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P0854 is a diagnostic trouble code (DTC) for "Drive Switch Input Circuit Low". 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 P0854 code is a generic powertrain code related to the transmission, including pressure faults and sensor failures. In this case, the engine control module (ECM) is receiving a voltage signal from the drive switch input that is lower than allowed preset parameters.
Codes related to the P0854 include:
A P0854 code is stored when the ECM has detected a fault or malfunction in the drive switch input circuit. This code will only apply to vehicles equipped with four-wheel drive and an automatic transmission.
The drive switch is the device that tells the ECM which gear the transfer case is in, and most drive switches are of variable resistance. The switch is located over the transfer case shift shaft, and the shift lever will slide over it. When the shift lever is moved, the range sensor pivot hits different contacts. These contacts send the ECM voltage levels and helps it determine shift strategy and more.
The vehicle’s transfer case shift select range sensor sends data to the ECM, which utilizes the data to calculate engine timing and more. If the ECM is sent data from such sensors as the vehicle speed or transmission shift solenoids that shows the vehicle is lower than the correct transmission shifter range, the P0854 code can be stored.
Several problems may cause a P0854 code including:
Symptoms of a P0854 code may include:
A mechanic may use several methods to diagnose a P0854 trouble code, including:
At times, the transfer case range sensor may be incorrectly identified as the problem and replaced, when there may be a simple alignment adjustment that could solve the problem.
Because a vehicle’s safe driving operation may be impacted due to faults that store a P0854 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0854 trouble code and include:
It is recommended to always diagnose and repair trouble codes in the order in which they appear, especially when related to electrical wiring and sensor faults, as subsequent codes could be symptoms of a code higher up the list.
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