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DTC code page

P0733: Gear 3 Incorrect Ratio

Quick answer: The commanded third-gear ratio did not match the speed relationship the transmission controller measured.

Drivers also search this fault as gear 3 incorrect ratio, third gear incorrect ratio, 2-3 shift ratio error.

Severity: high Family: powertrain Related paths: 10
Meaning

What P0733 usually means

P0733 points the ratio problem into third gear, which often means the complaint becomes clearer under moderate acceleration or as the transmission settles into mid-range shifting. Drivers may describe a flare on the 2-3 shift, a delayed third-gear apply, or a unit that seems fine at takeoff but falls apart once speed builds. The core diagnostic split stays the same: prove the speed data first, then decide whether third-gear apply is genuinely weak because of line-pressure loss, valve-body wear, or internal clutch leakage.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Confirm whether the complaint centers on the 2-3 shift or moderate-speed acceleration rather than initial takeoff.
  • Check for speed-sensor or pressure-control codes that make a false ratio story more likely.
  • Note whether the problem worsens hot, because heat-sensitive hydraulic leakage often shows up there.
Driving risk

Can you keep driving?

P0733 can quickly turn a moderate-speed shift complaint into repeated slip and limp mode. Reduce driving, especially if the transmission flares every time it reaches the 2-3 shift.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Bad input or output speed data making third-gear ratio math unreliable
  • Hydraulic pressure loss during third-gear apply
  • Valve-body wear or sticking control components affecting the 2-3 shift
  • Internal third-gear clutch-pack leakage or wear
  • Overheated or degraded transmission fluid accelerating slip

Cause phrases often tied to this code: input speed sensor issue, output speed sensor issue, third clutch slip, valve body wear, line pressure loss.

Diagnostic order

Suggested workflow

  1. Use freeze-frame and road-test data to capture the shift where third gear should apply.
  2. Verify input and output speed data stays believable through the 2-3 shift event.
  3. Inspect fluid condition and any signs of overheating or delayed apply.
  4. If the data is good, move toward valve-body, pressure, and internal clutch diagnosis centered on third gear.
  5. Re-test after repair to confirm the 2-3 shift is clean and ratio math stabilizes.
Avoid guesswork

Common mistakes

  • Focusing only on the converter because the complaint appears at moderate road speed.
  • Skipping hot-road-test verification when the code appears mainly after warm-up.
  • Treating a gear-specific ratio code like a universal sensor problem without proving it.
Repair path

Practical fix guidance

  • Use P0733 to narrow the diagnostic window around third-gear apply instead of chasing the whole transmission blindly.
  • Correct false speed data first if the scan tool proves the math is being fed bad inputs.
  • If third-gear apply really is slipping, address the hydraulic or internal cause before converter and clutch debris spread.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0733

Useful when the driver knows the wording but not the exact DTC yet.

  • gear 3 incorrect ratio
  • third gear incorrect ratio
  • 2-3 shift ratio error
Related search intent

Queries this page can answer naturally

  • P0733 code meaning
  • what does P0733 mean
  • third gear incorrect ratio symptoms
  • 2-3 shift flare code
FAQ

Quick questions about P0733

What shift usually feels bad with P0733?

Many drivers notice it on the 2-3 shift or during moderate acceleration when third gear should apply cleanly.

Can heat make P0733 worse?

Yes. Hydraulic leakage and worn clutch elements often show themselves more clearly once the fluid is hot.

Should I suspect sensors or slip first?

Start by proving the speed data. If it is credible and the ratio is still wrong, real slip becomes much more likely.