DTC Troubleshooting: P1549
DTC P1549: Charging System High Voltage
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If a high voltage battery (24 V, etc.) is connected to the vehicle, this DTC can be stored.

DTC Description
Confirmed DTC
Pending DTC
P1549 Charging System High Voltage
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Check under these conditions:
A/C off
Headlights off
Rear window defogger off

?5.
Hold the engine speed at 3,000 rpm without load (in neutral) for 1 minute.

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P1549 Charging System High Voltage
    

Is DTC P1549 indicated?

     
YES
     
     
     
The failure is duplicated. Replace the alternator.?
     
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. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?