P1778 fault code: what it means

P1778: CVT step motor function: actual pulley ratio does not follow what the TCM commanded. Older Jatco CVTs; usually a hydraulic valve body issue.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

CVT valve body fault (step motor is part of it)
low, dirty or wrong CVT fluid
worn pulleys or belt slipping
step motor wiring or connector

P1778 by make

Nissan

CVT step motor function: actual pulley ratio does not follow what the TCM commanded. Older Jatco CVTs; usually a hydraulic valve body issue.

Usual causes: CVT valve body fault (step motor is part of it); low, dirty or wrong CVT fluid; worn pulleys or belt slipping; step motor wiring or connector

What the repair usually costs

CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
CVT fluid service (car)NZ$250–NZ$580 · A$250–A$550
CVT fluid and filter service (SUV / Subaru / X-Trail)NZ$420–NZ$880 · A$400–A$830

Not sure what P1778 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.