EGR Flow Insufficient (Dual EGR)
The MAXXFORCE-P0401-13 (MaxxForce) diesel fault code means: EGR Flow Insufficient (Dual EGR). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- advanced
- Estimated cost
- $800-$5,500
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Common Symptoms
- CEL
- Derate
- Rough idle
Probable Causes (Ranked by Likelihood)
- Dual EGR system carbon Very Likely
- EGR cooler restriction Likely
Step-by-Step Diagnostic Procedure
Remove both EGR valves and clean.
Pressure-test coolers.
Inspect intake horn.
Frequently Asked Questions
What is P0401 on a MaxxForce 13 (12.4L)?
P0401 on a MaxxForce 13 (12.4L) (2008-2014) indicates: EGR Flow Insufficient (Dual EGR). 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?
Only drive short distances to reach a repair facility. Continued operation may cause further damage or progressive derate.
How much does it cost to fix MaxxForce P0401?
Repair cost is typically $800-$5,500 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.