P0537 OBD Error Code: Problem & Solutions

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If the powertrain control module would store the voltage readings from the A/C evaporator temperature sensor which would be outside of normal parameters, then the P0537 error code would start appearing.

The P0537 trouble code can be defined as A/C Evaporator Temperature Sensor Circuit Low.

Willing to learn something more about the P0537 trouble code? The temperature switch in an automotive A/C system which is mounted in the evaporator core fins and is of a capillary design. When the evaporator core’s temperature would start dropping, the capillary pressure in the switch would also drop, lowering circuit resistance and increasing the voltage input signal to the PCM. The PCM sees this as a change in temperature and cycles the compressor clutch on and off. A trouble code is registered when these voltage fluctuations are at odds with the reference limit. Usually three failure cycles are necessary before the PCM will store a code and illuminate the malfunction indicator lamp.

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

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

1. Engine Control Module - A faulty Engine Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Air Conditioning Expansion Valve - If everything is alright with PCM, then there is surely some defect in AC Expansion Valve. Get it replaced before the situation gets worse.
3. Air Conditioning Compressor Clutch - P0537 code can display due to some faults in the AC Compressor Clutch. So, it is very important to replace the AC Compressor Clutch with us at equitable prices.
4. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A defective Powertrain Control Module can cause a lot of issues like displaying P0537 code.
5. Engine Wiring Harness - There can be some issues with the Engine Wiring Harness due to which you may see P0537 code appearing over and over again. Visit us to buy best quality Engine Wiring Harness online.
6. Air Conditioning Evaporator - Are you facing some faults in your Air Conditioning Evaporator? Don’t worry and get them replaced or else P0537 code can turn up.

It is vital 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 P0537 here:

Common Symptoms

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

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Repair or replace the wiring or A/C/climate control head unit
• It is very important to replace the evaporator core temperature sensor
• Make sure to replace the expansion valve
• You can always add refrigerant to the system

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Here are some steps which you should follow in order to diagnose this fault code:

• 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
• After that you must test the temperature sensor. 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
• 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 P0537 Code

• Overfilling the vehicles’ systems with refrigerant would surely result in a lot of problems
• You must know that it’s absolutely necessary to add refrigerant before moving forward, and only qualified personnel with the right tools/equipment should attempt this service