Exhaust Gas Recirculation Control Circuit Range/Performance
The MAXXFORCE-P0404-11 (MaxxForce) diesel fault code means: Exhaust Gas Recirculation Control Circuit Range/Performance. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- advanced
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What Are the Symptoms of MAXXFORCE-P0404-11?
- Check Engine light
- Possible reduced power
What Causes MAXXFORCE-P0404-11? (Most Likely First)
- EGR valve sticking from soot build-up High
- EGR position sensor fault Medium
- Actuator wearing out or high resistance in the circuit Medium
Can I Still Drive with MAXXFORCE-P0404-11?
Short distances only. MAXXFORCE-P0404-11 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P0404 mean on a MaxxForce?
P0404 means Exhaust Gas Recirculation Control Circuit Range/Performance. The EGR valve is not reaching the position the control module commands.
Is P0404 a MaxxForce-specific code?
No. P0404 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions Navistar uses to set it on its diesels are in Navistar service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose MAXXFORCE-P0404-11?
Compare commanded and actual EGR position on a scan tool through the valve's range.
Inspect and clean the valve if soot is restricting it.
Check the circuit for high resistance.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- California Code of Regulations, Title 13 section 1971.1 (Heavy-Duty OBD)malfunction criteria, section (e)
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