AutoCodes – Chevrolet – P0533 2018 Chevrolet Silverado

P0533 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 751

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0533 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - A/C Refrigerant Pressure Sensor Circuit High Input - AutoCodes.com — P0533 2018 Chevrolet Silverado Code - A/C Refrigerant Pressure Sensor Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0533 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P0533 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2018 Chevrolet Silverado Code

1. What does the OBDII code P0533 mean on a 2018 Chevrolet Silverado?

P0533 indicates that the A/C refrigerant pressure sensor circuit has a high voltage input, suggesting a possible issue with the sensor or related wiring.

2. What are the common symptoms of code P0533 in a 2018 Chevrolet Silverado?

Symptoms may include the A/C not functioning properly, warm air blowing from the vents, or the A/C compressor not engaging.

3. What causes the P0533 code in a 2018 Chevrolet Silverado?

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

4. Can overcharging the A/C system trigger code P0533?

Yes, overcharging the A/C system can lead to excessive refrigerant pressure, which may cause the P0533 code to appear.

5. How do you diagnose the P0533 code on a 2018 Chevrolet Silverado?

Diagnosis involves checking the A/C refrigerant pressure sensor, inspecting wiring and connectors for damage, and verifying refrigerant pressure levels with a pressure gauge.

6. Can a faulty A/C refrigerant pressure sensor cause code P0533?

Yes, a malfunctioning sensor can send incorrect voltage signals to the A/C control module, triggering the P0533 code.

7. Is it safe to drive with the P0533 code on a 2018 Chevrolet Silverado?

While it may not directly affect drivability, the A/C system may not function properly, which can be inconvenient, especially in hot weather.

8. How is the P0533 code typically fixed on a 2018 Chevrolet Silverado?

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

9. How much does it cost to fix the P0533 code on a 2018 Chevrolet Silverado?

Costs vary but may range from $150 to $400, depending on whether the issue is with the sensor, wiring, or refrigerant levels.

10. Can low refrigerant levels cause the P0533 code?

No, low refrigerant levels typically trigger different codes. P0533 is specifically related to high voltage input from the A/C refrigerant pressure sensor.