P0643

2017-10-10

Description:

  • The fault code P0643 indicates that there is an issue with the reference voltage circuit for a sensor, specifically circuit A. This can result in the engine running poorly or not starting at all.

Possible Symptoms:

  • Illuminated check engine light

  • Poor engine performance or failure to start

  • Reduced engine power or acceleration

  • Rough idle or stalling

Possible Causes:

  • Failed sensor reference voltage circuit

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed engine control module (ECM)

Related Parts:

  • Engine Control Module (ECM): ECM is the part of the car computer that controls the engine system and performance. Problems lead to poor fuel economy, engine stalling & unwanted engine vibrations

Possible Solutions:

  • Replace the faulty sensor reference voltage circuit

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the engine control module (ECM) if necessary

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