OBD Guide
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P063B

Generator Voltage Sense Circuit A Range/Performance

P063B is an OBD-II diagnostic trouble code meaning: Generator Voltage Sense Circuit A Range/Performance. Common causes: worn brushes or alternator diode bridge, alternator drive belt slipping or worn. Estimated repair cost: $11–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–278 (est.)

Symptoms

  • Check Engine light comes on
  • On-board voltage is unstable or below normal
  • Gradual discharge of the battery while the engine is running
  • Unstable operation of electrical equipment
  • Battery or charging indicator on panel

Causes

  • Worn brushes or alternator diode bridge
  • Alternator drive belt slipping or worn
  • Contamination or oxidation of sensor circuit terminals and connectors
  • Partial malfunction of the generator windings
  • Voltage regulator malfunction

How to Fix

  1. Check charging voltage under load (turn on lights, air conditioning, fan)
  2. Inspect the condition and tension of the generator drive belt
  3. Check the condition of the battery terminals and generator power wires
  4. Carry out a generator load test
  5. Check the generator voltage sensor signal with a scanner in the speaker
  6. If wear is confirmed, replace or repair the generator

Related codes

P063AP063CP063DP0622P0562P0563

Error P063B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P063B code mean?

P063B is an OBD-II diagnostic trouble code that indicates: Generator Voltage Sense Circuit A Range/Performance

What causes a P063B error code?

The most common causes of P063B include: Worn brushes or alternator diode bridge; Alternator drive belt slipping or worn; Contamination or oxidation of sensor circuit terminals and connectors; Partial malfunction of the generator windings.

How do I fix a P063B diagnostic trouble code?

To fix P063B: Check charging voltage under load (turn on lights, air conditioning, fan). Inspect the condition and tension of the generator drive belt. Check the condition of the battery terminals and generator power wires. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P063B?

Limited driving only, diagnose soon

How much does it cost to fix P063B?

The estimated repair cost for P063B is $11–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat