P0771 – OBD-II DTC

OBD-II DTC P0771 – Shift Solenoid D Stuck On

DTC P0771 meaning

DTC P0771 refers to a diagnostic trouble code indicating that the Shift Solenoid D is stuck in the “on” position. The shift solenoid is a critical component in the automatic transmission system, responsible for controlling the flow of transmission fluid to facilitate gear shifts. When the solenoid is stuck, it can lead to improper shifting and affect the overall performance of the vehicle.

DTC P0771 symptoms

Common symptoms associated with DTC P0771 may include:

• Delayed or harsh shifting between gears
• Transmission slipping or failing to engage
• Increased engine RPM without corresponding acceleration
• Check Engine Light illuminated on the dashboard
• Unusual noises from the transmission

DTC P0771 causes

Several factors can contribute to the occurrence of DTC P0771, including:

• Faulty shift solenoid D
• Wiring issues or short circuits in the solenoid circuit
• Low transmission fluid levels or contamination
• Faulty transmission control module (TCM)
• Mechanical issues within the transmission

DTC P0771 seriousness

DTC P0771 is considered a moderate to serious issue. If left unaddressed, it can lead to further transmission damage, reduced vehicle performance, and potential safety hazards while driving. It is advisable to diagnose and repair the issue promptly to avoid costly repairs and ensure safe operation of the vehicle.

How to diagnose DTC P0771

To diagnose DTC P0771, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0771 code.
2. Inspect the transmission fluid level and condition.
3. Check the wiring and connectors related to the shift solenoid D for damage or corrosion.
4. Test the shift solenoid D for proper operation using a multimeter.
5. Examine the transmission control module (TCM) for faults.
6. Perform a road test to observe shifting behavior and confirm symptoms.

How to fix DTC P0771 step-by-step instructions

To fix DTC P0771, follow these steps:

1. Address any low or contaminated transmission fluid by replacing it and ensuring proper levels.
2. Repair or replace any damaged wiring or connectors related to the shift solenoid D.
3. If the shift solenoid D is faulty, replace it with a new one.
4. Check and, if necessary, replace the transmission control module (TCM).
5. Clear the DTC using an OBD-II scanner and perform a test drive to ensure the issue is resolved.

How to erase DTC P0771

To erase DTC P0771, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the scanner’s menu and select the option to clear or erase trouble codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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