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P1728 fault code: what it means

P1728: Ford code: transmission slip detected. Engine revs flare without the car speeding up.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. low or burnt fluid
  2. worn clutches or bands
  3. solenoid fault

P1728 by make

Ford

Ford code: transmission slip detected. Engine revs flare without the car speeding up.

Usual causes: low or burnt fluid; worn clutches or bands; solenoid fault

Mazda

Automatic transaxle clutch slippage detected. Gear is inhibited and line pressure maximised; check ATF level first.

Usual causes: low ATF level; worn or burnt clutch

Not sure what P1728 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.