What Does P0733 Mean?
The TCM has detected that the actual gear ratio in 3rd gear does not match the expected ratio. The calculated ratio from the speed sensors deviates from the specification when 3rd gear is commanded. The driver may notice a flare during the 2-3 upshift, slipping sensation while cruising in 3rd gear, or the transmission skipping 3rd gear and shifting directly from 2nd to 4th.
Common Causes
35%
Worn 3rd gear clutch pack or direct clutch with reduced friction capacity
25%
Low or contaminated transmission fluid reducing 3rd gear clutch apply pressure
20%
Faulty shift solenoid or pressure control solenoid affecting 3rd gear hydraulic circuit
10%
Valve body issue — stuck 2-3 shift valve or leaking 3rd gear apply circuit
10%
Input or output shaft speed sensor error causing incorrect ratio calculation for 3rd gear
Diagnostic Steps
1
Verify transmission fluid level and condition. Correct any deficiencies before proceeding with further diagnosis.
2
Monitor ISS and OSS during a road test while the transmission shifts through all gears. Calculate the 3rd gear ratio and compare to the manufacturer's specification (typically 1.0–1.5:1).
3
Observe the 2-3 shift quality in live data — a normal shift should show RPM drop smoothly as 3rd gear engages. A flare or extended slip confirms clutch issues.
4
Test the shift solenoids responsible for 3rd gear engagement. Verify resistance, duty cycle response, and mechanical operation via scan tool commands.
5
Perform a pressure test at the 3rd gear (direct) clutch circuit. Low pressure indicates a hydraulic leak or solenoid issue; normal pressure with slipping means the clutch pack is worn.
6
Compare the ISS and OSS sensor readings to tachometer RPM and ABS wheel speed to rule out sensor inaccuracy as the cause.
Estimated Repair Cost
$150 - $3,500
Parts + labor, varies by vehicle and location
The TCM has detected that the actual gear ratio in 3rd gear does not match the expected ratio. The calculated ratio from the speed sensors deviates from the specification when 3rd gear is commanded. The driver may notice a flare during the 2-3 upshift, slipping sensation while cruising in 3rd gear, ...
The most common cause of P0733 (Gear 3 Incorrect ratio) is: Worn 3rd gear clutch pack or direct clutch with reduced friction capacity
Typical repair costs for P0733 range from $150 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
3rd gear slippage affects mid-range acceleration and cruising. The condition typically worsens under load or when the transmission is hot. Limit driving to short trips at moderate speeds and avoid towing or hill climbing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0733 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission / Gear Ratio Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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