How many fault codes does the PACCAR MX-11 have?

The PACCAR MX-11 has 3 documented fault codes in our database, covering J1939 protocols.

What diagnostic protocols does the PACCAR MX-11 use?

The PACCAR MX-11 uses the J1939 diagnostic protocol(s).

Can I drive with an active fault code on my PACCAR MX-11?

It depends on severity. STOP ENGINE codes require immediate shutdown. CHECK AT NEXT STOP codes allow driving to a nearby service facility. CHECK SOON codes permit normal operation but schedule service promptly.

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PACCAR MX-11 Fault Codes

Complete diagnostic trouble code reference for the PACCAR MX-11 heavy-duty diesel engine. 3 fault codes • Protocols: J1939

SPN 524265 FMI 7

EGR Valve Mechanical Failure

Component: EGR Valve / EGR Cooler / Actuator Motor • J1939 SPN:524265 FMI:7

🟡 CHECK AT NEXT STOP

SPN 94 FMI 1

Fuel Delivery Pressure Low

Component: Fuel Supply Pump / Fuel Filters / Fuel Lines / Fuel Pressure Regulator • J1939 SPN:94 FMI:1

🟠 CHECK SOON

SPN 4335 FMI 15

SCR Outlet NOx Sensor High Reading

Component: SCR Outlet NOx Sensor / SCR Catalyst / DEF Dosing System • J1939 SPN:4335 FMI:15

🟠 CHECK SOON

Engine Series Coverage: PACCAR MX-11 engine specifications and fault codes sourced from SAE J1939/J1587 public standards and OEM technical service documentation. Last reviewed 2026-08-04T02:30:39Z.