DTC Troubleshooting

DTC Troubleshooting: P1109

DTC P1109:

BARO Sensor Circuit Out of Range High

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Reset the ECM with the HDS.

2. Start the engine.

3. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1109 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

4. Update the ECM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM.

5. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1109 indicated?

YES -

If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to step 1.

NO -

If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�