Skip to main content
DTC Troubleshooting: P1549

DTC P1549:
 Charging System High Voltage
NOTE:
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Start the engine.
  1. Check under these conditions:
    • A/C off
    • Headlights off
    • Rear window defogger off
  1. Hold the engine speed at 2,000 rpm (min −1 ) (A/T in P or N, M/T in neutral) for 1 minute.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1549 indicated?
YES -
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the battery terminal fuse box.■
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Start the engine.
  1. Check under these conditions:
    • A/C off
    • Headlights off
    • Rear window defogger off
  1. Hold the engine speed at 2,000 rpm (min −1 ) (A/T in P or N, M/T in neutral) for 1 minute.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1549 indicated?
YES -
Check for poor connections or loose terminals at the alternator and the battery terminal fuse box, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■