Diagnostic Instructions
DTC Descriptors
DTC P2226 03: Barometric Pressure (BARO) Sensor Circuit Voltage Below Threshold
DTC P2226 07: Barometric Pressure (BARO) Sensor Circuit Voltage Above Threshold
DTC P2228: Barometric Pressure (BARO) Sensor Circuit Low Voltage
DTC P2229: Barometric Pressure (BARO) Sensor Circuit High Voltage
Circuit/System Description
The BARO sensor is integrated within the engine control module (ECM). The barometric pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. The BARO sensor provides the ECM an indication of barometric pressure. The BARO sensor
provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.
Conditions for Running the DTC
The ignition is ON or the engine is operating.
Conditions for Setting the DTC
P2226 03 and P2228
• | The ECM detects that the BARO sensor voltage is less than 2.1 volts. |
• | The condition exists for greater than 0.5 seconds. |
P2226 07 and P2229
• | The ECM detects that the BARO sensor voltage is greater than 4.7 volts. |
• | The condition exists for greater than 0.5 seconds. |
Action Taken When the DTC Sets
DTCs P2226, P2228, and P2229 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2226, P2228, and P2229 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
Important: If you were sent here from P0069, proceed to Circuit System Testing.
- Start the engine, observe the DTC information with a scan tool. DTCs P2226, P2228, or P2229 should not set.
- Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
- Inspect the atmospheric vent on the ECM case for one of the following conditions:
• | Moisture in the vent inlet |
• | Debris in the vent inlet |
⇒ | If a condition exists, attempt to clean or dry the atmospheric inlet. |
- Start the engine, observe the DTC information with a scan tool. DTCs P0069, P2226, P2228, or P2229 should not set.
⇒ | If DTC P0069, P2226, P2228, or P2229 sets, replace the ECM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for engine control module replacement, setup, and programming