OBD Guide
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P0626

Generator Field/F Terminal Circuit High

P0626 is an OBD-II diagnostic trouble code meaning: Generator Field/F Terminal Circuit High. Common causes: shorting the f terminal wire to the positive power wire, voltage regulator malfunction (stuck at maximum position). Estimated repair cost: $17–278.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–278 (est.)

Symptoms

  • The Check Engine light comes on
  • Charging voltage is higher than normal (more than 14.8 V)
  • Overheating and boiling of the battery
  • Battery light is on
  • Possible electronic failures due to high voltage

Causes

  • Shorting the F terminal wire to the positive power wire
  • Voltage regulator malfunction (stuck at maximum position)
  • Open voltage regulator feedback circuit
  • Internal ECU fault (maximum excitation signal)
  • Short circuit in the generator excitation winding

How to Fix

  1. Immediately measure the charging voltage - if the value is above 15 V, turn off the engine
  2. Check terminal F wire for short to positive
  3. Disconnect the terminal F wire from the generator - measure the charging voltage without a control signal
  4. Check the voltage regulator - replace if faulty
  5. Check the condition of the battery - is it boiling?
  6. If the wire is ok, the regulator or ECU is faulty

Related codes

P0620P0622P0625P0563

Error P0626 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0626 code mean?

P0626 is an OBD-II diagnostic trouble code that indicates: Generator Field/F Terminal Circuit High

What causes a P0626 error code?

The most common causes of P0626 include: Shorting the F terminal wire to the positive power wire; Voltage regulator malfunction (stuck at maximum position); Open voltage regulator feedback circuit; Internal ECU fault (maximum excitation signal).

How do I fix a P0626 diagnostic trouble code?

To fix P0626: Immediately measure the charging voltage - if the value is above 15 V, turn off the engine. Check terminal F wire for short to positive. Disconnect the terminal F wire from the generator - measure the charging voltage without a control signal. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0626?

Yes, but get it checked soon

How much does it cost to fix P0626?

The estimated repair cost for P0626 is $17–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat