P0733 code: Gear 3 Incorrect Ratio
P0733 means gear 3 Incorrect Ratio. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0733 means
P0733 sets when third gear fails the ratio check — commanded third, but the input/output speed math says it's slipping or didn't engage. The per-gear pattern applies: suspicion falls on the specific clutch pack that creates third and on the solenoid and valve-body passage that apply it, after the universal first check of fluid level and condition. Third is a workhorse mid-speed gear, so symptoms show up in the 25–45 mph range: flare on the 2-3 shift, a rubber-band feeling under acceleration, or the transmission skipping past third entirely. One useful pattern: if only P0733 is present, the fault is likely in third's own circuit; if several gear-ratio codes appear together, think systemic — pressure, pump, or fluid — instead of one clutch.
P0733 symptoms
- RPM flare or slip on the 2-3 shift
- Slipping or surging at mid speeds
- Transmission holds second or jumps to fourth
- Limp mode
- Check-engine light
What it costs to fix P0733
Varies by vehicle — get it diagnosed.
The repair cost for this code depends too much on your exact vehicle and the underlying cause to quote a meaningful range. Confirm the cause first so you only pay for the fix you actually need.
Diagnose P0733 for my vehicle →How to fix P0733
Advanced — usually a shop job unless you’re well equipped
- Count how many ratio codes are stored
If P0733 is the only gear code, the problem probably lives in third gear's own clutch or circuit. If two or more ratio codes are stored together, think about something every gear shares — low fluid, a weak pump, or pressure control — before focusing on third. Also look for speed-sensor codes, which can fake a ratio error.
- Inspect the fluid for level, color, and smell
Low fluid robs the clutch apply circuits of pressure, and third is often among the first to show it under moderate acceleration. Check the level with your transmission's specific procedure; fluid that's dark, burnt-smelling, or full of particles means the clutches have been overheating and makes a rebuild more likely.
- Reproduce the 2-3 slip and record it
Drive through the 2-3 shift at different throttle openings while logging commanded gear, input speed, and output speed. Slip that worsens with throttle and heat points at worn friction or a leaking seal, while a shift that sometimes skips third entirely suggests a solenoid or a valve in the valve body that isn't moving.
- Test the solenoid and pressure control for third
Using your transmission's shift chart, find which solenoids create third, check their resistance against spec, and command them with a bidirectional scan tool. If the unit has a line-pressure port, a gauge comparison between second and third shows whether third's circuit is losing pressure.
- Air-check the clutch circuit before overhauling
With the valve body removed, a shop can apply regulated air to third gear's apply passage: a solid clunk means the piston strokes, while hissing reveals worn sealing rings or piston seals. That test separates a seal leak from worn friction plates and keeps the rebuild targeted.
DIY or shop? The code count, fluid check, and data logging are tasks a capable owner can handle, and they keep a single-gear fault from turning into a blanket rebuild quote. Solenoid testing is reasonable with the right scan tool. Pressure testing, valve body removal, and air checks require specific tools and experience, and repairing third gear's clutch pack or sealing rings means removing the transmission — shop work, with an adaptive relearn at the end on most modern units.
Tools for the DIY steps: Bidirectional scan tool with data logging · Line pressure gauge set · Digital multimeter · Specified transmission fluid · Drain pan
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0733.
Start a case with P0733 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0733?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0733: common questions
Why does my car feel fine except around 30-40 mph?
That's third gear's territory. The other gears' clutches are healthy, so you may not notice anything until the transmission needs third — then you feel flare, surge, or a skip. Symptoms confined to one speed band are exactly why per-gear codes are so diagnostic.
Multiple gear ratio codes appeared together — what does that mean?
Several ratio codes at once point away from any single clutch and toward shared causes: low fluid, a tired pump, a clogged filter, or overall pressure loss. One code alone points at that gear's own clutch and solenoid. The pattern meaningfully changes the diagnosis.
Can a solenoid replacement fix P0733?
If testing shows the solenoid or its valve-body passage isn't delivering pressure, yes — and that's a far cheaper outcome than clutch work. If pressure is good and third still slips, the clutch pack itself is worn and the fix is internal.
Is it safe to drive to the shop?
That's not something the code alone can answer. A slipping gear wears the clutches faster with every mile, so get it inspected promptly. If the slip is pronounced, or the transmission bangs, shudders, or loses drive, stop driving and have it towed.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0733 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0733 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.