P0733
UniversalThe Powertrain Control Module (PCM) detects that the actual gear ratio does not match the desired gear ratio for 3rd gear.
High SeverityThis code indicates that the vehicle's transmission is not achieving the correct gear ratio for 3rd gear, meaning the transmission is slipping or not engaging properly. This can lead to a noticeable loss of power, erratic shifting, or the vehicle going into 'limp mode'.
⚠️ Before You Begin (Safety First)
Driving with a P0733 code can be dangerous as it may lead to sudden loss of power or unpredictable shifting, increasing the risk of an accident. If you experience severe shifting issues, pull over safely. Never work on a hot engine or transmission. Ensure the vehicle is securely supported if lifting, and disconnect the battery before performing any electrical work.
Common Symptoms
- Check Engine Light illuminated
- Vehicle goes into "limp mode"
- Harsh or erratic shifting
- Transmission slipping
- Lack of power during acceleration
- Engine RPMs higher than normal for speed
- Vehicle stuck in a specific gear
Common Causes
- Low or contaminated transmission fluid
- Faulty transmission solenoid (shift solenoid or pressure control solenoid)
- Worn or damaged clutch packs/bands in the transmission
- Internal transmission mechanical failure (e.g., valve body issues, damaged planetary gear set)
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
- Clogged transmission filter
- Wiring issues or poor electrical connection to transmission components
Frequently reported on: 2000-2010 Ford F-150, 2000-2010 Chevrolet Silverado 1500, 2000-2010 Dodge Ram 1500, 2000-2010 Honda Accord, 2000-2010 Toyota Camry
Diagnostic Steps
- Check transmission fluid level and condition. Top off or replace if necessary.
- Inspect transmission wiring harness for damage or corrosion.
- Clear the code and test drive the vehicle to see if it returns.
- Consider replacing external transmission solenoids if easily accessible and diagnostics point to them.
- Consult a service manual for specific diagnostic procedures.
👨🔧 When to Call a Professional
If you lack specialized transmission diagnostic tools or experience with internal transmission components, it is highly recommended to consult a professional mechanic. Incorrect diagnosis or repair can lead to further, more costly damage to the transmission.
Commonly Asked Questions
What does "Gear 3 Incorrect Ratio" mean?
It means the transmission's 3rd gear is not engaging or maintaining the expected speed ratio between the input and output shafts, often indicating slipping or a control issue.
Can I drive my car with a P0733 code?
It is not recommended to drive for long periods. Continued driving can exacerbate transmission damage, potentially leading to a complete transmission failure.
Is P0733 always a sign of a bad transmission?
Not always. While it can indicate severe internal damage, it can also be caused by simpler issues like low/dirty fluid, a faulty shift solenoid, or wiring problems.
How much does it cost to fix a P0733 code?
Costs vary widely. A fluid change and solenoid replacement might be a few hundred dollars, while a transmission rebuild or replacement could cost several thousand dollars.
What's the first thing I should check if I get this code?
Always start by checking your transmission fluid level and condition. Low or dirty fluid is a common and easy-to-address cause.