P0731 Code: Incorrect 1st Gear Ratio
Note: We do not currently have verified model-specific diagnostic data for the Dodge Ram. The symptoms and fixes listed below are the standard generic OBD2 guidelines for the P0731 code. Always consult a factory service manual before replacing parts.
What does this mean?
Code P0731 indicates the actual gear ratio does not match the expected ratio for 1st gear.
Diagnostic system: Transmission control and shift monitoring
On a Dodge Ram, the P0731 code should be diagnosed as part of the transmission control and shift monitoring group. Related codes and live data from this same system can change the repair priority, so avoid replacing parts from the code name alone.
Most Common Causes for Dodge Ram
- Low, dirty, or burnt transmission fluid
- Faulty transmission shift solenoid
- Worn or faulty transmission valve body
- Faulty torque converter or lockup clutch
- Clogged transmission filter
Symptoms to Watch For
- Check Engine Light is illuminated
- Transmission slipping between gears
- Hard or harsh gear shifting
- Transmission stuck in one gear
- Transmission hunting or cycling between gears
Before replacing parts, check these first
- Check fluid level and condition when the vehicle design allows it.
- Scan transmission module data, not only generic engine codes.
- Look for speed sensor, solenoid, and electrical codes before assuming internal transmission failure.
- Check for blown fuses, weak battery voltage, and damaged connectors before buying major parts.
How to Diagnose
Common Mistakes
Assuming the transmission needs rebuilding before checking fluid, sensors, solenoids, wiring, and control-module codes. Always confirm the fault with freeze-frame data, live data, visual inspection, and circuit checks before spending money on parts.
Frequently Asked Questions
Can I drive with the P0731 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0731 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0731 code, your Dodge will automatically fail an OBD2 plug-in emissions or smog test.
What should I check first for P0731?
Check fluid level and condition when the vehicle design allows it. Scan transmission module data, not only generic engine codes. Look for speed sensor, solenoid, and electrical codes before assuming internal transmission failure.
Join the Discussion
Repair Estimate
Fuse, connector, wiring, cleaning, or basic inspection
Internal transmission repair or module programming after electrical checks
Includes parts and labor. May vary by location.
Electrical repairs may be moderate; internal transmission repairs can be expensive and need professional confirmation.
DIY Difficulty
Can usually be performed at home with basic hand tools.