P1778 — CVT Step Motor Mechanical Malfunction

CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.

What P1778 means

This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).

What P1778 means on specific makes

Nissan / Infiniti CAUTION

The CVT step motor is mechanically stuck/failed (not just an electrical fault like P1777). The variator can't change ratio properly — a known Nissan CVT failure point that can leave the car in limp mode.

  1. Failed/seized CVT step motor
  2. Valve body / variator damage
  3. Old or degraded CVT fluid

Check first: Confirm fluid level/condition, then internal CVT inspection; commonly a valve-body or CVT assembly job. Don't keep driving hard in limp mode.

Source: troublecodes.net/nissancodes

Related codes

P1777P0840
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