This document is a code 222 DTCs troubleshooting manual for the barometric pressure sensor circuit on CM2150 engines. It explains the voltage-below-normal or short-to-low-source fault, the amber lamp action, the engine power derate effect, and the guided diagnostic steps used with INSITE™.
Official code 222 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB with CM2150; ISC and ISL with CM2150; ISB6.7 CM2150 (2007-09) group information |
| System/Group | DTCs; Barometric Pressure Sensor Circuit |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the barometric pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file covers Cummins ISB with CM2150, ISC with CM2150, and ISL with CM2150 applications where Fault Code: 222, PID: P108, SPN: 108, FMI: 4/4 is used for the barometric pressure sensor circuit. The extract also identifies ISB6.7 CM2150 (2007-09) under the DTC group. Component location information states that the barometric pressure sensor is mounted on the main branch of the engine harness near the ECM. For manufacturer information, visit Cummins official website.
Who needs this code 222 DTCs manual
Workshop technicians need this code 222 DTCs manual when diagnosing low signal voltage at the ambient air pressure circuit, especially when checking sensor supply voltage, return circuits, connector pins, and ECM response. Fleet owners and shop managers can also use it to confirm the repair path before replacing harness parts or requesting ECM replacement authorization.
The diagnostic procedure starts by checking for sensor supply fault codes, including Fault Code 352, and then confirming whether Fault Code 222 is active or inactive. It includes connector inspection criteria such as loose connectors, corroded pins, bent or broken pins, pushed back pins, moisture, damaged seals, wire insulation damage, and broken locking tabs. The voltage checks shown in the extract use a 4.75 to 5.25 VDC specification for the sensor supply and return circuit.
Later guided steps use jumper-wire tests between the barometric pressure +5 volt SUPPLY pin and the SIGNAL pin at the sensor connector or ECM engine connector. The expected circuit response can include Fault Code 221 active and Fault Code 222 inactive. Repair outcomes in the file include cleaning connectors, repairing or replacing the engine wiring harness, or calling for authorization to replace the ECM under Procedure 019-031.
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