CM870 and ISX Engines – FAULT CODE 222

Barometric Pressure Sensor Circuit


Fault Code: 222
PID: P108
SPN: 108
FMI: 4/4
LAMP: Amber

Barometric Pressure Sensor Circuit – shorted low. Low signal voltage detected at barometric pressure circuit.

Engine power derate

Barometric Pressure Sensor Circuit

Circuit Description

The barometric pressure sensor is used by the electronic control module (ECM) to monitor the barometric pressure. This value is one of many inputs used by the ECM to determine the correct air/fuel ratio for proper engine operation.

Component Location

The barometric pressure sensor is mounted on the main branch of the engine harness near the ECM. Refer to Section E for a detailed component location view.

Shop Talk

The barometric pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness may cause multiple fault codes to be active. Before troubleshooting Fault Code 222, check for multiple faults.

Possible causes of this fault code include:

  • Signal circuit open or shorted to ground in the engine harness or sensor
  • Supply line open or shorted to ground.

Refer to Troubleshooting Fault Code t05-222

Last Modified:  01-Sep-2010