Guide To P0861 OBD Error Code Solutions

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What is a P0861 error code and what does it signify? There is a continuous conversation between the transmission control module and the PCM so that it meets the driver’s specified performance. When this communication is cut, the error code P0861 is stored.

The PCM will identify an error in the gear shift module communication circuit which sends data to PCM as well as other controllers as it helps to calculate engine RPM and timing, fuel delivery strategy and so on. Also, it’s applicable only to vehicles which have an electronic traction control system.

What causes this problem with the Gear Shift Control Module “A” Communication Circuit Low?

• Gear shift control module 'A' is damaged.
• Opening in the gear shift control module 'A'.
• Bad electrical connection in the gear shift control module 'A'.

1. Powertrain Control Module - Replacing a faulty PCM can help you to get rid of the P0861 error code.
2. Gear shift modules - Is the gear shift module faulty or defective? Replacing them immediately can help you to avoid P0861 error code in your vehicle.
3. Engine Traction Control Systems - The engine traction control system has to be defective free so that it can function normally without any troubles.
4. Transmission Wiring Harnesses - If there are any openings or cuts in your wire, they must be replaced as soon as possible.
5. Automotive Control Modules - Are you looking to fix this faulty component? Then Parts Avatar is the right place where you can find the replacement parts at affordable cost.
6. Speed Sensor Connectors - A broken or damaged speed sensor connector needs immediate fixation so as to avoid the P0861 error code.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0861 here:

Common Symptoms

• The hesitation of the engine to start.
• Improper transmission shift.

Want to correct the trouble code P0861? Read these points mentioned below:

• Replacing the faulty PCM.
• Defective gear shift modules should be fixed.
• The shorted or open wiring harness should be altered.
• Changing the damaged speed sensor connectors.

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best-priced PCM, gear shift module, engine traction control system, transmission wiring harness and a lot more to help you out in fixing your car.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0861 code to be stored:

• A successful diagnosis can be performed when it’s started with the help of a diagnostic scanner and DVOM.
• Inspect every wires and connector as it can be very helpful to know if there are any irregular connection which contributed to this code to be stored in the vehicle.
• Continue the process by clearing the codes and rechecking them for its appearance.
• This will eventually help you to know if there was a malfunction in the system.
• Clear the error codes again and test drive the vehicle to see if they reappear.
• You will know that there is an erratic condition if the code does not return immediately.
• This is a quite challenging task to perform and so you have to worsen this situation to proceed further with the diagnosis.
• Sometimes, it’s good to hand over to the professionals as there are many circuits involved.
• A skilled mechanic will use an Autohex – a specialized scanner in order to find out the malfunction in the system faster than a DVOM or a scanner.
• Every pin of the CAN bus must be separated and tested as it can be time-saving and cost-efficient.
• In case the PCM and other controllers lose their memory, a memory saving device must be installed and reprogrammed if needed.
• The CAN scanner which the mechanic uses will show the operations of the control module and pin values as it can properly monitor the circuit problems while the vehicle is operating, without any risk.
• If you come across any shorted, open or eroded wires and connectors, fix them as needed.
• Once the repair is done, retest the system to make sure it’s successful. If every of the component works in proper and normal condition, then connect a scanner to the diagnostic port and recover all codes and freeze frame data.
• You will need thousands of individual circuits to diagnose this error with the help of DVOM.
• If you misplace even one probe, then you may end up destroying the costly control modules where you have to reprogram the system. So you can do a continuity test by disconnecting the control modules which might approximately require 40 hours based on your vehicle.
• Begin the diagnosis by carefully inspecting all the circuits, connectors and wires as few of the applications use about 18 separate control modules.
• The battery ground must be checked for continuity along with the control module ground circuits.
• This type of error code frequently arises due to damaged or separated system grounds.
• If you have to check the differences of the system ground, then an auxiliary cable can be highly helpful.
• Hanging straps, transmission ground cables, and wires must be fixed once they are repaired.
• Error codes can be stored and the resistance can rise if there are any damaged or eroded electrical connectors. With the help of a DVOM, test the continuity between the connectors and individual controllers once you get the pin out value chart and the CAN bus system wire diagram.
• Fix the open or shorted circuits by comparing it with the manufacturer’s specified values.
• It is best to remove the damaged wires than trying to fix them among the complex wire circuits.

Common Mistakes When Diagnosing the P0861 Code

• Defective PCM.
• Faulty TCM.
• Problematic wires.