P0539 - OBD Trouble Code

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The error code P0539 can be defined as A/C Evaporator Temperature Sensor Circuit Intermittent. If there would be either too high or low in the voltage signal coming from the A/C evaporator temperature sensor, then it would give rise to P0539 trouble code and it would also result in the illumination of the check engine light.

If the powertrain control module would detect that the voltage reading from the A/C evaporator temperature sensor is outside of the parameters which have been set by the manufacturer, then the P0539 fault code would be stored. The other related trouble codes are P0535, P0536, P0537, and P0538 code.

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

• Flaws in the engine control module
• The sensor's circuit might have some wiring issue
• Flaws in the A/C Evaporator core
• The A/C evaporator temperature sensor might be faulty
• Quirks in the wiring harness connector
• Electrical connection might be intermittent
• Problems related to internal resistance

1. Engine Control Module - There can be some issues with the Engine Control Module due to which you may see P0539 code appearing over and over again. Visit us to buy best quality Engine Control Module online.
2. Air Conditioning Evaporator - A lot of issues can arise do to defective AC Evaporator. Did you just see P0539 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Air Conditioning Expansion Valve - Faulty AC Expansion Valve can be the reason why P0539 code is flashing. Visit us to purchase top notch AC Expansion Valve online.
4. Engine Wiring Harness - It is an important auto part which needs full care. A faulty Engine Wiring Harness can be a reason behind the flashing up of P0539 code.
5. Air Conditioning Compressor Clutch - OBD Code P0539 can appear because of faulty AC Compressor Clutch.
6. Powertrain Control Module - P0539 error code also relates to problems with the powertrain control module. Find all the Powertrain related parts with us.

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 P0539 here:

Common Symptoms

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

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Make sure to replace the expansion valve if the A/C system is drawing too low of a pressure with the blower set to low
• You can always replace any defective wiring, connectors or components
• After testing the A/C with the A/C gauges hooked up and the A/C at max and the blower on high, fill the A/C with the appropriate amount of refrigerant
• The faulty evaporator temperature sensor should be replaced
• Restore the climate control head or A/C compressor switch if these components prove faulty after further testing

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If you want to diagnose and repair a P0539 trouble code then a mechanic requires certain equipment, including an OBD-II scanner, digital volt/ohmmeter, and a set of air conditioning gauges. The mechanic should also perform the following when attempting to diagnose a P0539 trouble code:

• First of all, you must visually inspect all wiring, connectors, and components
• Connect the scanner to the diagnostic connector in order to download any stored trouble codes or freeze frame data. This information could come in handy with diagnosing the vehicle's problems, especially if the condition is intermittent
• Clear the P0539 trouble code and test the system
• If it returns, connect the A/C gauges to the proper fittings and turn the A/C on max and the blower on high. The mechanic should then compare any readings to the manufacturer's specifications
• Next, after adding the required amount of refrigerant, the mechanic should turn the blower speed to low and compare the readings to the manufacturer's specifications
• If the A/C system is operating normally, the mechanic should unplug the evaporator temperature sensor electrical connector and test the resistance of the sensor using the digital volt/ohmmeter
• Carefully clear the P0539 trouble code and retest the system to see if the trouble code returns

Common Mistakes When Diagnosing The P0539 Code

• Most of the mechanics think that the P0539 trouble code is appearing because of low refrigerant, which can be totally wrong
• He might then overfill the refrigerant and it can cause a catastrophic failure
• You must visit a qualified mechanic to avoid such a situation as he will use proper tools and would do proper service of the A/c system