DTC Troubleshooting

DTC Troubleshooting: P0A1B (84)

DTC P0A1B (84):

Motor Control Module (MCM) Internal Circuit Malfunction

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 the DTC cannot be cleared, do the troubleshooting for DTC U1204 (55).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0), and wait 1 minute.

4. Turn the ignition switch to ON (II).

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

Is DTC P0A1B (84) indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the system is OK at this time.�

6. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.

7. Turn the ignition switch to LOCK (0), and wait 1 minute.

8. Turn the ignition switch to ON (II).

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

Is DTC P0A1B (84) indicated?

YES -

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

NO -

Go to step 10.

10. Monitor the OBD STATUS for DTC P0A1B (84) in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -

If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 9, go to the indicated DTC's troubleshooting.�

NO -

- If the screen indicates FAILED: If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1.
- If the screen indicates NOT COMPLETED: Keep the ignition switch ON (II) until a result comes on.