P0731 on Dodge: How to Diagnose & Fix
Gear 1 Incorrect Ratio
1 Dodge model · 1 documented issue · 1 critical · $1,200-$2,600 repair
P0731 on Dodge by model: symptoms, diagnosis and fix
First-gen Neons with the optional 3-speed automatic (a TorqueFlite-family 31TH/A413 unit) are markedly less durable than the 5-speed manual. Documented failure points include a sticking governor valve (causes high-gear starts/binding), sprag/one-way-clutch failure, and clutch/band failures leading to slipping, harsh or missed shifts, dropping out of gear, and no-reverse conditions. Fluid neglect and the Neon's cooling/heat issues accelerate wear.
Common Symptoms
- Slipping or flaring shifts
- Harsh or skipped shifts
- Starts moving in high gear (sticking governor)
- No reverse / stuck in gear
- Drops out of gear at speed
- Whine or lockup then failure
How to Fix
Service with correct ATF and filter on a strict interval; a governor pressure/bracket-and-spring kit (e.g., Sonnax) addresses the sticking-governor high-gear-start complaint. Slipping/no-reverse or sprag failure typically requires a rebuild or replacement transmission. Adding an auxiliary cooler helps longevity.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Sonnax 32204-03K governor bracket/spring kit
Correct the sticking-governor/high-gear-start branch after diagnosis Fitment: Vendor explicitly lists 1995-2001 Neon 2.0L 3-speed A413/31TH Live direct US transmission-parts product page when checked
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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 Dodge?
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 Dodge it is documented across 1 model: Neon.
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 Dodge?
Published repair estimates on Dodge range from $1,200 to $2,600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0731 on a different make?
View P0731 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.