Powertrain, generic · Transmission

P076F Gear 7 Incorrect Ratio

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P076F means the ratio in seventh gear is wrong: input speed divided by output speed does not match the commanded gear, so a clutch slips or another gear is engaged. It only exists on transmissions with seven or more gears. Ford's 10-speed 10R80 and 10R140 list it in bulletins together with the other ratio codes and the check engine light – causes include a migrating sleeve on a clutch cylinder causing hydraulic leaks and sticking valve body valves. Ford's ratio check elsewhere flags more than 30 rpm off for 1.8 s three times. On GM's Corvette with seven-speed manual gearbox, P076F is a plausibility check of the gear position sensor instead (ratio window 0.41–0.50), after one trip.

Likely causes

Hydraulic leak at the seventh gear clutch (Ford 10R80: clutch cylinder sleeve)
Sticking valves in the valve body or solenoid
Fluid level or condition
Gear position sensor implausible or not learned (GM manual only)
Turbine or output speed sensor

Symptoms

  • Slipping or flaring engine speed in seventh gear
  • Harsh or delayed shifts
  • Check engine light, transmission warning, possibly limp mode

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–4,000
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

P0729P0730P07D9P073CP074F

References: static.nhtsa.gov, static.nhtsa.gov, gsi.ext.gm.com, gsi.ext.gm.com.