P0535 - OBD Trouble Code

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The error code P0535 can be defined as A/C Evaporator Temperature Sensor Circuit. The P0535 trouble would start appearing when there is an issue with the A/C evaporator temperature sensor circuit.

The P0535 error code shows that there is some issue with the A/C (air conditioner) evaporator temperature sensor. It is the A/C temperature sensor which delivers the readings of the voltage to the powertrain control sensor. It will then carefully monitor the system to make sure that it is working properly. The P0535 fault code would start illuminating when the PCM would receive variations in the voltage that are higher or lower than they should be.

What causes this problem with the A/C Evaporator Temperature Sensor Circuit?

• Intermittent electrical connection
• Defects in the A/C Evaporator core
• The sensor's circuit might have some wiring issue
• Wiring harness connector problems
• The A/C evaporator temperature sensor might be faulty
• Flaws in the engine control module
• Internal resistance issues like corrosion, damaged harness, overheated circuit, etc

1. Engine Wiring Harness - OBD Code P0535 can appear because of faulty Engine Wiring Harness.
2. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0535 code appearing over and over again. Visit us to buy best quality PCM online.
3. Engine Control Module - Are you facing some faults in your Engine Control Module? Don’t worry and get them replaced or else P0535 code can turn up.
4. Air Conditioning Expansion Valve - Common cause behind this P0535 error code can be some fault in AC Expansion Valve. So, it will be a good decision to replace them now.
5. Air Conditioning Evaporator - Engine Control Module is perfectly fine but still but having that trouble code P0535 flashing? In such a situation your AC Evaporator might be faulty. Why don’t you think of getting that replaced?
6. Air Conditioning Compressor Clutch - The P0535 code can also arise due to some issues in AC Compressor Clutch. So, it is advised to replace them as soon as possible.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0535 here:

Common Symptoms

• A/C compressor clutch might not engage
• HVAC system may not function properly
• The air blowing from the air vents might not be cold
• Erratic/fluctuating fan air temperature

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0535:

• Carefully replace or repair the expansion valve
• The defective evaporator temperature sensor should be replaced
• It is very important to replace the damaged wires, connectors, harnesses, or fuses
• You can always add refrigerant
• Make sure to restore the climate control head

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

You must begin by checking the technical service bulletins for your vehicle. Getting access to a known fix can save you time as well as money during the process of diagnosis

Step 1

• First of all, locate and visually inspect the A/C evaporator temperature sensor. The evaporator core is located inside the HVAC (heating ventilation and air conditioning) air box. The A/C evaporator temperature sensor is typically mounted to the evaporator itself or very near it. You may be able to gain access by looking under the dash fairly easily
• It may also be possible that you will need to remove numerous plastic panels and/or the radio so always refer to your service manual for the specific location. Keep an eye out for any signs of overheating and/ or corrosion on the sensor itself. This may indicative of your problem. You must replace the sensor if it has some defects
• Just make sure that your interior is at a reasonable temperature. Start prying on cold plastic and it will break so be careful

Step 2

• The temperature sensor should then be tested. Most times, these sensors are a resistor type sensor. In other words, the resistance within the sensor changes in direct relation to the temperature. Understanding how this works probably gives you some idea on how to diagnose the sensor itself. Usually, the manufacturer will have a desired resistance at certain temperatures
• Using your multimeter you can record the resistance within the sensor and compare it to the desired values specified by your manufacturer. If an open is present, you may have an internal resistance within the sensor itself and will need to be replaced
• Your manufacturer may have a specific diagnostic strategy depending on which type of sensor, make, model, etc. so always refer to your service manual. If uncomfortable with electrical testing and/or working around refrigeration systems for that matter, bring your vehicle to a reputable shop

Step 3

Inspect the wiring. Given the location of the evaporator temperature sensor, it may be easy to locate and follow the harness to check for any obvious signs of damage

Common Mistakes When Diagnosing The P0535 Code

• Mechanics generally overcharge their vehicles system with refrigerant after seeing the P0535 trouble code and it might result in some serious issues
• It is essential to make certain that it’s absolutely necessary to add refrigerant before moving forward and only qualified personnel with the right tools as well as equipment