying cause and shop rate. Many MaxxForce faults (especially EGR cooler, head bolt, and VGT repairs) are major expenses that drove fleet owners to repower with Cummins or retire these trucks early.