P0928 Shift Lock Solenoid/Drive Control "A" Circuit/Open

P0928 – OBD-II Trouble Code Technical Description

Shift Lock Solenoid Valve Control Circuit/Open

What does the fault code mean P0928?

To prevent unexpected rolling situations, modern vehicles are equipped with a shift lock solenoid. Trouble code P0928 indicates a problem in the control circuit of this solenoid. Determination characteristics, troubleshooting steps, and repairs may vary depending on the vehicle brand. The transmission control module monitors the solenoid and if it is not within the parameters set by the manufacturer, a P0928 trouble code will be set. Code P0928 is common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot and Volkswagen vehicles.

Possible reasons

Possible causes for a problem with the shift lock solenoid/drive "A" control circuit being open/open:

• Shift lock solenoid malfunction.
• Open or shorted wire in the shift lock solenoid harness.
• Imperfect electrical contact in the shift lock solenoid circuit.

Possible causes of the malfunction:

• Transmission fluid level is low or contaminated.
• Low battery voltage.
• Damaged fuses or fuses.
• Damaged wiring or connectors.
• Failure of the gear shift lock solenoid.
• Failure of the brake light switch.

What are the symptoms of a fault code? P0928?

Trouble code P0928 indicates a problem with the shift lock solenoid control circuit. Some of the symptoms that may be associated with this problem include:

1. Difficulty or inability to change gears.
2. Problems with shifting the gearbox from park mode.
3. Errors or problems with the gearbox indicator on the instrument panel.
4. The appearance of errors in the engine or gearbox control system.

If you experience these symptoms, it is recommended that you contact a certified mechanic to diagnose and repair the problem.

How to diagnose a fault code P0928?

OBD trouble code P0928 usually indicates a problem with the shift lock solenoid control circuit. When this error occurs, you may experience the following symptoms:

• Difficulty or inability to change gears.
• Problems with shifting the gearbox from park mode.
• Errors or problems with the gearbox indicator on the instrument panel.

The following steps are recommended to diagnose this problem:

1. Check the shift lock solenoid control circuit for an open or short.
2. Check the condition and electrical contact of the shift lock solenoid.
3. Check the level and condition of the transmission fluid.
4. Check the operation of the brake light switch.

If such symptoms occur, it is recommended to contact a qualified specialist for a more accurate diagnosis and elimination of the problem.

Diagnostic errors

When diagnosing car problems, various errors can occur that affect the accuracy and efficiency of the process. Some of the most common car diagnostic errors include:

1. Misinterpretation of error codes: Some mechanics may misinterpret error codes, which can lead to misdiagnosis and replacement of unnecessary components.
2. Incomplete testing: Skipping important tests or checks may result in an underdiagnosed problem.
3. Lack of attention to detail: Ignoring small details or not taking into account specific conditions can lead to incorrect conclusions about the causes of the problem.
4. Improper Use of Equipment: Improper use of diagnostic equipment may result in incorrect or inaccurate results.
5. Neglecting a test drive: Insufficient or no test drives can lead to an incomplete assessment of the problem, especially when diagnosing engine or transmission problems.

To avoid these mistakes, it is important to follow the diagnostic process, carefully check every part, use the correct equipment, and conduct a full test drive to confirm the diagnosis. When in doubt, it is always best to consult an experienced auto mechanic or diagnostic specialist.

How serious is the fault code? P0928?

Trouble code P0928 indicates a problem with the shift lock solenoid control circuit. Although this may cause some inconvenience in using the vehicle, this problem is usually not a safety concern and can be resolved relatively easily in most cases.

However, a faulty shift lock solenoid can result in difficulty shifting, which can be frustrating for the driver. If the problem is not addressed promptly, it can lead to poor transmission performance and increased wear on some of its components.

Although the P0928 code is not a safety critical code, it is recommended that you consult an auto mechanic or diagnostic specialist to resolve this issue as soon as possible and avoid further transmission problems.

What repair will help eliminate the code? P0928?

Troubleshooting a P0928 trouble code related to shift lock solenoid problems typically requires several steps:

1. Control Circuit Test: The first step is to diagnose and test the shift lock solenoid control circuit for opens, shorts, or poor electrical connections. If problems are found with wiring or electrical components, they may need to be replaced or repaired.
2. Checking Transmission Fluid Level and Condition: Low or contaminated transmission fluid can also cause problems with the lockup solenoid. Check the level and condition of the fluid, and if necessary, replace or add fluid.
3. Brake Light Switch Test: A damaged or faulty brake light switch can also cause P0928. Check its functionality and, if necessary, replace it.
4. Replacing or Repairing the Shift Lock Solenoid: If all of the above steps do not resolve the problem, the shift lock solenoid itself may need to be replaced or repaired.

It is recommended that you contact a qualified technician or mechanic for detailed diagnosis and repair to ensure that the P0928 code is effectively resolved and possible further transmission problems are prevented.

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