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P1DA8 fault code: what it means

P1DA8: Incorrect gear ratio, clutch A, B or D defective (8-speed JL/JT). FCA D-clutch repair kit; slip on shifts or no reverse.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. failed D clutch
  2. clutch A/B wear
  3. low fluid
  4. valve body

P1DA8 by make

Jeep

Incorrect gear ratio, clutch A, B or D defective (8-speed JL/JT). FCA D-clutch repair kit; slip on shifts or no reverse.

Usual causes: failed D clutch; clutch A/B wear; low fluid; valve body

Not sure what P1DA8 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.