PACCAR Fault Code P3942: Exhaust Gas Temperature Sensors DPF – Voltage Too High or Short Circuit to Supply

Code details

Manufacturer

PACCAR (Kenworth & Peterbilt)

Applies to

PACCAR MX-13 (2013–2016)

Fault code

P3942

J1939 SPN

5742

FMI

3 — Voltage above normal, or shorted to high source

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 3 tells the shop the type of failure to test for: voltage above normal, or shorted to high source.
• 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 P3942 — Exhaust Gas Temperature Sensors ECU – Voltage Too High or Short Circuit to Supply
• PACCAR Fault Code P3874 — PM Sensor ECU – Temperature Too High
• PACCAR Fault Code P3943 — Exhaust Gas Temperature Sensors ECU – Voltage Too Low or Short Circuit to Ground
• PACCAR Fault Code P3944 — Exhaust Gas Temperature DPF – Data Valid But Too High
• PACCAR Fault Code P3945 — CAN Communication – Timeout From DOC/DPF Temperature Sensors ECU
• PACCAR Fault Code P3987 — Exhaust Gas Temperature Sensors ECU – Internal Error
• PACCAR Fault Code P3990 — Exhaust Gas Temperature Sensors ECU Power Supply – Interrupted
• PACCAR Fault Code P3874 — CAN Communication – Message Time-out from DOC DPF Temperature Sensors ECU