P0533 OBD-II Trouble Code: A/C Refrigerant Pressure Sensor Circuit High Input

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0533 code

P0533 is a diagnostic trouble code (DTC) for "A/C Refrigerant Pressure Sensor Circuit High Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P0533 DIAGNOSTIC Get a fair and transparent estimate upfront

P0533 code definition

The P0533 code shows when the signal circuit in the vehicle is detected to be too high.

What the P0533 code means

If the P0533 code is being displayed, that means the air conditioning refrigerant pressure in your vehicle is probably too high to safely function. Although it’s related to the air conditioning, if you’re driving in a cold winter climate, you could still see the code because AC is used for defogging your vehicle.

Simply put, the AC unit works as a heat pump. It removes warm air from inside your vehicle and transfers it outside by using radiators, a system of fans and a compressor. The key behind the whole system is the refrigerant – usually R-134a – which is responsible for using airs and tubes to circulate the air.

The ECM (Engine Control Module) monitors the AC unit, primarily assessing the refrigerant pressure. If it becomes too high or too low, the ECM will lock out the AC function completely in order to keep the compressor and the entire system from becoming damaged.

What causes the P0533 code?

There are a handful of common reasons your vehicle could be showing the P0533 code.

What are the symptoms of the P0533 code?

If your AC refrigerant pressure sensor circuit is sensing high input, the Check Engine Light should come on. You’ll most likely also notice that the air conditioning has become completely inoperative or is only blowing out warm air.

How does a mechanic diagnose the P0533 code?

The mechanic will use an OBD-II scanner, connecting it to the diagnostic connector, recording all stored codes and freeze frame data. They’ll then clear the codes and test drive the vehicle to see if the AC works and/or if the code comes back.

They will then use pressure gauges to test the AC by turning on the engine and putting the air conditioning on high. If the gauge shows a reading that falls below 29 psi and the compressor clutch engagement isn’t on, the mechanic will most likely just be able to add more refrigerant to solve the problem.

Common mistakes when diagnosing the P0533 code

As we just mentioned, it’s a mistake to assume that the sensor in charge of triggering the P0533 code is automatically accurate. This is why mechanics must examine it before assuming another problem exists and proceeding with repairs.

How serious is the P0533 code?

The P0533 code isn’t a sign that your life is in danger. At worst, your air conditioning simply won’t work. However, until a qualified mechanic addresses the issue, you’ll have a tough time staying cool during hot weather or using your defogger.

What repairs can fix the P0533 code?

  • The first thing a mechanic will most likely do is measure the refrigerant pressure by using manifold gauges.
  • They will then move on to looking for mechanical issues like damaged lines, moisture, leaks, or some type of blockage.
  • The pressure sensor should also be examined as it could simply be malfunctioning and there is no actual problem with the refrigerant.

Additional comments for consideration regarding the P0533 code

In some cases, you may simply be able to turn your vehicle off and back on, at which point the system will retest itself and activate the air conditioning if pressure is no longer a problem.

Need help with a P0533 code?

YourMechanic provides customers with certified mobile mechanics who will come to your home or office, diagnose your vehicle and repair any problems. Complete our online form or speak to a service advisor by calling 1-800-701-6230. We’ll provide you with a free quote and have a mechanic to your home or office right away.

Check Engine Light
Refrigerant
air conditioning
trouble codes
P0533

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0533 code.

SCHEDULE P0533 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P2134 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch F Circuit Intermittent
What What the P2134 code means? P2134 is an OBD-II generic code for the engine control module (ECM) detecting the throttle pedal position sensor F has an intermittent sensor return to the ECM What causes the P2134 code? The ECM...
P0293 OBD-II Trouble Code: Cylinder 11 Contribution/Balance Fault
P0293 P0293 Code Definition Cylinder 11 Contribution/Balance Fault What the P0293 code means The P0293 code indicates that the number eleven cylinder in your vehicle’s firing order is undergoing a fuel-related problem. Please note that P0293 is a generic code,...
P0791 OBD-II Trouble Code: Intermediate Shaft Speed Sensor “A” Circuit
P0791 means that there is an issue with the intermediate shaft speed sensor circuit due to a faulty sensor, solenoid, or wiring issues.

Related questions

Navigation screen went black
It sounds like two separate problems. Check your fuses for the radio and navigation. If it is the unit itself that is faulty, there are specialized places that will repair them, or you could replace it with a good used...
2008 Hyundai Sonata GLS 4 cyl. 108,000 miles, code P0011 (Cam position, Actuator A-Bank I, Timing over-advance)
Hello, thanks for writing in. I'd be happy to provide my insight. The cam position actuator is an engine component that is responsible for phasing the camshafts and altering the timing. It works using oil pressure, so you are good...
Limp mode - Honda N WGN
It is possible that the issue could be related to your throttle relay. The throttle relay would be located in your power distribution box under the hood. I would recommend swapping it with a similar relay to determine if the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com