What this code means

The PCM detected a fault on the generator (alternator) F-terminal (field) circuit. The F-terminal circuit controls the generator field current to regulate charging voltage.

Symptoms

• Battery light on
• Overcharging or undercharging
• Battery damage from overcharging
• Dim lights

Common causes

• Faulty generator/alternator
• F-terminal wiring damage
• PCM control driver failure
• Corroded connector

Diagnostic steps

1. Test generator field voltage
2. Inspect F-terminal wiring
3. Test generator output regulation
4. Check PCM field control signal

Repair notes

Test and replace generator if field control is faulty. Inspect wiring.

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