P0870 - OBD Trouble Code

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The trouble code P0870 can be defined as Transmission Fluid Pressure Sensor/Switch "C" Circuit. This fault code is generally an electrical circuit problem, and can be set because of some mechanical problems like internal leakage, cracked or missing check balls in the valve body, low system operating pressure/main line pressure, stuck valve in the valve body and many more. Keep this in mind that this cannot be overlooked during the troubleshooting process, particularly when dealing with an intermittent issue.

It is always good to learn more! That is the reason why we are here to help you out in gaining more knowledge about the P0870 error code. The P0870 trouble code would indicate that a transmission fluid pressure which is not as per the predetermined limit has been detected by the PCM. Now when this would occur, the fault code would be stored and there would be an illumination in the malfunction indicator light. There can be some automobiles which might enter in the “limp-in” mode.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch "C" Circuit?

• There can be less transmission fluid
• Malfunctioning transmission high pressure pump
• There can be inoperative transmission which is also known as a slipping transmission
• Temperature sensor might be flawed
• Engine might start overheating
• Some issues related to the PCM

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2. Oxygen Sensor - A broken Oxygen Sensor can cause a lot of issues. It would be nice if you get it replaced on time.
3. Coolant Temperature Sensor - Everything is fine with the engine control module and still OBD code P0870 flashing? Then there is definitely some fault with the Coolant Temperature Sensor. Get it checked and replace if needed.
4. Air Fuel Ratio Sensor - Air Fuel Ratio Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0870 code may start flashing.
5. Manifold Absolute Pressure Sensor - A faulty Manifold Absolute Pressure Sensor can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Idle Air Control Valve - If everything is alright with PCM, then there is surely some defect in Idle Air Control Valve. Get it replaced before the situation gets worse.
7. Powertrain Control Module - P0870 code can display due to some issues in the Powertrain Control Module. So, it is very important to replace the Powertrain Control Module with us at equitable prices.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P0870 code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up
• Scent of the transmission fluid
• Appearance of the smoke
• Transmission might slip out of gear or which are impossible to put into gear

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 P0870:

• You must fix the defective transmission and you can always perform a complete inspection of the transmission
• Make sure to mend the faulty electrical circuitry for the sensor
• It is essential to restore the flawed wiring
• Repair or replace the quirky transmission temperature sensor
• The malfunctioning PCM should be repaired or replaced as per the need

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

Check for technical service bulletins which pertain to the vehicle, symptoms, and codes prior to beginning the troubleshooting process for any malfunction. In some circumstances this can save a lot of time in the long run by pointing you in the right direction. You can always check the vehicle records to verify the last time that the filter and fluid was changed if possible. You can start the process of diagnosis with the power associated trouble code or with a number of code diagnosis. This might be the reason why P0870 error code is appearing. After that the transmission fluid pressure sensor/switch should be situated on your specific automobile. The TFPS is generally found attached to the side of the valve body inside the transmission. It can also be situated on the side of the transmission case. Now once it has been located, then the connector as well as wiring should be visually located. You can always search for the wires which are bare, burned spots as well as plastic which has been melted. The connector should be pulled apart and the terminals which are inside the connector should be inspected properly. You must check if they are appearing burnt and if there is a green tint, then it would indicate that there is corrosion. This can happen if they are attached outside the case of the transmission. An electrical contact cleaner as well as plastic bristle brush should be used to clean the terminals as per the requirement. It should be allowed to dry properly and then electrical grease should be applied at the places where the terminals are in contact. By using a scan tool, all the diagnostic trouble codes should be cleared up from the memory. Then check if the P0870 code has returned or not. If you find out that it is not appearing again, then it would mean that there were some defects in the connections. Now if this error code returns, then you should definitely test the TFPS sensor as well as the related circuits. The electrical connector at the TFPS sensor should be disconnected with the key off. A digital voltmeter should be connected to the ground or low reference terminal at the TFPS sensor wiring harness connector. Then a read lead should be connected to the digital voltmeter. Then the key should be turned on and then engine should be off. You should carefully check the manufacturer's specifications. The reading of the voltmeter should be either 12 volts or 5 volts. You can always wiggle the connections to check if they are changing or not. Now if the voltage is not correct, then the ground wire should be repaired properly. Make sure to restore the PCM/TCM. Then one lead of an ohmmeter should be connected to the signal terminal at the TFPS sensor. Then the other lead should be connected to the ground at the sensor. You can always inspect the manufacturers specifications on the resistance of the sensor so that the resistance can be properly tested when no pressure has been applied to it. The resistance should be monitored and the connector at the Transmission Fluid Pressure Sensor/Switch should be wiggled. Now if all the tests have been passed and still the P0870 error code is appearing, then there is some issue with the TFPS sensor or there can be some failures in the internal transmission as well. So, make sure that you replace the TFPS sensor. If you are not sure about it, then you can always take help from the technician. The PCM/TCM should be programmed properly and at the same time should be calibrated so that it can be installed in a right manner.

Common Mistakes When Diagnosing The P0870 Code

• The mechanic might make a number of mistakes while diagnosing the P0870 trouble code as he might have a feeling that there is only a leakage in the transmission and rest everything is perfect.
• That is the main reason why it is important to do a proper diagnosis of the transmission so that it has not been damaged internally because of high temperatures.
• Now when the transmission has been diagnosed as well as repaired properly, only then the diagnostics on the sensor should be performed.