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ElectricalSeverity Low: usually safe to drive

P0532A/C Refrigerant Pressure Sensor "A" Circuit Low

What it means

The A/C refrigerant pressure sensor signal voltage is lower than the sensor can normally produce (usually below about 0.2 V on a 0–5 V sensor). Most often the signal wire is shorted to ground or the 5 V supply is missing.

Symptoms

  • Air conditioning not working
  • Cooling fan running at high speed

Common causes

  • Signal wire shorted to ground or chafed through
  • 5 V reference open, or pulled down by another faulty sensor on the same supply
  • Failed A/C refrigerant pressure sensor
  • Water or corrosion in the connector

What to check first

  1. With the key on, measure the 5 V reference at the connector (about 4.8–5.1 V)
  2. Back-probe the signal and watch it while wiggling the harness
  3. Unplug sensors that share the 5 V reference one at a time and see whether the supply recovers
Can I drive with P0532? Usually yes. P0532 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0532: questions and answers

What does P0532 mean?

P0532: A/C Refrigerant Pressure Sensor "A" Circuit Low. The A/C refrigerant pressure sensor signal voltage is lower than the sensor can normally produce (usually below about 0.2 V on a 0–5 V sensor). Most often the signal wire is shorted to ground or the 5 V supply is missing.

What are the symptoms of P0532?

Air conditioning not working. Cooling fan running at high speed.

What causes P0532?

Signal wire shorted to ground or chafed through. 5 V reference open, or pulled down by another faulty sensor on the same supply. Failed A/C refrigerant pressure sensor. Water or corrosion in the connector.

How do you diagnose P0532?

1. With the key on, measure the 5 V reference at the connector (about 4.8–5.1 V) 2. Back-probe the signal and watch it while wiggling the harness 3. Unplug sensors that share the 5 V reference one at a time and see whether the supply recovers

Can I drive with P0532?

Usually yes. P0532 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.