Error code

OBD2 P0622

OBD2P0622
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Generator Field/F Terminal Circuit.

Severity

moderateCan drive but may experience electrical issues as the battery drains.

Summary

Code P0622 indicates a malfunction in the alternator's field control circuit, which is responsible for regulating the electrical output of the alternator. This issue typically affects modern vehicles where the Powertrain Control Module (PCM) manages the charging system.

Symptoms

  • Illuminated charge indicator warning light
  • Signs of a flat or run-down battery
  • Electrical functions may stop working as the battery drains

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and connectors
  • Defective alternator
  • Defective PCM (Powertrain Control Module)

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Inspect wiring between alternator and PCM, including fuses and fusible links.
  3. Check battery terminals for corrosion or damage.
  4. Test voltage in the wire supplying current to the battery.
  5. Identify and test resistance and continuity of the field duty cycle circuit.
  6. Locate and test PWM signal wire's resistance and continuity.

Fixes

  • Replace damaged wiring, connectors, or alternator as needed.

FAQ

Can I drive with P0622?

You can drive but may experience electrical issues and a flat battery over time.

What causes P0622?

Common causes include damaged wiring, connectors, or alternator malfunction.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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