Guide To P0848 OBD Error Code Solutions

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Have you ever wondered why do you need a well-functioning transmission fluid pressure sensor? You need them to ensure smooth functioning of your transmission system. Now you must be wondering what does Circuit “B” means here? Well, it refers to a specific component of transmission fluid sensor circuit, and not the entire system.

Now coming to the question why and when does the PCM sets the OBD error code P0848? To know the answer, you will need to go through the subsequent sections of this article.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch B Circuit High?

• Malfunctioning fluid pressure sensor
• Faulty electronic pressure control solenoid
• Blocked hydraulic lines
• Low fluid causing mechanical failure
• Contaminated fluid
• Faulty powertrain control module

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Next important thing you need to know about are the common symptoms for this obd error code P0848 with your fuel volume control.

Common Symptoms

• Flashing of check engine light
• Increasing transmission problems
• Slipping of transmission
• Transmission overheating
• Transmission entering into limp in mode
• Torque converter clutch might start failing
• You will experience a fall in fuel efficiency

Wish to correct this error code with your vehicle? Do you know what all you should do to make your car free from this code? Well, don’t worry! We are here to guide you.

• You will need to either repair or replace the damaged wiring, connectors, or components.
• You might need to undergo transmission rebuilt if found damaged due to a low fluid condition.
• Also, install a new torque converter while rebuilding the transmission.
• Fix the transmission leaks.
• You will also need to replace the faulty hydraulic pump. While doing so make sure that this process requires the removal and partial disassembly of the transmission.
• If the torque converter is found to be faulty make sure to replace it.
• Also, replace the transmission fluid pressure sensor, electronic pressure regulator and electronic pressure control solenoid, if faulty.
• Replace the faulty powertrain control module. 

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0848 code to be stored:

Use the technical service bulletins specific to your vehicle’s make and model to help you understand the problem properly. This will not only help you to understand the specific issue but also help you to understand steps on how to fix it. Believe us it will save you a lot of time and money while diagnosing not only this code but for any other code too.

Also, you should start your diagnosis with all the power related error code or with the multiple code diagnosis as it will help you in understanding the reasons behind the error code P0848. Next on your list to do is to locate transmission fluid pressure sensor/switch on your vehicle to begin with the specific diagnosis. It will likely be attached to your vehicle’s valve body side inside the transmission. Once you figure out its location, next step for you to do is to check the connectors and wirings for any loose ends, bare wires, rubbing, scraping, burn spots or melted plastics. Now, take the connector apart and inspect the terminals very carefully inside the connector. Make sure that they don’t look burnt or have a green tint indicating corrosion. Make use of an electrical contact cleaner and a plastic bristle brush if cleaning of the terminals needs to be cleaned. Let dry and apply electrical grease where the terminals contact. Next step is to use a scan tool and clear all the existing trouble code from memory, and check if the P0848 code returns. In case it does not then the problem was mainly with the connectors only. In case it does return then the connections were most likely your problem.

This is a common area of concern for this code, as the external transmission connections have the greatest number of issues with corrosion. In case the code returns, then you will need to inspect the TFPS sensor and all the related connectors and circuits. Turn off the key and disconnect the electrical connectors at the TFPS sensor. Now, connect the digital voltmeter either to the ground or to the low reference terminal at the TFPS sensor wiring harness connector. Also connect the red lead of the DVOM to the signal terminals at the TFPS sensor wiring harness connector. Now, turn on the key and check for the manufacturer’s specifications. Make sure that the voltmeter reads either 12 volts or 5 volts. Wiggle the connections to check if they change. In case the voltage is incorrect, repair the power or ground wire, or replace the PCM/TCM. Now, if this test is passed then connect one lead of an ohmmeter to the signal terminal at the TFPS sensor and the other lead to the ground or low reference terminal at the sensor. Next, check for the manufacturer’s specifications on the resistance of the sensor to accurately test the resistance to pressure when there is no pressure applied to it. Again, wiggle the connector at the Transmission Fluid Pressure Sensor/Switch while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS. If you still continue to get the P0848 error code in spite of passing all these prior tests then it is signaling a failed TFPS sensor, although a failed PCM/TCM could not be ruled out, nor could internal transmission malfunctions until the TFPS sensor had been replaced. If you are in doubt, we suggest you to seek help from a trained automotive diagnostician. PCM/TCMs must be programmed or calibrated to the vehicle in order to be installed correctly.

Common Mistakes When Diagnosing the P0848 Code

Make sure that while diagnosing this error code, you don’t overlook wiring, circuitry, hydraulic blockages, transmission fluid, and transmission fluid pressure sensor.