Gear 1 Incorrect Ratio

What it means

While first gear was commanded, the transmission computer calculated the ratio between input and output speed and found it does not match first gear. This usually means slipping in the clutches that apply first gear, or not enough hydraulic pressure on takeoff.

Related codes: P0730P0732P0750P0781P0868P0715

Symptoms4

• Weak takeoff from a stop with engine speed flaring.
• Delayed engagement when shifting into drive.
• Vehicle starting off in second gear in limp mode on some models.
• Check engine light on.

Possible causes5

• Low or degraded transmission fluid.
• Clogged filter or weak pump, often showing first on takeoff with hot fluid.
• A faulty solenoid that controls first gear.
• A valve body fault or a leak in its hydraulic circuits.
• Worn clutches or the one-way clutch used in first gear, depending on design.

How to diagnose5

1. Check the fluid level and condition, and look for friction material.
2. Watch input and output speed in first gear on takeoff and compare the ratio with the transmission specification.
3. Note whether slipping gets worse as the fluid warms up, which suggests low pressure or an internal leak.
4. Check for solenoid codes, and test solenoid resistance and operation with a scan tool.
5. Have a hydraulic pressure test done in first 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 clutches or one-way clutch that apply first gear.
5. Clear the codes and confirm a normal takeoff with no slipping on a road test.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low when fluid or a solenoid is the cause, and much higher when the clutches need repair or the transmission must be rebuilt.

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