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P0531 Powertrain

A/C Refrigerant Pressure Sensor Range/Performance

The A/C refrigerant pressure sensor signal is implausible against operating conditions. Reading does not change as expected when the compressor cycles or ambient conditions change.

Affected components

  • Ac pressure sensor
  • Ac compressor

Common causes

  • High likelihood: Pressure sensor drift
  • Medium likelihood: Refrigerant charge incorrect
  • Low likelihood: Wiring fault

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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