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P0848 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor/Switch B Circuit High". 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The storage of a P0848 trouble code means that the powertrain control module (PCM) has detected a problem with the transmission fluid sensor circuit. The pressure to the hydraulic pump is controlled by the PCM via the electronic pressure control solenoids. Some of the other trouble codes a mechanic might also see include P0845, P0846, P0847, and P0849.
A P0848 trouble code signifies that there is a discrepancy in the pressure produced as opposed to what is actually needed by the transmission to function properly. The transmission needs the proper amount of pressure to shift properly and for the torque converter to engage and disengage like it should.
Some common causes of a P0848 trouble code include a faulty transmission fluid pressure sensor, bad electronic pressure control solenoid, and blockage within the hydraulic lines of the transmission. Mechanical failure of the transmission can also lead to the storage of this code by the PCM. Mechanical failure can result from a low fluid condition or dirty and contaminated fluid within the transmission. A low fluid condition or dirty transmission fluid can also cause the PCM to store the trouble code. Though rare, another culprit could be the PCM itself.
In addition to showing no obvious symptoms of a problem at all, other than a lit Check Engine light, when storing a P0848 trouble code, the torque converter in the vehicle could fail to work properly, there could be problems with shifting, and the transmission could overheat. Other symptoms include a reduction in the fuel efficiency of the vehicle and the PCM placing the transmission into Limp-in mode.
To properly diagnose a P0848 trouble code, a mechanic needs a code reader, digital volt/ohmmeter, manual pressure gauge, hydraulic pressure diagram, and the manufacturer's wiring diagram for the transmission fluid pressure sensor. The mechanic must also perform the following steps:
A common mistake when diagnosing a P0848 trouble code is for the mechanic to overlook a faulty transmission fluid pressure sensor, electronic pressure control solenoid, or damaged wiring as the cause of the code and assuming it was stored in conjunction to a faulty high pressure pump when the pump is not the problem. Replacing the pump does not fix the problem and results in the trouble code returning.
Failure to repair a P0848 trouble code can result in no apparent problems with the vehicle to a complete failure of the transmission. Other problems vehicle owners can encounter when leaving a P0848 trouble code unfixed include problems shifting, slipping of the transmission, and the transmission becoming overheated.
To repair a P0848 trouble code, the mechanic should perform the following:
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