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P0536 OBD-II Trouble Code: A/C Evaporator Temperature Sensor Circuit Range/Performance

check engine light

P0536 code definition

The P0536 trouble code detects an issue with the A/C evaporator temperature sensor circuit.

What the P0536 code means

The P0536 code is a generic OBD-II trouble code that notes a problem with the A/C (air conditioner) evaporator temperature sensor. The temperature sensor is responsible for sending system voltage data to the powertrain control module (PCM), which then uses the information to help control the A/C system. When the PCM receives voltage readings that are excessively low or high, the P0536 trouble code will be detected.

What causes the P0536 code?

The P0536 trouble code is usually caused by a defective evaporator temperature sensor. However, there are a few other potential causes, such as:

  • Malfunctioning expansion valve (which results in an evaporator core freeze up)
  • Damaged electrical components, such as loose wires or corroded connectors
  • Overcharged A/C system
  • Low levels of refrigerant
  • Malfunctioning climate control head

What are the symptoms of the P0536 code?

The P0536 trouble code will usually be accompanied by the check engine soon Warning Light, and may also result in the A/C light on the climate controls flashing repeatedly. Most notably, when the P0536 code is detected, the air conditioning system will likely not be working. There may also be water drips from the system, which may be detectable from inside the vehicle.

How does a mechanic diagnose the P0536 code?

The P0536 could should be diagnosed with the assistance of an OBD-II trouble code scanner. A trained technician will look at the freeze frame data from the scanner to assess the code, and to look for any additional codes that have been detected. The codes should then be reset, and the vehicle should be restarted. If the P0536 code does not return, it was likely erroneously detected, or possibly an intermittent issue.

If the code does return, the mechanic will start by visually assessing the electrical components of the A/C system. All of the wires and connectors should be checked to make sure they are in proper condition and working well. Any electrical components that are not up to standards should be replaced. In addition to this, the technician should check the refrigerant levels, and add more refrigerant if necessary.

Following these steps, an A/C gauge should be connected to the vehicle. The car can then be turned on, and the A/C and blower speed set to their highest settings. The mechanic can compare these readings to the manufacturer’s settings to help determine where the issue is arising. It is likely that the issue is coming from a failed evaporator temperature sensor, but the readings can both confirm that, and let a technician know if a larger issue is causing the sensor failure.

After any and all repairs, the codes should be reset and the vehicle restarted before the mechanic continues.

Common mistakes when diagnosing the P0536 code

The most common mistake made when diagnosing the P0536 code comes from a failure to adhere to the OBD-II trouble code diagnosis protocol. The diagnosis protocol should always be followed exactly, to ensure that the inspection is performed correctly, and in the most efficient order.

It is fairly common for refrigerant to be added as a solution, even when the refrigerant levels are sufficient. This can result in excess refrigerant, which can be very harmful to the system.

How serious is the P0536 code?

A vehicle with the P0536 code is still very drivable, but the air conditioning system is unlikely to work. Since you never know when you’ll need your air conditioning, it’s important to have the system inspected and repaired as soon as possible.

What repairs can fix the P0536 code?

Some of the fixes for the P0536 code include:

Additional comments for consideration regarding the P0536 code

After the problem has been repaired, it’s a good idea for the mechanic to use the A/C gauge to make sure that all components are functioning properly.

Need help with a P0536 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
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