Error Code P0789: What It Means & What To Do?

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The trouble code P0789 can be described as Shift Timing Solenoid A Intermittent. If the P0789 trouble code is appearing, then it would mean that the PCM has found an unusual fault in the shift/time solenoid.

Error code P0789 flashing? Steer to our amazing website for a wide range of automobile parts and accessories. We won’t let you down in any way as for us our customers are everything. Visit us as fast as you can. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Shift Timing Solenoid A Intermittent?

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

1. 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 P0789 code may start flashing.
2. Automatic Transmission Fluid - Is your Automatic Transmission Fluid damaged or broken? Don’t worry as we have solutions for all your problems.
3. Automatic Transmission Valve Body Kit - Defective car Automatic Transmission Valve Body Kit can be a major reason why P0789 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
4. 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.
5. Automatic Transmission Filter - The P0789 code can also arise due to some issues in Automatic Transmission Filter. So, it is advised to replace them as soon as possible.
6. 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 P0789 code.
7. Engine Wiring Harness - Everything is okay with the PCM and still OBD code P0789 triggering? Then there must be some defects in Engine Wiring Harness. Replace them as soon as possible.

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0789. They are mentioned here as follows:

Common Symptoms

• Attached in gears
• Variable shifting
• Transmission gliding
• Grating shifting
• Unskilful shift timing
• Poor driveability
• Bad acceleration
• Diminishing performance

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 P0789:

• You must fix the defective transmission
• Make sure to mend the faulty wiring, connectors, or components
• It is essential to restore the flawed hydraulic pump
• Repair or replace the quirky shift solenoids, or solenoid packs
• Rehabilitate the defaults in the wiring connectors
• The malfunctioning PCM should be repaired or replaced as per the need
• Carefully repair the leaks

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Do you wish to diagnose P0789 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

• If you want to diagnose a code P0789, then you would need a diagnostic scanner, a digital volt/ohmmeter, and a reliable vehicle information source.
• The automatic transmission fluid should be checked.
• 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.
• 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.
• 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.
• 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 P0789 Code

A common mistake which is made by a lot of people is that they do not inspect the shift solenoid circuit first and they directly replace one or more shift solenoids.