Quick Answer
P0733 means: DTC P0733 indicates an incorrect gear ratio in the transmission.
Can I drive with P0733? Immediate attention is recommended to prevent further damage.
Common Questions
What does P0733 mean and how does it affect my car?
DTC P0733 signifies that your vehicle's transmission is not shifting properly due to an incorrect gear ratio. This can lead to poor acceleration, diminished fuel efficiency, and eventually, severe transmission damage if left unchecked.
What are the most common causes of P0733 and how much does it cost to fix?
Common causes include a faulty transmission speed sensor, low fluid levels, or worn internal components. Repair costs can range from $100 for fluid changes to over $1,000 for TCM replacement, depending on the issue.
Can I drive my car with P0733 or should I stop immediately?
It is advisable to stop driving your vehicle if you see this code. Continuing to drive can exacerbate the problem, potentially leading to complete transmission failure.
How can I diagnose P0733 myself using GeekOBD APP?
Using the GeekOBD APP, you can check for the P0733 code and related freeze frame data. Look for any additional codes that may indicate the root cause, and use the app's live data feature to monitor the transmission parameters while driving.
What vehicles are most commonly affected by P0733?
Commonly affected vehicles include the 2007-2013 Honda Accord and the 2008-2016 Chevrolet Malibu, among others. Check for any recalls or Technical Service Bulletins (TSBs) related to transmission issues for your specific model.
How can I prevent P0733 from happening again?
To prevent P0733, ensure regular maintenance of your transmission system, including fluid changes every 30,000 to 60,000 miles, and promptly addressing any warning lights or unusual driving behavior.
What is P0733?
The Diagnostic Trouble Code (DTC) P0733 indicates that the Transmission Control Module (TCM) has detected an incorrect gear ratio in the transmission system. This is often observed in transmissions equipped with electronically controlled automatic systems. When the TCM identifies that the output speed does not correspond with the expected input speed based on the current gear selection, it triggers this code. In simpler terms, your vehicle's transmission is struggling to shift into the proper gear, which can lead to reduced fuel efficiency, poor acceleration, and potential long-term damage if not addressed promptly. Common vehicles affected by this issue include the 2007-2013 Honda Accord and the 2008-2016 Chevrolet Malibu, where drivers may experience symptoms like slipping gears, harsh shifting, or even stalling when the vehicle is in motion. Ignoring this code can lead to more severe transmission problems, necessitating costly repairs or complete transmission replacement. Therefore, it is crucial to act quickly if you see this code pop up on your dashboard, as it directly impacts your vehicle's performance and reliability.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0733 is present:
- The check engine light illuminates and remains on, indicating a persistent issue that requires diagnosis.
- Drivers report noticeable engine hesitation during acceleration, especially when shifting from first to second gear.
- Fuel economy may drop significantly, with reports of decreased efficiency by 10-15%.
- Some vehicles may experience harsh or erratic shifting, leading to a jarring driving feel.
- In severe cases, drivers may notice a complete loss of power while driving, which could pose a safety risk.
Possible Causes
Most common causes of P0733 (ordered by frequency):
- The most common cause of P0733 is a faulty transmission speed sensor, which is responsible for relaying the vehicle's speed to the TCM. This accounts for about 40% of cases.
- Another frequent cause is low transmission fluid levels, which can lead to poor lubrication and inadequate pressure in the transmission system. Regular fluid checks can prevent this.
- Worn or damaged internal transmission components, such as gears or clutches, can also trigger this code. Preventive maintenance and timely repairs are critical.
- Less commonly, an electrical issue, such as a short in the wiring harness, can interfere with the TCM's operation and lead to incorrect gear ratio readings.
- In rare instances, a failed TCM itself can be the culprit, which might require replacement if diagnosed as the source of the problem.
P0733 Repair Costs
Cost Breakdown by Repair Type
Transmission Fluid Change
Replacing old transmission fluid can resolve low fluid issues and improve transmission performance.
- Total: $100 - $200
- Success rate: 70%
Speed Sensor Replacement
Replacing a faulty speed sensor to restore proper functionality to the transmission system.
- Total: $150 - $300
- Success rate: 80%
TCM Replacement
In cases of a faulty TCM, replacing it can resolve the P0733 code and improve shifting issues.
- Total: $500 - $1,000
- Success rate: 90%
Money-Saving Tips for P0733
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0733 Diagnosis Process
Follow these systematic steps to accurately diagnose P0733. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components such as the speed sensor (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components such as the speed sensor (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Transmission Fluid Change Resolved P0733
Vehicle: 2010 Honda Accord with 95,000 miles
Problem: Customer reported check engine light and sluggish acceleration.
Diagnosis: After scanning, P0733 was found. Visual inspection showed low transmission fluid.
Solution: Performed a transmission fluid change and replaced the filter.
Cost: $150
Result: Customer reported improved acceleration and no check engine light after the repair.
Case Study 2: Faulty Speed Sensor Replacement
Vehicle: 2012 Chevrolet Malibu with 85,000 miles
Problem: Driver experienced harsh shifting and check engine light.
Diagnosis: P0733 was confirmed. Speed sensor was faulty upon testing.
Solution: Replaced the transmission speed sensor.
Cost: $250
Result: Shifting returned to normal, and no further codes were present after the repair.