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P0733 almost always means 3rd-gear clutch wear. When the TCM commands 3rd gear but the input/output ratio is wrong, clutches are slipping. Driving with this code rapidly destroys the trans. Tow it - do not test-drive long distances. Rebuild kits on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0733 fault localized to the transmission control system / solenoid body
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0733 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
70%
#1 - Most Likely
Worn 3rd Gear Clutch Pack
The friction discs in the 3rd gear clutch pack are worn beyond service limit and slipping. Internal repair only - rebuild or replacement is the only fix. Catching it early may save the rest of the trans.
🔩 Part
$120–$500
👨🔧 Labor
$1,800–$3,500
⚡ DIY Difficulty
Hard
20%
#2 - Check First
Failed Pressure Control Solenoid
A weak or stuck pressure solenoid is failing to apply enough hydraulic pressure to the 3rd gear clutch, causing slip. Sometimes repairable for a few hundred dollars without a full rebuild.
🔩 Part
$80–$300
👨🔧 Labor
$300–$700
⚡ DIY Difficulty
Hard
10%
#3 - Less Common
Low Fluid / Wrong Fluid
Insufficient ATF or use of incorrect fluid spec causes 3rd gear slip. Verify fluid level cold and warm; a fluid change with the correct spec sometimes recovers minor cases. Major slip is permanent.
🔩 Part
$30–$80
👨🔧 Labor
$80–$200
⚡ DIY Difficulty
Easy
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Verify with a road test in 3rd gear - Engine RPM rising without matching road speed in 3rd gear confirms clutch slip. Stop driving immediately if confirmed - further driving destroys the rest of the trans.
- Inspect ATF for color and burn smell - Burned, dark, or strong-smelling fluid confirms clutch material breakdown. A fluid change won't fix it but may delay total failure for a few weeks.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need