DTC Troubleshooting: P2228 (13-5)

DTC P2228: BARO Sensor Circuit Low Voltage Turn the ignition switch ON (II). Check the BARO SENSOR in the DATA LIST with the HDS. Is about 2.2 V or less indicated?
YES | - | Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO | - | Intermittent failure, system is OK at this time.■