P0733 on Kia: How to Diagnose & Fix
Gear 3 Incorrect Ratio
1 Kia model · 1 documented issue · $400-$1,800 repair
P0733 on Kia by model: symptoms, diagnosis and fix
The A6MF-family 6-speed automatic can develop harsh or erratic shifting, hard 6-to-4 kickdown 'bang,' shift flares, brief neutral feel during up/downshifts, and torque-converter clutch (TCC) shudder. The root cause is wear of the reducing-valve bores in the valve body, which lets line pressure drift out of spec; neglected fluid (SP4-spec) accelerates the wear. The internal wiring harness is also a known high-failure component on this transmission family, producing intermittent solenoid faults. This is a distinct transmission failure mode from the AWD rear-differential coupling noise already documented.
Common Symptoms
- Hard or jerky shifts
- 6-to-4 downshift bang/clunk
- RPM flare or neutral feeling between shifts
- Torque-converter shudder at light cruise
- Delayed engagement into Drive/Reverse
How to Fix
Start with a proper SP4-spec fluid service and a TCM software update if available. Persistent harsh shifting, gear-ratio or solenoid-performance codes are usually resolved by rebuilding or replacing the valve body (with the reducing valves/solenoids), and inspecting the internal harness for abrasion. In severe slip/shudder cases the torque converter is replaced.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Kia UM013-CH059 ATF Type 4(M) / SP-IV transmission fluidOEMKia UM013-CH059
Use only for a Kia-procedure fluid service after level, condition and transmission diagnosis Fitment/availability: 2017-2022 Kia Sportage QL six-speed automatic, both 2.4L GDI and 2.0L T-GDI; the current Kia guide lists total fill 7.1 qt…
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Sources for this issue (2)
P0733 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0733 mean on a Kia?
P0733 stands for "Gear 3 Incorrect Ratio." This code indicates the transmission control module found that the actual gear ratio in 3rd gear is outside the acceptable range for that gear. It is detected by comparing transmission input speed against output speed while 3rd gear is engaged. A mismatch typically signals the transmission is slipping in 3rd gear or that a control/hydraulic fault is preventing proper engagement. On Kia it is documented across 1 model: Sportage.
What are the most common causes of P0733?
The most common causes of P0733 are: Low or contaminated transmission fluid, Worn 3rd-gear clutch packs or bands, Failing shift solenoid for 3rd gear, Valve body or line pressure issues, Internal transmission mechanical wear, Restricted transmission filter, Faulty input or output speed sensor. The specific cause varies by vehicle.
How much does it cost to fix P0733 on a Kia?
Published repair estimates on Kia range from $400 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.