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AutoCodes – GMC – P0533 2016 GMC Sierra

P0533 2016 GMC Sierra Code - A/C Refrigerant Pressure Sensor Circuit High Input

Quick Answer

The Engine Control Module (ECM) monitors the high side refrigerant pressure through the A/C Refrigerant Pressure Sensor. Common causes include A/C system low or overcharged with refrigerant, Cooling fans are inoperative, Faulty A/C Refrigerant Pressure Sensor. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0533 2016 GMC Sierra indicates A/C Refrigerant Pressure Sensor Circuit High Input.
Common causes
Common causes include A/C system low or overcharged with refrigerant, Cooling fans are inoperative, Faulty A/C Refrigerant Pressure Sensor.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
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Code Popularity 512
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 02, 2022
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Code P0533 2016 GMC Sierra Description

The Engine Control Module (ECM) monitors the high side refrigerant pressure through the A/C Refrigerant Pressure Sensor. The ECM supplies a 5 V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the ECM to vary. When the pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. The ECM may use this information to turn the cooling fans on as well as to monitor clutch engagement. The HVAC module will receive the A/C refrigerant pressure information from the ECM via serial data. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the A/C pressure is more than 428 psi (4.92 V).
OBDII Code P0533 2016 GMC Sierra - A/C Refrigerant Pressure Sensor Circuit High Input - AutoCodes.com
P0533 2016 GMC Sierra Code - A/C Refrigerant Pressure Sensor Circuit High Input
What does this mean?

What are the Possible Causes of the DTC P0533 2016 GMC Sierra?

  • A/C system low or overcharged with refrigerant
  • Cooling fans are inoperative
  • Faulty A/C Refrigerant Pressure Sensor
  • A/C Refrigerant Pressure Sensor circuit open or shorted
  • A/C Refrigerant Pressure Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0533 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0533 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0533 2016 GMC Sierra code?

Need more information on how to fix the P0533 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0533 2016 GMC Sierra Code

What does the OBDII code P0533 mean for a 2016 GMC Sierra?

The P0533 code indicates a high input signal from the A/C Refrigerant Pressure Sensor, which monitors the pressure in the air conditioning system.

What are the common symptoms of code P0533 in a GMC Sierra?

Symptoms may include the A/C not working, the A/C compressor not engaging, or the illumination of the check engine light.

What causes the P0533 code to appear in a 2016 GMC Sierra?

Common causes include a faulty A/C refrigerant pressure sensor, damaged wiring or connectors, excessive refrigerant pressure, or a malfunctioning A/C control module.

Can overcharged refrigerant cause the P0533 code?

Yes, excessive refrigerant pressure due to overcharging the system can trigger the P0533 code.

How do I diagnose the P0533 code on my GMC Sierra?

Start by checking the refrigerant pressure, inspecting the A/C refrigerant pressure sensor and its wiring for damage, and using a scan tool to verify sensor readings.

Can I drive my GMC Sierra with the P0533 code active?

You can drive the vehicle, but the A/C may not function properly, which could be problematic in hot weather. It's best to address the issue promptly.

How do I fix the P0533 code on a 2016 GMC Sierra?

Repairs might include replacing the A/C refrigerant pressure sensor, repairing damaged wiring or connectors, or correcting refrigerant pressure levels.

Is replacing the A/C refrigerant pressure sensor difficult?

Replacing the sensor is typically straightforward but may require a professional if refrigerant recovery is needed.

How much does it cost to fix the P0533 code on a GMC Sierra?

Repair costs vary but generally range from $100 to $300, depending on whether the sensor, wiring, or refrigerant needs attention.

Can a faulty A/C control module cause the P0533 code?

Yes, while less common, a malfunctioning A/C control module can contribute to the P0533 code and may require replacement.

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