P0731
Gear 1 Incorrect Ratio
P0731 is an OBD-II diagnostic trouble code meaning: Gear 1 Incorrect Ratio. Common causes: low or contaminated transmission fluid, worn or damaged friction discs. Estimated repair cost: $56–278.
Symptoms
- Incorrect gear shifting
- Delays when switching to first gear
- Power dips during acceleration
- Increased fuel consumption
- Check Engine Light Flashing
Causes
- Low or contaminated transmission fluid
- Worn or damaged friction discs
- Shift solenoids malfunction
- Problems with the hydraulic control unit
- Mechanical damage in the gearbox
How to Fix
- Check the level and condition of the transmission fluid
- Scan the transmission for additional trouble codes
- Check operation of shift solenoids
- Perform hydraulic pressure diagnostics
- If necessary, replace worn transmission components
Related codes
Error P0731 by Vehicle Brand
FAQ
What does the P0731 code mean?
P0731 is an OBD-II diagnostic trouble code that indicates: Gear 1 Incorrect Ratio
What causes a P0731 error code?
The most common causes of P0731 include: Low or contaminated transmission fluid; Worn or damaged friction discs; Shift solenoids malfunction; Problems with the hydraulic control unit.
How do I fix a P0731 diagnostic trouble code?
To fix P0731: Check the level and condition of the transmission fluid. Scan the transmission for additional trouble codes. Check operation of shift solenoids. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0731?
Do not drive — repair immediately
How much does it cost to fix P0731?
The estimated repair cost for P0731 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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