Error Code P2519: What It Means & What To Do?

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The trouble code P2519 can be defined as A/C Request "A" Circuit. The refrigerant pressure through the Air Condition (A/C) Pressure Sensor is being monitored by the engine control module. This trouble code would be set by the ECM when the signal from the sensor would not be as per the specifications set by the manufacturer.

The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile. This error code would start indicating when the PCM has detected a voltage reading from a specific a/c refrigerant pressure sensor that would not fall within acceptable limitations. You can always consult the automobile service manual for the location of this particular sensor/switch.

What causes this problem with the A/C Request "A" Circuit?

• The refrigerant might be low
• There might be too much refrigerant
• Malfunctioning Low Side Pressure Sensor
• Low Side Pressure Sensor harness might be open or little
• Substandard electrical connection in the Low Side Pressure Sensor circuit

1. A/C Compressor - The AC compressor might not work properly due to rust, physical damage, oil leaks, or paint damage. Get it checked and replace if needed.
2. Engine Control Module - It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
3. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus, check and replace it, if required.
4. Electronic Control Unit - The ECU manages the cooling system to control the battery operating temperatures and thus must be replaced if found faulty. Thus, buy new ECU modules and components from us!
5. Diagnostic Tool - Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!

Willing to know some common symptoms of OBD Trouble Code P2519? Your wish is our demand. Have a look at them below:

Common Symptoms

• Visibility in the check engine light

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 P2519:

• First of all, you must add enough amount of refrigerant
• Repair or replace the quirky low side pressure sensor circuit
• Carefully adjust the faults in the low side pressure sensor
• Recondition the non-functioning low side pressure sensor harness

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• The average automotive AC system utilizes between one and four refrigerant pressure switches so that it can provide safe and efficient operation.
• Freon is utilized to distribute oil throughout the air conditioning system, so you can see that refrigerant pressure is crucial to a/c system longevity and operation.
• The pressure switches can be threaded onto metal a/c lines or inserted into the compressor.
• These switches are generally of a pressure sensitive "ON/OFF" design.
• Now as the pressure would rise in the a/c system it would press against spring tension in the low-pressure switch.
• When sufficient pressure is reached for proper system operation, then the contacts which are inside of the switch would be closed and the compressor clutch electrical circuit is completed, thus it would allow the clutch to engage.
• The high-pressure switches would operate in the same manner.
• When system pressure would become excessive, then it would press against spring tension inside the switch.
• When system pressure reaches a level that could be detrimental to the compressor and other major components, contacts inside the switch are opened and the electrical circuit for the a/c compressor is opened, which would cause the a/c clutch to disengage.
• Repeated failures (usually 3) of this nature are recorded by the powertrain control module.
• After a predetermined number of failure cycles would be completed, then this error code would be stored and there would be an illumination in the service engine soon lamp.
• Some models also disable the a/c compressor clutch until the code has been cleared. Several tools would be required to successfully diagnose this fault code.
• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Make sure to retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components appear to be in good working condition, connect the scanner (or code reader) to the diagnostic connector.
• Then the freeze frame data should be recorded. This information would be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored.
• You should continue by clearing the code and operating a vehicle to see if it returns.
• This will help to determine whether or not the malfunction is intermittent
• Now once all the codes are cleared, then you should test drive the vehicle to see if the code returns.
• If the code fails to immediately return, then it is an indication that you have an intermittent condition.
• Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases it should be allowed to worsen before a right diagnosis can be made.
• Connect the scanner or code reader and then record all stored trouble codes as well as freeze frame data.
• All the codes should be cleared up, then connect the a/c gauges, carefully start the car engine and then turn the a/c on high.
• The pressure gauge readings should be observed carefully.
• If the low-pressure gauge reading drops below 29 psi, and compressor clutch engagement is disabled, suspect a low freon condition.
• Slowly add freon until the low-pressure reading is approximately 35 psi (monitor high side pressure as well - it should maintain around 225 psi).
• If the compressor clutch is engaged and the a/c system begins to cool normally, check for leakage in the freon and then it should be repaired as per the requirement.
• If system pressure exceeds the manufacturer's minimum specifications (usually 30 psi) and the compressor clutch fails to engage, then it would indicate that there are some faults in the low refrigerant pressure sensor.
• Check for voltage and ground signals at the low pressure switch electrical connector.
• Compare your actual findings with manufacturer's specifications and repair open or shorted circuits as needed
• If voltage and ground signals coincide with the specifications set by the manufacturer, then test the low-pressure switch resistance utilizing the digital volt/ohmmeter.
• Compare your findings to the specifications set by the manufacturer and replace the switch as per the requirement.
• Then all the codes should be cleared up, connect the a/c gauges, start the engine and turn the a/c on high.
• The readings of the pressure gauge should be carefully observed.
• If the high-pressure gauge reading exceeds the manufacturer's maximum specification (usually 275 to 300 psi), turn the a/c system off and the pressure should be allowed to decrease.
• Turn the a/c back on and observe the electric condenser fan (if so equipped) operation.
• If the electric cooling/condenser fan/s are not working, diagnose the cause of this issue.
• Lack of electric cooling/condenser fan operation will cause high pressure to soar.
• If the fan is working and a/c system pressure exceeds maximum recommended specs, suspect a restriction in the orifice, expansion valve, accumulator, receiver dryer, or condenser. If the high-pressure reading is within specs and the compressor clutch fails to engage due to a high-pressure condition, perform a resistance test on the high-pressure switch and compare your findings with manufacturer's specifications.
• Restore the high pressure switch as required
• If the switch does fall within acceptable specifications, examine continuity in the system circuit
• Repair or replace defective electrical wiring and connectors as per the requirement. If a/c refrigerant pressure switches and circuitry fail to yield the cause of this malfunction, suspect a quirky climate control head or a/c compressor switch
• Check the unit according to specifications set by the manufacturer and replace components as needed.

Common Mistakes When Diagnosing The P2519 Code

• Some issues related to the A/C compressor
• Failure in the A/C compressor relay
• There might be some faults in the powertrain control module
• Issues related to the wiring