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What is the solution for Nissan P1777 trouble code?

2 Answers

Diane

07/29/25 7:28pm

If the pressure solenoid valve is stuck in the closed position or the solenoid valve itself is faulty, you can remove the solenoid valve for cleaning. If that doesn't work, replacement is the only option. Below are specific details about automotive trouble codes: Introduction: Automotive trouble codes are codes generated by the vehicle's ECU (Engine Control Unit) after analyzing faults when issues occur. Generally, these codes indicate sensor malfunctions or poor sensor performance, but some mechanical faults cannot be read by the ECU. When a car engine develops a problem, a diagnostic tool will display the trouble code, allowing mechanics to accurately identify the faulty component for repair. Function: Trouble codes are essential conditions checked in the control logic to determine whether certain functions meet control requirements. If conditions are not met, the function may be canceled or restricted, with a prompt to the driver. For critical signals, a backup signal may be provided as a substitute while the function is restricted. In summary, these codes provide the basis for normal control unit operations.

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StDallas

08/14/25 2:20pm

The other day I was driving on the highway when suddenly the P1777 trouble code popped up on the dashboard, which really freaked me out. After checking, I learned this usually indicates an issue with the step motor in Nissan transmissions – could be a short circuit or burnt-out motor. I did a quick self-check: battery voltage normal? No loose connections? But it didn't help. Later I rushed to a professional repair shop where the mechanic confirmed the step motor needed replacement and cleaned the wiring connectors too. The whole repair cost around 1,000 RMB, but the car runs smoothly now. My advice: avoid aggressive driving – sudden acceleration damages transmissions, and regular shop checkups can prevent major issues. The problem got resolved relatively quickly, though it wasted half a day. Just glad nothing worse happened on the road – that would've been way more troublesome.

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