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PACCAR Diesel Engine Fault Codes

Browse 14 diagnostic trouble codes across 2 engine series. Protocols: J1587, J1939.

🔴 3 STOP ENGINE 🟡 6 Check Next Stop 🟠 5 Check Soon

PACCAR Inc., the parent company of Kenworth and Peterbilt, produces the MX-13 engine in collaboration with DAF Trucks. The MX-13 uses a high-pressure common rail fuel system operating at pressures exceeding 2,500 bar — significantly higher than traditional diesel systems. This makes fuel rail pressure fault codes (SPN 1077) particularly critical. PACCAR engines use both standard J1939 codes and proprietary PACCAR codes accessible through DAVIE diagnostic software.

MX-11 Engine Series — 3 fault codes

SPN 524265 FMI 7
EGR Valve Mechanical Failure
🟡 CHECK AT NEXT STOP
Component: EGR Valve / EGR Cooler / Actuator Motor • J1939
SPN 94 FMI 1
Fuel Delivery Pressure Low
🟠 CHECK SOON
Component: Fuel Supply Pump / Fuel Filters / Fuel Lines / Fuel Pressure Regulator • J1939
SPN 4335 FMI 15
SCR Outlet NOx Sensor High Reading
🟠 CHECK SOON
Component: SCR Outlet NOx Sensor / SCR Catalyst / DEF Dosing System • J1939

MX-13 Engine Series — 11 fault codes

SPN 1077 FMI 14
High Pressure Fuel Rail Pressure
🔴 STOP ENGINE
Component: High Pressure Fuel Pump / Rail • J1939
SPN 1347 FMI 7
Fuel Pump Pressurizing Assembly (HPP)
🔴 STOP ENGINE
Component: High Pressure Fuel Pump (HPP) • J1939
SPN 647 FMI 4
Engine Speed Sensor
🟡 CHECK AT NEXT STOP
Component: Crankshaft Position Sensor (CKP) • J1939
SPN 91 FMI 16
Accelerator Pedal Position
🟡 CHECK AT NEXT STOP
Component: Accelerator Pedal Assembly (APP) • J1939
MID 130 PID 52 FMI 5
Transmission Oil Temperature Sensor
🟡 CHECK AT NEXT STOP
Component: Transmission Oil Temp Sensor / Harness • J1587
SPN 411 FMI 16
Exhaust Gas Recirculation (EGR) Differential Pressure
🟠 CHECK SOON
Component: EGR Differential Pressure Sensor / EGR System • J1939
MID 128 PID 105 FMI 10
Intake Manifold Temperature
🟠 CHECK SOON
Component: Intake Manifold Temperature Sensor • J1587
SPN 524266 FMI 7
VGT Actuator Mechanical Failure
🟡 CHECK AT NEXT STOP
Component: VGT Actuator / Variable Geometry Turbocharger • J1939
SPN 3361 FMI 7
DOC Efficiency Low
🟠 CHECK SOON
Component: Diesel Oxidation Catalyst / Aftertreatment System • J1939
SPN 4364 FMI 18
SCR Inducement System Active
🔴 STOP ENGINE
Component: SCR System / Aftertreatment Control Module / DEF System • J1939
SPN 3364 FMI 2
EGR Valve Position Signal Erratic
🟡 CHECK AT NEXT STOP
Component: EGR Valve Position Sensor / EGR Valve Actuator • J1939