P0786 OBD Error Code: Problem & Solutions

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The trouble code P0786 can be defined as Shift Timing Solenoid A Range/Performance. The major function of the solenoid is to control the automatic transmission fluid flow to help in shifting of the transmission. These solenoids are known as the electro-mechanical "pistons". There are a lot of shift timing solenoids included in the system.

We learn more by looking for the answer to a question. That’s the reason why we are here to provide you the answers for all your questions. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Shift Timing Solenoid A Range/Performance?

• There can be distorted TCM 
• The wiring harness might not be functioning properly
• Some issues related to the Pin/connector
• Imperfect ECM
• The ATF might be low
• Quirks in the automatic transmission fluid
• The shift timing solenoid might be damaged

1. Automatic Transmission Filter - The P0786 code can also arise due to some issues in Automatic Transmission Filter. So, it is advised to replace them as soon as possible.
2. Auto Transmission Shift Solenoid - Do you remember when was the last time you got your car Auto Transmission Shift Solenoid checked up? A damaged Auto Transmission Shift Solenoid can cause a lot of issues like displaying P0786 code.
3. Powertrain Control Module - Powertrain Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0786 code may start flashing.
4. Automatic Transmission Fluid - Is your Automatic Transmission Fluid damaged or broken? Don’t worry as we have solutions for all your problems.
5. Automatic Transmission Valve Body Kit - Defective car Automatic Transmission Valve Body Kit can be a major reason why P0786 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
6. Engine Wiring Harness - Everything is okay with the PCM and still OBD code P0786 triggering? Then there must be some defects in Engine Wiring Harness. Replace them as soon as possible.
7. Body Control Module Component - Body Control Module Component is an important auto part. Take care of it and you can rely on us to purchase best quality Body Control Module Component online.

Willing to know some common symptoms of OBD Trouble Code P0786? Your wish is our demand. Have a look at them below:

Common Symptoms

• Inconsistent shifting
• Faulty acceleration
• Decrease in the overall performance
• Transmission skipping
• Fastened in gears
• Unskilful shift timing
• Unsatisfactory driveability
• Rigid or grating shifting

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0786:

• Repair or replace the quirky transmission fluid
• Rehabilitate the defaults in the shift solenoids
• You must add transmission fluid
• Make sure to mend the faulty electrical components in the internal transmission
• It is essential to restore the flawed PCM
• Carefully adjust the faults in the hydraulic blockages

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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:

You will require some important things like a diagnostic scanner, a digital volt/ohmmeter, and a reliable vehicle information source to diagnose a code P0786. Check for technical service bulletins which pertain to the vehicle, symptoms, and codes.

Step 1

• You must change your fluid if it is grimy, smells burnt, overfilled and unusual colour.
• If you've owned your vehicle for 30,000 to 60,000 miles and you do not remember when was the last time you changed your fluid or have any records of it, not only may this be your issue, but you should follow your maintenance schedule to avoid this situation.
• Former fluid is mucky fluid, grimy fluid can cause blockages and blockages can be a big reason why this fault code is appearing so you must change your fluid!
• The manufacturers recommended steps should be followed properly when you are inspecting ATF.
• This basic step can differ a meaningful amount between the models as well as makes.

Step 2

• The fluid is in nice condition, code is still present and symptoms exist? It all depends upon your specific model; the shift solenoid may be accessible externally.
• Now if you find out that this is the case, then you should check the solenoid and its harness/connectors to find out the signs of defect.
• All the issues should be repaired or replaced as per the need. It would be helpful if you will have a peak for any leaks as well!
• If your shift solenoid is internal, then you should attempt to access it, work around it for now. Exhaust other avenues, internal transmission diagnosing and repairing should be left to a certified technician.
• The TCM and harness' involved in this circuit may be subject to rasping road conditions so make sure everything is complete in all aspects.

Step 3

• After that the shift timing solenoid should be inspected.
• You may be able to test the solenoid itself multiple ways.
• One test may include a resistance test where you use a multimeter to measure the resistance between the pins in the solenoid to verify to a degree its electrical integrity.
• Then the other would include manually applying voltage to the solenoid to verify its mechanical operation. You should specify either one in your manufacturers service manual/technical literature.

Step 4

• The circuit from the TCM should be tested properly.
• Then check the functionality of the sensor and its circuit by performing the same tests as above but from the pins at the TCM and/or ECM.
• This trick would be very helpful in verifying the integrity of the solenoid as well as electrical integrity.

Common Mistakes When Diagnosing The P0786 Code

• A lot of people fail to inspect the shift solenoid circuit and instead of that they replace shift solenoids. There might be some faults in the shift solenoid circuit due to which the trouble code is appearing.
• Make sure that you perform a proper inspection of all these components so that you do not face this issue.