P0855 - OBD Trouble Code

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See the error code P0855 flashing? No worries! Here’s how you can solve and treat the error code P0855. The code sets in when an error has been detected in the drive switch input circuit by the PCM. The PCM receives data from the transfer case shift selector range sensor, which is further used to calculate the engine RPM, fuel delivery strategy, and engine timing amidst the other things. The code P0855 is strictly applicable to vehicles that have a four-wheel drive and an automatic transmission installed only.

It is observed that the engine computer (PCM) is permitted by the overdrive/tow switch to update the driver about if the vehicle is pulling anything so that the transmission can perform in accordance. The code P0855 is stored when the PCM receives an improbable signal from the switch.

What causes this problem with the Drive Switch Input Circuit high?

Till now a wrongly adjusted transfer case range sensor has been observed to be the primary cause. A damaged range sensor, open or short-circuited wirings or connectors are also basic causes that lead to a P0855 being stored. If the code fails to disappear even after the recent transmission repairs have been performed, a misadjusted range sensor should be suspected. It should be noted that a thread locking compound should be used to install sensor retaining bolts in order to ensure proper torque longevity. Presence of excessive corrosion in the sensor connector is also reported by the mechanics as being a significant cause.

1. Powertrain Control Module - Abbreviated PCM; this is an integral control unit. So, a defective one should be changed immediately.
2. Drive Switch - Having problems with the drive switch? Don’t you worry, Parts Avatar has it all. A faulty drive switch could end up being the root cause behind the error code P0855.
3. Shift Selector Range Sensor - A distorted shift selector range sensor can end up being the chief host inviting the error code P0855. So, replacing one can be one of the wisest decisions to avoid a problematic system.
4. RPM - In order to fix the troublesome error code P0855 its essential to fix the RPM. Fight your error code P0855 now.
5. Automatic Transmission Parts - Facing the error P0855? Well, get that fixed with a new automatic transmission parts available at Parts Avatar online at the economical prices.
6. Electrical Connectors - Weary and damaged connectors can often be problematic. So, to add some spark to your ride you definitely need the perfect quality electrical connectors offered at Parts Avatar. Isn’t that just the perfect deal?
7. Locking Compound - A locking compound should be mended or restored in order to fight back the complications caused by the error code P0855.

Willing to know some common symptoms of OBD Code P0855? Your wish is our demand. Have a look at them below:

Common Symptoms

It is observed that the symptoms may include a failure in the four-wheel drive engagement, extremely rough shifting, a complete failure to shift and a decreased fuel efficiency.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0855. They are mentioned here as follows:

• A misadjusted or a wrongly installed transfer case range sensor should be readjusted or replaced as required
• Replace or repair a defective range sensor. Sometimes the cause may also be a wrong fitting of the range sensor. It should be fixed too
• All the short circuited, open or corroded electrical wirings and connectors should be restored or mended
• Any corroded sensor connectors should be replaced or repaired

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• To begin with, a scanner (or code reader) along with a digital volt/ohmmeter should be used in order to successfully diagnose this code-storing condition. The drive switch performs the function of determining the (for the PCM) gear in which the transfer case is placed in.
• It should be noted that majority of the drive switches are of a variable resistance variety.
• The transfer case shift shaft has a switch located on it and the shift lever slides on over it
• The range sensor pivot moves to different contacts as the shift lever is moved (through the shift lever in the cockpit and the shifter cable)
• The different levels of voltage are read by the PCM and further regulated by the variating levels of resistance in the switch contacts as the gears in which the transfer case shifter is located
• Shift strategy, fuel delivery theory, engine ignition timing, and other drivability functions are determined by the PCM.
• The PCM receives transmission, ABS, and engine inputs, with the help of which it determines whether or not the transfer case is in the required gear for the driving conditions and so it reacts accordingly. A visual inspection of system wiring, connectors, and components should be performed
• Any open, shorted, damaged, or corroded electrical components should be changed or mended as per the requirements and retest the system in order to ensure that repairs were successful. If the system wiring, connectors, and components are observed to be in the specified working conditions, next, the scanner should be connected to the diagnostic connector and all the stored trouble codes and freeze frame data should be recorded.
• This information can be highly essential in diagnosing intermittent conditions that may have contributed to this code being stored.
• Next, the codes should be cleared, and the vehicle should be retested to see if the code reappears.
• You may have an intermittent condition, if the code fails to return immediately.
• It should be noted that it can often be quite challenging to diagnose the intermittent conditions and in extreme cases it may need to be allowed to worsen before an accurate diagnosis can be made.
• Check for the battery voltage and ground signals at the drive switch if the code returns back immediately.
• A digital volt/ohmmeter should be used if either the ground or battery voltage circuits are open to check for continuity (all related control modules should be disconnected from the circuit before checking circuit resistance or controller damage may occur) and resistance in both circuits
• The system circuits/connectors should be examined and replaced as per the requirements. One should always retest the system in order to confirm that if the repairs were successful. Disconnect the electrical connectors to all related controllers carefully.
• It is advised to refer to the manufacturer’s wiring diagram for the drive switch. A test should be conducted of all the related circuits and the sensor for resistance and continuity. The findings should be compared with manufacturer’s specifications.
• The system circuitry, connectors, and/or components that fail to collate with manufacturer’s specs may need to undergo replacements and repairs as per needs.
• A lastly, the system should be retested to confirm a successful repair. A damaged PCM should be suspected if all the circuits match with manufacturer’s specifications.
• It should be noted that a PCM failure is rare to happen and therefore replacement would require reprogramming.