Engine Controls - Limp Home Mode/DTC P0600 Set

Bulletin No: 01-051/10

Last Issued: 10/15/10

SUBJECT: MIL ILLUMINATION - DTC P0600





BULLETIN NOTE





APPLICABLE MODEL(S)/VINS

DESCRIPTION

If the engine is started with a weak battery, some vehicles will store a DTC P0600 in memory and may go into "limp home" mode. In some cases other DTCs such as P2101, P0140, or P0571 may also be stored.

^ P0600: Serial communication link

NOTE:
^ "Limp home" mode is a driving mode in which the throttle valve opening amount is fixed in order to avoid a dangerous driving situation due to a PCM failure.

^ DTC P0600 cannot be erased unless the vehicle is out of "limp home" mode.

When battery voltage becomes too low, both PCM (main and sub) computers stop operating. When battery voltage returns to normal, the main computer restores itself, however, the sub computer does not. As a result, the main computer diagnoses the sub computer malfunction and allows a DTC P0600 to be stored in memory.

Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE

Restore PCM sub computer according to the following:

1. Verify customer concern.

2. Record customer's pre-set radio stations.

3. Disconnect negative battery cable.

4. Depress brake pedal for at least one (1) minute.

5. Diagnose battery to determine if battery needs to be replaced. If not, recharge battery.

6. Reconnect negative battery cable.

7. Clear DTC from PCM memory using M-MDS.

8. If DTC is still stored, troubleshoot it according to Workshop Manual.

9. Re-enter customer's pre-set radio stations.

10. Perform "Power Window Initialization" procedure to restore power window functions.

11. Verify repair.