P0733 - Gear 3 Incorrect Ratio
The P0733 code indicates that the powertrain control module (PCM) has detected an incorrect gear ratio when the transmission is commanded to shift into 3rd gear. This typically means the transmission is slipping or not engaging properly, often due to internal mechanical issues, low fluid, or solenoid problems.
01. Most Common Causes
- Low or contaminated transmission fluid
- Faulty shift solenoid
- Worn or damaged transmission clutches/bands
- Internal transmission mechanical failure
- Faulty transmission control module (TCM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission slipping out of 3rd gear
- Reduced fuel economy
- Transmission overheating
03. Step-by-Step Diagnosis
Step 1: Check transmission fluid level and condition; top off or replace if necessary.
Step 2: Scan for additional codes and inspect wiring/connectors to transmission solenoids.
Step 3: Perform a transmission pressure test to identify internal leaks or mechanical issues.
Step 4: Test shift solenoids and valve body operation; replace if faulty.
Step 5: If no external issues found, internal transmission inspection or rebuild may be required.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause further transmission damage. Limited driving to a repair shop is acceptable.
How much does it cost to fix?▼
Costs vary widely: fluid change $50-$150, solenoid replacement $150-$400, transmission rebuild $1500-$3500.