P0733 on BMW: How to Diagnose & Fix
Gear 3 Incorrect Ratio
2 BMW models · 3 documented issues · 1 critical · $2,500-$8,000 repair
P0733 on BMW by model: symptoms, diagnosis and fix
The 7-speed M-DCT dual-clutch transmission in F87 M2 models can develop mechatronics unit failures, causing harsh shifting, failure to engage gears, or transmission fault warnings. The issue is related to the solenoid pack and hydraulic valve body within the mechatronics sleeve.
Common Symptoms
- Harsh or delayed shifts
- Transmission malfunction warning
- Failure to engage gear
- Grinding noise during shifts
- Limp mode activation
- Check engine light
- Jerking at low speeds
How to Fix
Replace or rebuild the mechatronics unit. In some cases, a transmission adaptation reset via ISTA can resolve early-stage symptoms. Severe cases require full mechatronics replacement, which involves dropping the transmission. Fluid change every 30k miles helps extend life.
Sources for this issue (1)
The Getrag DCT (dual-clutch transmission) in the M2 and M2 Competition experiences clutch pack wear from aggressive driving, launches, and track use. The DCT has two clutches (odd and even gears) that wear over time. Symptoms include shuddering during low-speed acceleration, rough shifting, and slipping under hard acceleration. Track use and repeated launch control engagements accelerate wear. DCT fluid degradation also contributes to poor shift quality. This transmission is shared with M3/M4 and has similar failure patterns.
Common Symptoms
- Shuddering or judder when accelerating from a stop
- Rough or harsh shifting between gears
- Slipping sensation under hard acceleration
- Burning smell from transmission
- Check engine light with transmission codes
- Clutch slip warnings on iDrive
How to Fix
Replace the DCT clutch pack ($5,000-8,000 parts and labor). Change DCT fluid every 30,000 miles with BMW-approved fluid to extend clutch life. Avoid excessive launch control use. Transmission adaptation reset via BMW software often improves shift quality temporarily. Some performance shops offer upgraded clutch packs for track use. Extended warranty coverage is highly recommended for DCT-equipped M2s.
Sources for this issue (1)
The Getrag DCT (dual-clutch transmission) in the M4 experiences clutch pack wear from aggressive driving, repeated launch control, and track use. The DCT has two clutches (odd and even gears) that wear over time. Symptoms include shuddering during low-speed acceleration, rough shifting, and slipping under hard acceleration. Track use and launch control dramatically accelerate wear. DCT fluid degradation also contributes to poor shift quality. Clutch replacement is expensive ($5,000-8,000) and considered a wear item on high-performance use.
Common Symptoms
- Shuddering or judder when accelerating from stop
- Rough or harsh shifting between gears
- Slipping sensation under hard acceleration
- Burning smell from transmission
- Check engine light with transmission codes
- Clutch slip warnings on iDrive display
How to Fix
Replace DCT clutch pack when symptoms appear. BMW recommends replacing all clutches together. Change DCT fluid every 30,000 miles with BMW-approved fluid to extend clutch life. Avoid excessive launch control use (limit to special occasions). Transmission adaptation reset via BMW software may temporarily improve shift quality. Extended warranty highly recommended for DCT-equipped M4s. Labor-intensive repair requires transmission removal.
Sources for this issue (1)
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 BMW?
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 BMW it is documented across 2 models: M2, M4.
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 BMW?
Published repair estimates on BMW range from $2,500 to $8,000 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.