PACCAR (Kenworth & Peterbilt)
PACCAR fault code
SPN 3480 / FMI 17
PACCAR Fault Code P3837: Intake Module Fuel Pressure – Data Valid But Too Low, Least Severe
P3837 on PACCAR (Kenworth & Peterbilt) engines means: Intake Module Fuel Pressure – Data Valid But Too Low, Least Severe. The failure mode (FMI 17) is “data valid but below normal range (least severe)”.
Code details
- Manufacturer
- PACCAR (Kenworth & Peterbilt)
- Applies to
- PACCAR MX-13 (2017–2020)
- Fault code
- P3837
- J1939 SPN
- 3480
- 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.
Get this code diagnosed
Send one request and nearby diesel shops and mobile mechanics can quote the repair.
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Related fault codes
- PACCAR Fault Code P3838 — Intake Module Fuel Pressure – Data Erratic, Intermittent or Incorrect, Not Changing During Operation on ECU (D442) Pin (7)
- PACCAR Fault Code P3839 — Intake Module Fuel Pressure – Voltage Too High or Short Circuit to Supply on ECU (D442) Pin (7)
- PACCAR Fault Code P3840 — Intake Module Fuel Pressure – Voltage Too Low or Short Circuit to Ground on ECU (D442) Pin (7)
- PACCAR Fault Code P3838 — Intake Module Fuel Pressure – Data Erratic, Intermittent, or Incorrect, Not Changing During Operation on ECU (D374) Pin (A72)
- PACCAR Fault Code P3839 — Intake Module Fuel Pressure – Voltage Too High or Short Circuit to Supply on ECU (D374) Pin (A72)
- PACCAR Fault Code P3840 — Intake Module Fuel Pressure – Voltage Too Low or Short Circuit to Ground on ECU (D374) Pin (A72)
- International Fault Code SPN 3480 FMI 3 — AFTFP1 Signal – Out of Range HIGH
- International Fault Code SPN 3480 FMI 4 — AFTFP1 Signal – Out of Range LOW
Source: PACCAR MX-13 2017–2020 fault code list (Diesel Laptops). See also OBD-II codes.