OBD Guide
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P063C

Generator Voltage Sense Circuit A Low

P063C is an OBD-II diagnostic trouble code meaning: Generator Voltage Sense Circuit A Low. Common causes: break in the signal wire of the generator voltage sensor, poor contact or oxidation of the generator connector. 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
  • Battery or charging indicator
  • Low voltage on-board network
  • Battery low
  • Unstable operation of electrical consumers

Causes

  • Break in the signal wire of the generator voltage sensor
  • Poor contact or oxidation of the generator connector
  • Signal circuit short to ground
  • Malfunction of the voltage regulator (with built-in sensor)
  • ECU malfunction (rare)

How to Fix

  1. Measure the voltage in the sensor circuit with a multimeter according to the electrical diagram
  2. Check the signal wire from the generator to the ECU for open and short to ground
  3. Clean and check all generator connectors
  4. Check generator voltage regulator
  5. Replace voltage regulator or alternator if fault is confirmed

Related codes

P063AP063BP063DP0562P0622

Error P063C by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P063C code mean?

P063C is an OBD-II diagnostic trouble code that indicates: Generator Voltage Sense Circuit A Low

What causes a P063C error code?

The most common causes of P063C include: Break in the signal wire of the generator voltage sensor; Poor contact or oxidation of the generator connector; Signal circuit short to ground; Malfunction of the voltage regulator (with built-in sensor).

How do I fix a P063C diagnostic trouble code?

To fix P063C: Measure the voltage in the sensor circuit with a multimeter according to the electrical diagram. Check the signal wire from the generator to the ECU for open and short to ground. Clean and check all generator connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P063C?

Limited driving only, diagnose soon

How much does it cost to fix P063C?

The estimated repair cost for P063C is $11–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat