P1777Manufacturer-specific code

P1777 Code: CVT Step Motor Circuit (Nissan)

On Nissan and Infiniti vehicles, the P1777 code means the computer found an electrical fault in the CVT step motor circuit. The transmission goes into limp mode. Other brands may define this number differently.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$200 to $2,500
Difficulty
Hard
System
Transmission
Applies to
Depends on the manufacturer

Common in: Nissan

Updated Reviewed by Renzo Chacca

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What the P1777 code means

P1777 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it means, not the generic SAE standard. The most widespread definition is the one used by Nissan and Infiniti. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1777
Nissan and InfinitiCVT step motor circuit

Nissan CVT transmissions change the ratio by moving the pulleys with a step motor. The transmission computer controls that motor and checks whether the actual ratio follows the command.

The computer sets the P1777 code when it detects an electrical fault in the step motor.

Before you start repairs, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1777 code symptoms

  • Very slow acceleration, or no change in ratio.
  • Limp mode.
  • Check engine light on.

Likely causes of the P1777 code

  1. Step motor connector. Check the lock tab, the pins and any sign of moisture or corrosion.
  2. Step motor. Confirm it with the tests in the diagnosis section.
  3. Wiring. Look for rubbing against the engine, the chassis or the exhaust.

How to diagnose the P1777 code step by step

  1. Inspect the transmission connector for moisture and loose pins.
  2. Measure the motor coils.
  3. Look up the technical service bulletins.

How to fix the P1777 code

  • Repair the connector.
  • Replace the step motor or the valve body.

Technical reference data

  • Resistance of each coil: about 30 ohms.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

Because this is an electrical code, check the connector and the coil resistance before you condemn anything inside the transmission.

P1777 on Nissan

Common on the Sentra, Tiida, Versa, X-Trail and Altima with a CVT.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives this code and confirm it with a compatible scan tool.

Frequently asked questions about P1777

What does the P1777 code mean on a Nissan?
It means there is an electrical fault in the CVT step motor circuit. The transmission goes into limp mode.
Does P1777 mean the same thing on every brand?
No. It is a manufacturer-specific code, so on other brands it may not exist or may mean something different. Confirm it with a scan tool that supports your make.
Can I drive with a P1777 code?
With caution. With a P1777 code the vehicle may not accelerate well, so be careful when merging and have it checked soon.
How much does it cost to fix P1777?
Roughly $200 to $2,500 on a Nissan. A connector repair is at the low end, while a new step motor or valve body costs far more.
Will a P1777 code clear itself?
Not while the step motor circuit is faulty. After a repair, clear the code and confirm the CVT changes ratio normally.
What is the most common cause of P1777?
A connector with moisture or corrosion, or a faulty step motor. Damaged wiring is the other thing to check.

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Questions about the P1777 code

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