Powertrain, generic · Transmission

P07D9 Gear 8 Incorrect Ratio

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A ratio code compares input or turbine speed divided by output speed with the ratio of the commanded gear; a slipping clutch or the wrong gear trips it. Ford's summaries describe the check (over 30 rpm off for more than 1.8 s, three times) for gears 1–6 only; its 10-speed bulletins show gears 7–10 as P076F, P07D9, P07F6 and P07F7. P07D9 covers 8th gear. Ford's 10R80 (F-150, Mustang, Ranger, Expedition and others) and 10R140 (2020 Super Duty) list it in bulletins on harsh or delayed shifts, caused by adaptive learning, sticking valve-body valves or a migrating sleeve in a clutch cylinder. Nissan's nine-speed Frontier and Titan set it with the MIL on; a Stellantis bulletin pairs it with P0731 on low-mileage vehicles with wrong factory adaptives. Hyundai's eight-speeds and GM's 10-speed do not use it.

Likely causes

Clutch slipping or hydraulic leak (Ford 10R: migrating sleeve in the CDF clutch cylinder)
Shift adaptives wrong or not learned
Sticking valve in the valve body
Fluid level low or fluid degraded
Turbine or output speed sensor signal wrong

Symptoms

  • Slipping or flaring engine speed in gear 8
  • Harsh or delayed shifts
  • Check engine or transmission warning lamp
  • Gear 8 locked out, higher rpm at cruise

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–4,500
Time0–14 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission clutchestransmission valve bodytransmission fluidtransmission control module

Related codes

P076FP07F6P0730P07D7P07D8

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.