OBD Guide
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P0622

Generator Field/F Terminal Circuit

P0622 is an OBD-II diagnostic trouble code meaning: Generator Field/F Terminal Circuit. Common causes: open or short circuit in the field winding circuit, faulty generator voltage regulator. Estimated repair cost: $17–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–278 (est.)

Symptoms

  • Check Engine Light and Battery Light Come On
  • Battery not charging or charging at maximum voltage
  • Rapid battery drain
  • Battery overheating due to constant recharging
  • Electronics malfunction due to unstable voltage

Causes

  • Open or short circuit in the field winding circuit
  • Faulty generator voltage regulator
  • Broken wire terminal F between the generator and the computer
  • Oxidation of the generator connector
  • Internal malfunction of the generator field winding

How to Fix

  1. Measure the charging voltage with the engine running (normal 13.8–14.4 V)
  2. Check the terminal F wire from the generator to the ECU for open and short circuits.
  3. Measure the resistance of the field winding (the norm is 2–5 Ohms depending on the brand)
  4. Check the voltage regulator - measure the control signal at terminal F
  5. If the winding breaks, replace the generator or rewind the winding
  6. If the generator is working, ECU diagnostics

Related codes

P0620P0621P0623P0625P0626

Error P0622 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0622 code mean?

P0622 is an OBD-II diagnostic trouble code that indicates: Generator Field/F Terminal Circuit

What causes a P0622 error code?

The most common causes of P0622 include: Open or short circuit in the field winding circuit; Faulty generator voltage regulator; Broken wire terminal F between the generator and the computer; Oxidation of the generator connector.

How do I fix a P0622 diagnostic trouble code?

To fix P0622: Measure the charging voltage with the engine running (normal 13.8–14.4 V). Check the terminal F wire from the generator to the ECU for open and short circuits.. Measure the resistance of the field winding (the norm is 2–5 Ohms depending on the brand). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0622?

Limited driving only, diagnose soon

How much does it cost to fix P0622?

The estimated repair cost for P0622 is $17–278. Actual cost depends on your vehicle, location, and labor rates.

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