DTC Troubleshooting

DTC P16BB: Alternator B Terminal Circuit Low Voltage ('06-07 models)

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

1. Turn the ignition switch ON (II).
2. Clear the DTC with HDS.
3. Start the engine.
4. Check under these conditions:
- A/C on
- Temperature control at maximum cool
- Blower fan at maximum speed
- Rear window defogger on
- Headlights on high beam

5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
6. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P16BB indicated?

YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, and check the battery performance.

7. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+B line).

Are the connections and terminals OK?

YES - Go to step 8.

NO - Repair the connections or terminals, then Go to step 9.

8. Check for an open in the wire between the alternator and under-hood fuse/relay box.

Is the harness OK?

YES - Replace the alternator, then Go to step 9.

NO - Repair open in the wire between the alternator and the under-hood fuse/relay box, then Go to step 9.

9. Turn the ignition switch ON (II).
10. Reset the ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure.
12. Start the engine.
13. Check under these conditions:
- A/C on
- Temperature control at maximum cool
- Blower fan at maximum speed
- Rear window defogger on
- Headlights on high beam

14. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.

15. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P16BB indicated?

YES - Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then Go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTC are indicated, Go to the indicated DTC's troubleshooting.