PACCAR Fault Code P104D: Exhaust Gas Pressure Before Turbine – Data Valid But Too High

Code details

Manufacturer

PACCAR (Kenworth & Peterbilt)

Applies to

PACCAR MX-13 (2017–2020)

Fault code

P104D

J1939 SPN

1209

FMI

11 — Root cause not known

Truck models in source

Kenworth T680, T880, W900, T800; Peterbilt 579, 389, 567, 367

What to do next

• Read active and inactive codes with the OEM service tool and note the occurrence count.
• FMI 11 tells the shop the type of failure to test for: root cause not known.
• Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.

Related fault codes

• PACCAR Fault Code P0471 — Exhaust Gas Pressure Before Turbine – Data Erratic, Intermittent or Incorrect, at Ignition ON
• PACCAR Fault Code P0472 — Exhaust Gas Pressure Before Turbine – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C83)
• PACCAR Fault Code P0473 — Exhaust Gas Pressure Before Turbine – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C83)
• PACCAR Fault Code P1042 — VTG Turbocharger Control – Incorrect
• PACCAR Fault Code P1057 — Exhaust Gas Pressure Before Turbine – Data Valid But Too Low
• PACCAR Fault Code P1723 — Exhaust Gas Pressure Before Turbine – Data Valid But Too Low
• PACCAR Fault Code P1724 — Exhaust Gas Pressure Before Turbine – Data Valid But Too High
• PACCAR Fault Code P1726 — Exhaust Gas Pressure Before Turbine – Response Too Slow, on Requested Pressure