What this code means

The system charging voltage is outside the expected regulation window.

Symptoms

• Battery light
• Check engine light
• Electrical accessories malfunction
• Battery drains overnight

Common causes

• Failed alternator
• Loose drive belt
• Battery terminal corrosion
• ECM-controlled charging fault

Diagnostic steps

1. Check battery voltage engine off and running
2. Inspect belt tension and condition
3. Load test alternator
4. Check battery terminals

Repair notes

Replace alternator or battery. Clean terminals. Check belt.

Other Powertrain codes on this vehicle