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P0852 is a diagnostic trouble code (DTC) for "Park / Neutral Switch Input 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The code P0852 indicates that a malfunction was detected within the park/neutral switch input circuit. This code is only found in vehicles with both automatic transmissions and four-wheel-drive capability.
The PCM uses data from the speed sensor, torque converter lock-up solenoid, the transfer case shift sensor, the transmission shift solenoids, and other sensors, to calculate engine RPM, engine timing, fuel delivery, and many other operations. If the data from these sensors indicate that the transmission shifter range is not falling within the set parameters, this code will be stored.
In almost every instance, the P0852 code is linked to a transfer case range sensor that is not properly adjusted. However, there may be other causes, including:
If the P0852 code is stored, the vehicle owner may observe several other symptoms, including:
To begin diagnosing the P0852 code, a mechanic must first verify the code with the OBD-II scanner. Then, they will visually inspect all the electrical components, and replace any faulty, open, shorted, or damaged elements. After this repair, and any others, they should clear the PCM and retest the system. This step ensures that the mechanic knows precisely which repair fixed the issue, and does not continue working on a vehicle that has been properly repaired. If the code returns after this step, the mechanic will move on to testing other components of the park/neutral switch until the issue has been discovered.
Often, after a vehicle has undergone recent transmission repairs, the range sensor will be left improperly adjusted, and only needs a simple tweak to solve the issue. Many technicians report that parts are mistakenly blamed and replaced when this small readjustment was all that was necessary.
The P0852 code directly relates to the safe and proper operation of the vehicle; therefore, it is very important that this issue be repaired immediately. Failure to address this issue when it arises could lead to dangerous driving conditions, or a vehicle that will not operate at all.
There are a few ways that a technician can address a P0852 code detection. They include:
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