Skip the auto shop - Our mechanics make house calls

P0535 OBD-II Trouble Code: A/C Evaporator Temperature Sensor Circuit

check engine light

P0535 code definition

The P0535 trouble code detects an issue with the A/C evaporator temperature sensor circuit.

What the P0535 code means

The P0535 code is a standard OBD-II trouble code that signals a problem with the A/C (air conditioner) evaporator temperature sensor. The A/C temperature sensor delivers voltage readings to the powertrain control module (PCM) which monitors the system to make sure it is functioning properly. When the PCM receives variations in the voltage that are higher or lower than they should be, then the P0535 code will be illuminated.

What causes the P0535 code?

The P0535 trouble code is usually the result of a defective evaporator temperature sensor. However, there are a few other potential causes, including:

  • Defective expansion valve, which causes the evaporator core to freeze up
  • Issues with the electrical components, such as shorter or open wires, and damaged or corroded connectors
  • Overcharged A/C system
  • Insufficient refrigerant levels
  • Defective climate control head

What are the symptoms of the P0535 code?

When the P0535 trouble code has been detected, the check engine soon Warning Light will likely illuminate on the dashboard, and the A/C light may flash on the climate controls. In most cases, the air conditioning system will be not function, and in many cases the evaporator case may drip on the vehicle’s interior.

How does a mechanic diagnose the P0535 code?

The P0535 code will be diagnosed using a standard OBD-II trouble code scanner. A reputable mechanic will examine the freeze frame data with the scanner, to assess the code, and check to see if any additional trouble codes are present. The codes should then be reset, and the vehicle should be restarted to see if the code returns. If the code does not return, it is either an intermittent error, or the code has been erroneously detected.

If the P0535 code returns, then the mechanic should begin with a visual inspection of the air conditioning system’s electrical components. All wires, connectors, harnesses, and fuses should be inspected for damage, and replaced if necessary. The mechanic should also check the refrigerant levels to make sure they are sufficient.

After checking the electrical components, the technician should examine the evaporator temperature sensor, as this is the most likely issue. If the sensor itself is not damaged, the valve, and then the climate control head should be inspected

After any component is replaced, the codes should be reset and the vehicle restarted to see if the codes return.

Common mistakes when diagnosing the P0535 code

The most frequently made diagnostic mistake with the P0535 code comes from a failure to comply with the OBD-II trouble code diagnosis protocol. The protocol should be followed step by step at all times, to ensure a proper, thorough, and efficient fix.

It is common for people to assume that the P0535 code is a result of insufficient refrigerant levels, which can lead people to add more refrigerant when the vehicle has enough. This can result in excessive refrigerant, which can cause lots of damage.

How serious is the P0535 code?

A vehicle with the P0535 code triggered is still drivable. However, the air conditioning system probably won’t work, and you never know when you the system will be needed for health or comfort. As a result, the P0535 trouble code should be addressed as soon as you get the chance.

What repairs can fix the P0535 code?

Some of the repairs for a P0535 trouble code are:

Additional comments for consideration regarding the P0535 code

In most vehicles, the A/C evaporator temperature circuit issues will need to be detected by the PCM on three occasions before the P0535 trouble code is triggered.

Need help with a P0535 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: Would the throttle positioning sensor cause the engine to rev up while driving?

Your issues may stem from a variety of components. Have the vehicle scanned for diagnostic troubleshooting codes. This will give you more information on any issues the computer has detected. Some will not illuminate the Check Engine Light. The vehicle...

Q: Two injectors clogged

Hi. I know the injectors are expensive, but there is a lot of labor involved in their replacement. At the very least, they should be replaced one bank at a time, or all at once. A faulty injector will not...

Q: Blowing fuse for turn, ABS, and Hvac fan, Also will start in any gear

Hello, thanks for writing in about your Chrysler Town & Country. If it will start in any gear, then there is more than likely a fault in the neutral safety circuit. It can be as simple as the neutral safety...