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P0766 fault code: what it means

P0766: Shift solenoid D performance or stuck off.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. sticking solenoid
  2. dirty fluid

P0766 by make

Isuzu

Shift solenoid D performance or stuck off.

Usual causes: sticking solenoid; dirty fluid

Toyota

Shift solenoid D (S4) performance on Toyota U151/AB60 automatics: the solenoid or valve is sticking. Harsh or wrong gear shifts.

Usual causes: sticking shift solenoid or valve body; dirty or old ATF; worn clutch packs

Not sure what P0766 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.