Quick Answer
P0747 means: P0747 indicates a problem with the torque converter clutch control circuit, affecting transmission performance.
Can I drive with P0747? Immediate attention is recommended to prevent further transmission damage.
Common Questions
What does P0747 mean and how does it affect my car?
P0747 signifies a malfunction in the torque converter clutch control circuit, which can lead to poor acceleration and decreased fuel efficiency. If ignored, it may result in serious transmission issues, requiring expensive repairs.
What are the most common causes of P0747 and how much does it cost to fix?
The most common causes include a faulty TCC solenoid, damaged wiring, or a malfunctioning ECM. Repair costs can range from $150 for wiring repairs to over $1200 for ECM replacement.
Can I drive my car with P0747 or should I stop immediately?
While it's possible to drive the vehicle, it is not advisable. Ignoring P0747 can lead to further transmission damage and compromised safety. It's best to have the issue diagnosed and repaired as soon as possible.
How can I diagnose P0747 myself using GeekOBD APP?
Using the GeekOBD APP, you can perform an OBD2 scan to retrieve DTCs and freeze frame data. Follow the app's instructions to check the TCC solenoid and monitor its performance under different driving conditions for a clearer diagnosis.
What vehicles are most commonly affected by P0747?
DTC P0747 commonly affects models such as the 2005-2010 Honda Accord and the 2006-2010 Toyota Camry, among others. Always check for any recalls or technical service bulletins related to your vehicle.
How can I prevent P0747 from happening again?
Regular maintenance, including fluid changes and inspections of the transmission system, can help prevent P0747. Ensure wiring is in good condition and replace any worn components promptly.
What is P0747?
DTC P0747 refers to a problem with the Torque Converter Clutch (TCC) control circuit. The TCC is a critical component within an automatic transmission, responsible for locking the engine and transmission together, improving fuel efficiency and performance. When this code appears, it generally indicates that the Engine Control Module (ECM) has detected a malfunction in the TCC control circuit. This could be due to a faulty solenoid, damaged wiring, or a malfunctioning ECM. In real-world terms, this means that your vehicle may experience poor acceleration, decreased fuel economy, or unusual engine behavior, such as slipping or stalling while driving. It's important to address this issue promptly, as a malfunctioning torque converter can lead to more severe transmission problems and costly repairs down the road. Common vehicles affected by this code include the 2005-2010 Honda Accord and 2006-2010 Toyota Camry, among others. If you find yourself facing this diagnostic trouble code, it's essential to seek professional help or use a diagnostic tool like the GeekOBD APP to get a clearer picture of the issue.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0747 is present:
- Check engine light remains illuminated, indicating a persistent issue that needs attention.
- Engine hesitates during acceleration, resulting in a lack of power and a sluggish driving experience.
- Fuel economy decreased by 10-15%, leading to increased fuel expenses and requiring more frequent fill-ups.
- Transmission slipping or jerking while changing gears, which can compromise safety and performance.
- Unusual engine noise while in gear, suggesting internal issues that could potentially worsen over time.
Possible Causes
Most common causes of P0747 (ordered by frequency):
- Faulty TCC solenoid (70% likelihood): This is the most common issue, where the solenoid fails to engage or disengage properly, impacting performance.
- Damaged wiring or connectors (15% likelihood): Worn-out wiring can lead to poor electrical connections, resulting in circuit failures.
- Malfunctioning ECM (10% likelihood): In rare cases, the engine control module may have internal faults that affect its ability to manage the TCC.
- Low transmission fluid (3% likelihood): Insufficient fluid levels can impede the TCC's ability to function correctly.
- Faulty transmission pump (2% likelihood): Though rare, a failing pump can lead to inadequate hydraulic pressure affecting the TCC operation.
P0747 Repair Costs
Cost Breakdown by Repair Type
TCC Solenoid Replacement
Replacing the faulty torque converter clutch solenoid to restore proper operation.
- Total: $200 - $400
- Success rate: 85%
Wiring Repairs
Repairing or replacing damaged wiring or connectors in the TCC circuit.
- Total: $150 - $300
- Success rate: 75%
ECM Replacement
Replacing the engine control module if it is determined to be faulty.
- Total: $800 - $1200
- Success rate: 90%
Money-Saving Tips for P0747
- 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 P0747 Diagnosis Process
Follow these systematic steps to accurately diagnose P0747. 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 to check the TCC solenoid and associated wiring for continuity and resistance (20-30 minutes)
Step 3: Component testing - Use a multimeter to check the TCC solenoid and associated wiring for continuity and resistance (20-30 minutes).
Step 4: Step 4: Fluid level check - Ensure that the transmission fluid is at the proper level and condition, addressing any leaks if necessary (10 minutes)
Step 4: Fluid level check - Ensure that the transmission fluid is at the proper level and condition, addressing any leaks if necessary (10 minutes).
Step 5: Step 5: System function test - After repairs, verify proper operation by clearing codes and testing the vehicle under various driving conditions (15-20 minutes)
Step 5: System function test - After repairs, verify proper operation by clearing codes and testing the vehicle under various driving conditions (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: Honda Accord P0747 Repair Case
Vehicle: 2010 Honda Accord, 85,000 miles
Problem: Customer reported engine hesitating during acceleration and check engine light on.
Diagnosis: Using the GeekOBD APP, we retrieved the P0747 code and found the TCC solenoid faulty after testing.
Solution: Replaced the TCC solenoid and performed a fluid change.
Cost: $350 (parts and labor included)
Result: The vehicle now accelerates smoothly, and the check engine light remains off.
Case Study 2: Toyota Camry P0747 Repair Case
Vehicle: 2008 Toyota Camry, 120,000 miles
Problem: Customer experienced transmission slipping and reduced fuel economy.
Diagnosis: Diagnostic testing revealed damaged wiring in the TCC circuit causing the P0747 code.
Solution: Repaired the wiring and replaced the TCC solenoid.
Cost: $450 (specific cost breakdown: $200 for parts, $250 for labor)
Result: Transmission performance improved significantly with no further codes present.