DTC Troubleshooting

DTC Troubleshooting: P2227

DTC P2227:

BARO Sensor Circuit Range/Performance Problem

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If DTC P0107, P0108, P1128, and/or P1129 are stored at the same time as DTC P2227, troubleshoot those DTCs first, then recheck for DTC P2227.

1. Turn the ignition switch to ON (II), and wait 2 seconds.

2. Check the BARO SENSOR in the DATA LIST with the HDS.

Is about 101 kPa (29.9 inHg, 760 mmHg), or about 2.9 V at sea level indicated?

YES -

Go to step 3.

NO -

Go to step 7.

3. Clear the DTC with the HDS.

4. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

5. Test-drive under these conditions:

- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in 4th
- REL TP SENSOR between 12 and 20 degrees for at least 2 seconds

6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES -

Go to step 7.

NO -

If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 and recheck.

7. Check the intake air system for clogging or restrictions (foreign material, dirty air cleaner element, etc.).

Is the intake air system clogged or restricted?

YES -

Remove the clog or restriction, then go to step 9.

NO -

Go to step 8.

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

9. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

10. Test-drive under these conditions:

- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in 4th
- REL TP SENSOR between 12 and 20 degrees for at least 2 seconds

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

Is DTC P2227 indicated?

YES -

Check for poor connections or loose terminals at the ECM. If the ECM was updated, substitute a known-good ECM, then go to step 9. If the ECM was substituted, go to step 1.

NO -

Go to step 12.

12. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -

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 were indicated in step 11, go to the indicated DTC's troubleshooting.�

NO -

If the screen indicates FAILED, check for poor connections or loose terminals at the ECM. If the ECM was updated, substitute a known-good ECM, then go to step 9. If the ECM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 9.