Gear 2 Incorrect Ratio

What it means

While second gear was commanded, the transmission computer found that the ratio between input and output speed does not match second gear. This usually shows up as an engine speed flare on the 1-2 shift, caused by a slipping clutch or band that applies second gear, or low pressure.

Related codes: P0730P0731P0733P0781P0755P0868

Symptoms4

• Sudden engine speed flare on the 1-2 shift.
• Delayed or harsh shift into second gear.
• Slipping feeling when accelerating at low speed.
• Check engine light on, possibly with the transmission in limp mode.

Possible causes5

• Low or degraded transmission fluid.
• A faulty shift or pressure control solenoid that controls second gear.
• A valve body fault or a leak in the second gear circuit.
• Worn clutch or band that applies second gear, depending on design.
• Damaged internal seals that hold pressure on this clutch.

How to diagnose5

1. Check the fluid level and condition.
2. Watch input and output speed during the 1-2 shift and note any engine speed flare.
3. Read solenoid and shift codes such as P0781, and test solenoid operation with a scan tool.
4. Note whether slipping gets worse with hot fluid.
5. Have a hydraulic pressure test done in second gear.

How to fix5

1. Correct the fluid level, or change the fluid and filter.
2. Replace the faulty solenoid.
3. Repair or replace the valve body.
4. Repair the clutch or band that applies second gear, along with its seals.
5. Clear the codes and confirm a smooth 1-2 shift on a road test.

The cost is low when fluid or a solenoid is the cause, and much higher when the transmission must be opened to repair the internal clutch or band.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions