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P0870 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor/Switch C Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0870 code indicates that the powertrain control module (PCM) has determined that the pressure of the transmission fluid is not within the desired range.
The P0870 is an OBD-II generic code and it will occur if transmission fluid increases or decreases to a level that is not within the programmed limits.
There are several reasons that the P0870 can occur:
The P0870 code triggers the code and also the service engine light. Most mechanics or technicians also say that a major sign that this code is going to appear is the smell of the transmission fluid as it overheats, and the smoke that may appear. Drivers will experience transmissions that slip out of gear or which are impossible to put into gear and use.
Though the P0870 is diagnosed with an OBD-II scanner, one of the very first steps is to check the transmission before doing any other diagnostics as this may be the source of the code. The technician should also look at freeze frame determine when and where (in the order of events) the code was set. Once they check the transmission, they can reset the fault codes and test the vehicle to see if the code reappears.
The technician will use the scanner to diagnose any electrical issues with the system and examine the wiring, repairing and replacing components when needed. Unplugging the electrical connector and testing the sensor for voltage is also part of the process and if it is not in compliance, it may need to be replaced.
The P0870 code can cause many mistakes because it may lead to a technician feeling that the only problem is a transmission leak. This is why the first step is always to do a thorough diagnostic on the transmission to be sure that high temperatures have not damaged it internally. Only when the transmission has been assessed fully and repaired should the diagnostics on the sensor be performed.
The P0870 code is very serious because it can easily lead to the destruction of the transmission. Mistaking it for low fluid levels, rather than a full-blown leak is a common blunder. This code should not be taken lightly because it may mean a much costlier repair down the road.
To overcome and repair the P0870 code, a mechanic must:
Don't rush to replace the sensor when it could be a transmission leak. Also, be aware that control modules can fail, such as the PCM, but it is not a common reason for this code to appear.
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