P0645

2017-10-10

Description:

  • The fault code P0645 signifies that there is a problem with the circuit responsible for controlling the A/C clutch relay. This may cause issues with the A/C system operation.

Possible Symptoms:

  • Inoperative A/C system

  • Illuminated check engine light

  • Poor A/C system performance

Possible Causes:

  • Failed A/C clutch relay

  • Shorted or open wiring or connections in the circuit

  • Corroded or loose electrical connections

  • Failed engine control module (ECM)

Related Parts:

  • AC Clutch Relay: The A/C clutch runs the A/C compressor. Problems lead to reduced or no AC cooling

Possible Solutions:

  • Replace the A/C clutch relay

  • Check for and repair any damaged wiring or connections

  • Clean or tighten any loose or corroded electrical connections

  • Replace the engine control module (ECM) if necessary

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