PACCAR Fault Code P104C: Inlet Air Pressure in Inlet Manifold – Data Valid But Too Low

Code details

Manufacturer

PACCAR (Kenworth & Peterbilt)

Applies to

PACCAR MX-13 (2017–2020)

Fault code

P104C

J1939 SPN

102

FMI

17 — Data valid but below normal range (least severe)

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 17 tells the shop the type of failure to test for: data valid but below normal range (least severe).
• 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 P0069 — Inlet Air Pressure in Inlet Manifold – Data Erratic, Intermittent or Incorrect, at Ignition ON
• PACCAR Fault Code P0107 — Inlet Air Pressure in Inlet Manifold – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A51)
• PACCAR Fault Code P0108 — Inlet Air Pressure in Inlet Manifold – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A51)
• PACCAR Fault Code P104B — Inlet Air Pressure in Inlet Manifold – Data Valid But Too High
• PACCAR Fault Code P1409 — EGR Pressure – Data Valid But Too High
• Cummins Fault Code 122 — Intake Manifold Pressure Sensor #1 Circuit - shorted high
• Cummins Fault Code 123 — Intake Manifold Pressure Sensor #1 Circuit - shorted low
• Cummins Fault Code 124 — High Intake Manifold Pressure Left Bank