Nissan Altima P1777 Step Motor

What Does the P1777 Nissan Code Mean?

The P1777 Nissan code relates to the Step Motor Circuit in certain Nissan models, including the 2007-2008 Altima, Rogue, and Sentra. The Step Motor is responsible for adjusting the pulley ratio by turning coils on and off based on signals from the Transmission Control Module (TCM). When the Step Motor fails to respond to the TCM command, the Diagnostic Trouble Code (DTC) P1777 is triggered.

Possible Causes of the P1777 Nissan Code

The causes of the P1777 Nissan code may vary, and it’s essential to consider multiple factors. The potential culprits include:

  • Faulty Step Motor
  • Open or shorted Step Motor harness
  • Poor electrical connection in the Step Motor circuit

It’s important to note that this list may not be exhaustive, and there could be other underlying issues contributing to the code.

Diagnosing and Fixing the P1777 Nissan Code

A factory service bulletin has been issued for the 2007-2008 Nissan Altima, Rogue, and Sentra models with the P1777 code. The recommended solution involves replacing the transmission valve body.

User Experience: Addressing Persistent P1777 Code

A 2012 Nissan Altima owner faced persistent issues with the P1777 code, despite changing the Step Motor three times. The car would not go past 1,000 RPM.

Owner’s Experience:

  • Code Persistence: Despite changing the Step Motor three times, the P1777 code persisted.
  • RPM Limitation: The car was unable to go beyond 1,000 RPM.
  • Reset Attempts: The owner attempted to clear the code, but it consistently returned.

Troubleshooting Steps Taken:

  • Self-Repairs: The owner took on the task of fixing the issue independently.
  • Wiring Inspection: Ensured that the wiring from the transmission to the solenoids and Step Motor was intact.

Cost and Labor Information

Cost of Diagnosing P1777 Nissan Code

The cost to diagnose the P1777 Nissan code typically involves one hour of labor. However, actual costs can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops generally charge between $75 and $150 per hour for diagnosis.

Possible Symptoms of the P1777 Nissan Code

  • Engine Light ON (or Service Engine Soon Warning Light)

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