P0996 - OBD Trouble Code

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The trouble code P0996 is defined as Transmission Fluid Pressure Sensor/Switch "F" Circuit Intermittent. The mechanical transmission pressures are converted into an electrical signal by the TFPS for the powertrain control module or transmission control module. Generally the other controllers utilizing the vehicle's data communication bus would then be informed by the PCM/TCM.

The P0996 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 "F" Circuit High?

• TFPS sensor circuit might have intermittent open or short
• Intermittent short to voltage in the signal circuit to the TFPS sensor
• PCM might not be functioning properly
• Intermittent short to ground in the signal circuit to the TFPS sensor
• Some issues related to the TFPS sensor
• PCM and TCM failures
• There can be internal mechanical transmission problems

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2. Powertrain Control Module - A broken Powertrain Control Module can cause a lot of issues. It would be nice if you get it replaced on time.
3. Auto Transmission Control Module - Everything is fine with the engine control module and still OBD code P0996 flashing? Then there is definitely some fault with the Auto Transmission Control Module. Get it checked and replace if needed.
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6. Electronic Control Unit - A broken Electronic Control Unit can cause a lot of issues. It would be nice if you get it replaced on time.

Have you ever wondered why it is so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P0996

Common Symptoms:

• The service engine soon light lighting up
  
• Scent of the transmission fluid
• Smoke from under the car
• Transmission might slip out of gear or which are impossible to put into gear

To correct this P0996 issue you might need to undergo few replacements for the defective parts such as:

• Fix the defective transmission and perform a complete inspection of the transmission
• Repair/replace the faulty electrical circuitry for the sensor
• Repair or replace the faulty transmission temperature sensor
• The malfunctioning PCM should be repaired or replaced as per the need

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If you want to easily diagnose this fault P0996 code, then all you have to do is to follow the steps which are mentioned below:

• It is important to conduct a proper diagnosis before doing any repairs of the vehicle. A diagnostic scanner, a reliable source of vehicle information, and a digital volt/ohmmeter (DVOM) will be required in order to arrive at an accurate diagnosis of a code P0996. 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 P0996 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 P0996 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 P0996 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. It is essential to program the PCM/TCM rightly.

Common Mistakes When Diagnosing The P0996 Code

• Powertrain Control Module and Transmission Control Module faulty
• Failure in the transmission fluid pressure sensor
• Some issues related to the wiring and connectors to the sensor and circuit