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Fault-code lookup

DAF fault code P0404: likely components, OEM numbers and symptoms.

EGR position or range/performance issue. This page groups every component report connected with P0404, so a mechanic can move from the error code to the relevant OEM numbers, defect symptoms and fitment checks.

A fault code alone is not a parts order. Confirm with live data, VIN, installed OEM number, connector and part photos before quoting or fitting.

Likely components

Component families linked with P0404.

The same code can appear with different root causes. Use the OEM number and symptom pattern to choose the right branch.

EGR valve Diagnostic information only

2339622 · MX-13 Euro 6 EGR valve

DAF / PACCAR

Main MX-13 Euro 6 EGR valve interchange group. It combines repeated reports for 2339622 and linked replacements where symptoms are soot blocking, position errors, failed regens and derate.

Top symptoms
  • Power derate or limp mode
  • EGR valve stuck open or stuck closed in diagnostic software
  • Rough idle, hunting or surging at cruise
OEM numbers
2339622 1953573 1954014 1960473 2021931 2052205 2104971 2123990
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Defect symptoms

Symptoms reported with P0404

Power derate or limp mode
EGR valve stuck open or stuck closed in diagnostic software
Rough idle, hunting or surging at cruise
Black smoke when pulling away or backing under a trailer
Failed regeneration and high DPF differential pressure
Coolant loss with no visible external leak
AdBlue or NOx after-cat secondary faults from incorrect EGR rate
Power loss under load
Black smoke and EGR estimated rate too high
Aborted DPF regeneration
EGR position implausible or sweep failure
DPF differential pressure high after repeated short routes
OEM numbers

OEM references to check

Use these links when the workshop note only contains an OE number instead of the exact part family.

2339622 1953573 1954014 1960473 2021931 2052205 2104971 2123990 2128145 2128861 2162359 2162360 2256370 2412200 2418868 2243011 2339640 2381128 2318904 7.08797.40 2256370PE 2339622PE 2162359R 2256370R 2339622RN 1921876 2459944 2021931R 2021931RN 2104971R 2104971RN 2162359RN 2162360RN 2256370RN 1953573PE 1896001 1952321 1954013 1960471 2021932 2104972 2128862
Why it happens

Likely root causes behind P0404

  • Carbon and soot cake the EGR valve plate, shaft and valve seat.
  • Condensation and oil mist form acidic sludge after the EGR cooler.
  • Motor gearbox wears from continuous modulation and high resistance.
  • Coolant leakage through the cooler or valve interface corrodes electronics and accelerates sludge build-up.
  • Position sensor drift causes commanded-versus-actual mismatch.
  • Soot caking on valve seat and butterfly plate.
  • Diaphragm or seal hardening after heat cycles.
  • Actuator motor fails prematurely when the valve is stiff from deposits.
Fitment

Trucks and engines that report P0404

Model Engine Years
XF 106 MX-13 Euro 6 12.9L 2013-2023
CF 85 MX-13 Euro 6 2013-2021
CF 430 MX-13 Euro 6 2017-2023
CF 480 MX-13 Euro 6 2017-2023
CF 530 MX-13 Euro 6 2017-2023
XG MX-13 Euro 6 2021-2023
XF 106 MX-11 Euro 6 2013-2022
CF 85 MX-11 Euro 6 2013-2021
CF 430 MX-11 Euro 6 2017-2021
CF 85 MX-11 Euro 6 2013-2022
XF MX-11 Euro 6 2013-2022
XF 106 MX-13 Euro 6 2013-2023
DAF XF / CF Earlier EGR-equipped engines 2001-2013
XF 106 MX-11 Euro 6 2013-2021

Need help identifying this component?

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Diagnostic index entries are not a promise that TruckValves services every listed component.