P0733: Gear 3 Incorrect Ratio

What does P0733 actually mean?

This narrows the general incorrect gear ratio fault down to third gear specifically not achieving its correct ratio when commanded.

The code sits in the transmission gear ratio area and is reported by the comprehensive component monitor. It names the circuit or the condition where the computer saw a reading outside its expected range. It does not name a failed part, and several genuinely different faults set this same code, which is the whole reason the causes below are ordered rather than listed.

What people usually notice

• Harsh or slipping shift into third gear
• Engine revs without matching road speed increase
• Flared shift feel at moderate speed
• Transmission warning light on

Why does P0733 set?

The causes below are ordered by how often they turn out to be the answer, cheapest and most common first. That order matters more than the list itself: the expensive component named in the code text is very rarely the first thing to replace, and working down from the top is what stops a transmission gear ratio fault becoming an expensive guess.

Low or degraded transmission fluid is the one to rule out before anything else. The most common and cheapest cause to check first.

The order worth checking on P0733

Start with freeze frame. Check the calculated ratio in third gear at the time the code set. That snapshot is taken at the instant the code set, and it is the single most useful piece of evidence you have, which is also why clearing the code before reading it is such a costly habit.

This code is diagnosed by watching values change rather than by reading the number again, so the tool has to stream live data and hold freeze frame. Live data on commanded versus calculated ratio in third gear specifically confirms the extent of the slip.

The order worth working in

• 1. Low or degraded transmission fluid: The most common and cheapest cause to check first.
• 2. Worn third gear clutch pack: Worn friction material cannot hold third gear ratio correctly.
• 3. Sticking shift solenoid for third gear: A solenoid that does not fully move affects that specific gear.
• 4. Valve body wear: Worn passages in the valve body can affect fluid delivery to that gear circuit.
• 5. General internal transmission wear: Least likely to be the first cause found, but possible with high mileage.

Is it safe to drive with P0733?

Slipping in third gear is most noticeable at moderate speeds, continuing to drive on it accelerates wear on that gear clutch pack.

This is a severity 3 of 4 code, which means continuing to drive normally risks damage that costs considerably more than the repair in front of you. Treat the lamp as an instruction rather than a notification.

What does it cost to ignore P0733?

Continuing to drive with a slipping third gear accelerates wear that can spread to other gears over time.

There is also the diagnostic cost of waiting. Freeze frame data, pending code history and the readiness monitor state all describe the fault as it was when it set, and all of it is lost the moment somebody clears the code to make the lamp go out.