Cummins Fault Code 221: Ambient Air Pressure Sensor Circuit – shorted high

Code details

Manufacturer

Cummins

Applies to

Cummins QS-series electronic engines

Fault code

221

J1939 SPN

108

FMI

3 — Voltage above normal, or shorted to high source

J1587 PID / SID

P108

Engine models

QSC, QSL9, QSM11, QSX15, QSK19, QSK23, QST30

QSK45/60/78 severity level

QSK45: 2 • QSK60: 2 • QSK78: 2

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

• Cummins Fault Code 222 — Ambient Air Pressure Sensor Circuit – shorted low
• Cummins Fault Code 295 — Ambient Air Pressure Sensor Circuit - data incorrect
• PACCAR Fault Code P2226 — Internal ECU Ambient Pressure – Data Erratic, Intermittent or Incorrect, at Ignition ON
• PACCAR Fault Code P2228 — Internal ECU Ambient Pressure – Malfunction
• PACCAR Fault Code P2229 — Internal ECU Ambient Pressure – Malfunction
• International Fault Code SPN 108 FMI 2 — BARO Signal – Erratic, Intermittent or Incorrect
• International Fault Code SPN 108 FMI 3 — BARO Signal – Out of Range HIGH
• International Fault Code SPN 108 FMI 4 — BARO Signal – Out of Range LOW