P0731 on RAM: How to Diagnose & Fix
Gear 1 Incorrect Ratio
1 RAM model · 1 documented issue
P0731 on RAM by model: symptoms, diagnosis and fix
Bulletin 21-055-24 addresses a 2021 5.7L eTorque/8HP75 software condition requiring a check-engine light and P0731. It also describes a severe 1–2 upshift bump at high engine rpm/low vehicle speed or inability to select the desired gear with steering-wheel controls. 2021 Ram 1500 DT with 5.7L EZL eTorque and 8HP75 transmission sales code DFR or DFV. The bulletin requires MIL illumination and P0731; it is not blanket 2019–2025 harsh-shift or torque-converter coverage.
How to Fix
Have a qualified technician confirm the engine/transmission codes, MIL and P0731 against 21-055-24 and diagnose other faults first. Reprogram the TCM with the latest software using the specified 13.2–13.5 V battery support, restart an interrupted flash as directed, and clear DTCs set by reprogramming. The bulletin does not prescribe a transmission, torque converter, module or fluid replacement. Normal warranty provisions apply; do not deliberately reproduce the high-rpm shift condition on public roads.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
P0731 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0731 mean on a RAM?
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 RAM it is documented across 1 model: 1500.
What are the most common causes of P0731?
The most common causes of P0731 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0731 on a RAM?
Repair costs vary widely with the root cause and RAM model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.