P0731 on Nissan
Gear 1 Incorrect Ratio
P0731 on Nissan vehicles indicates gear 1 incorrect ratio. Au7o has documented this code across 1 Nissan model — most commonly on Titan. This code means the Transmission/Powertrain Control Module detected an incorrect gear ratio in 1st gear. The module compares input (engine/turbine) speed to output shaft speed; when the car is commanded into 1st but the calculated ratio doesn't match the expected value, P0731 sets. This points to slipping, an incorrect shift, or a hydraulic/mechanical problem rather than just an electrical fault. You may feel slipping, harsh or delayed engagement, or the transmission may go into a limited 'limp' mode. Typical repair costs on Nissan range from $250 to $6,500, depending on the specific model and root cause.
Common Causes of P0731
- •Low or degraded/burnt transmission fluid
- •Slipping clutch packs or worn friction components
- •Stuck or faulty shift solenoid affecting 1st gear
- •Internal hydraulic leak / valve body fault
- •Worn or failing torque converter
- •Faulty input or output speed sensor
- •Mechanical wear (planetary gears, bands) inside the transmission
P0731 on Nissan by Model
Nissan Titan(1 issue)
- 9-Speed Automatic Transmission Harsh Shifting, Hesitation, and Limp-Mode Behavior2020-2024
Multiple 2020-2024 Titan owners report rough 2-3 or 3-4 shifts, delayed engagement when selecting Drive or Reverse, shuddering under light throttle, and occasional reduced-power or fail-safe operation. Nissan issued technical service information for transmission control module and valve body related drivability concerns on trucks using the 9-speed automatic. Owners commonly describe the problem as intermittent at first, then more frequent as mileage accumulates or after towing and hot-weather use.
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What does P0731 mean on Nissan?▼
P0731 stands for "Gear 1 Incorrect Ratio." This code means the Transmission/Powertrain Control Module detected an incorrect gear ratio in 1st gear. The module compares input (engine/turbine) speed to output shaft speed; when the car is commanded into 1st but the calculated ratio doesn't match the expected value, P0731 sets. This points to slipping, an incorrect shift, or a hydraulic/mechanical problem rather than just an electrical fault. You may feel slipping, harsh or delayed engagement, or the transmission may go into a limited 'limp' mode. On Nissan specifically, this code is documented across 1 model.
What causes P0731 on Nissan vehicles?▼
Common causes on Nissan: Low or degraded/burnt transmission fluid, Slipping clutch packs or worn friction components, Stuck or faulty shift solenoid affecting 1st gear, Internal hydraulic leak / valve body fault, Worn or failing torque converter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0731 on a Nissan?▼
Repair costs on Nissan range from $250 to $6,500, depending on the specific model and root cause.
Which Nissan models have P0731 documented?▼
Au7o has documented P0731 on 1 Nissan model: Titan.