The transmission fluid pressure (TFP) sensor keeps track of the pressure exerted by the fluid moving through the transmission. It sends the readings to the transmission control module (TCM) or powertrain control module (PCM) that runs various transmission-related processes.
If the TCM receives a signal from the transmission pressure sensor “G” circuit that doesn’t match what’s stored in its memory banks, it may log a P083B code.
Diagnostic trouble code (DTC) P083B stands for “Transmission Fluid Pressure Sensor/Switch “G” Circuit Range/Performance.”
In an automatic transmission, groups of solenoids control the flow of lubricant to various hydraulic circuits. Each solenoid group belongs to a circuit that is labeled by a letter. Thus, there is an “A” circuit, a “B” circuit, a “C” circuit, and so on.
Every hydraulic circuit is associated with a transmission gear. To shift from one gear to another, the solenoid group in charge of the appropriate circuit sends transmission fluid there.
The transmission fluid produces pressure as it flows through the circuit. The transmission fluid pressure sensor measures the pressure level, converts it into an electrical signal, and sends the reading to the TCM.
The PCM regularly checks the TFP sensor. If the signal from the “G” circuit doesn’t fall within the expected range of voltage, the control module will set the generic powertrain/engine code P083B.
Note: The definition of code P083B can differ depending on the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
The P083B code is a generic powertrain/engine code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to identify its underlying problem.
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:
Attempting to fix a P083B code can become a challenging task if you don’t have the right tools and know-how to test the transmission fluid pressure sensor. In most cases, it’s best to leave the job to professionals. If you’re a DIYer with advanced technical knowledge and hands-on auto repair experience, you can test and replace your transmission pressure sensor on your own. Make sure you rely on the appropriate repair manual or an online repair database.
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