Skip the auto shop - Our mechanics make house calls

Q: Code P1778.

asked by on

failed smog data code P1778, open or short circuit condition, poor electrical connection, failed cvt unit code p1778 check engine lights

My car has 216332 miles.
My car has an automatic transmission. 2004 nissan murano sl

Hello P1778 is the code for an issue with the stepper motor function. The CVT transmission on this vehicle uses a 4 position stepper motor to propel the vehicle. If the stepper motor goes bad, or has an issue it will set off the check engine light to notify the driver of the issue. Common causes for this are faults with transmission speed senors, with the stepper motor, with the CVT transmission itself, or the wiring to these components. In more serious cases a P1778 code can signal the need for a replacement CVT transmission. I would recommend having a professional technician, such as one from YourMechanic, come to your location to determine the cause of the trouble code, and what repairs should be made](https://www.yourmechanic.com/services/check-engine-light-is-on-inspection).

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: intermittent speakers

Hi there. In most cases, when the speakers randomly cut off it's due to a loose electrical connection from the stereo or the speakers themselves. You might to check the electrical connections behind the dash or the speakers first. If...

Q: While I was driving, the vehicle will not drive and while I hit the gas it will just revv not move.

If the vehicle is in gear and acceleration of the engine does not produce forward movement, there is likely something wrong with the transmission and/or the torque converter. The origin of the fault could be electrical or mechanical. There is...

Q: My A/C delays coming on.

Hello there. This is a common fault. There are a few potential causes for this, but the most likely are a clogged cabin filter, failing blower motor, blend motor actuator or a mode selector failure. If you want to have...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.