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2010 BUICK ENCLAVE
3.6L V6•AWD•AUTOMATIC•gas
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor547Torque2322Fluid8DTC941Battery1Maintenance0Recalls6
P1638moderate severityPowertrain

Generator F-Terminal Circuit

on 2010 Buick Enclave 3.6L V6 · AWD

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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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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