DTC P1107: BARO Sensor Circuit Low Voltage DTC P1108: BARO Sensor Circuit High Voltage Reset the ECM/PCM (see page 11-312). Turn the ignition switch ON (II). Is DTC P1107 or P1108 indicated? YES - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. NO - Intermittent failure, system is OK at this time.