P0746 - Transmission Fluid Pressure Sensor Range/Performance Problem in Common Vehicles like Honda Accord and Toyota Camry

Quick Answer

P0746 means: P0746 indicates a malfunction in the transmission fluid pressure sensor, affecting shifting and performance.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0746? Immediate attention is recommended to avoid extensive transmission damage.

Common Questions

What does P0746 mean and how does it affect my car?

The P0746 code indicates a malfunction in your vehicle's transmission fluid pressure sensor, which is crucial for smooth shifting. If this sensor fails, it can result in erratic shifting behavior, poor acceleration, and even damage to the transmission over time. Addressing this issue promptly is important to maintain your car's performance and longevity.

What are the most common causes of P0746 and how much does it cost to fix?

Common causes of P0746 include a faulty transmission fluid pressure sensor, damaged wiring, or low transmission fluid levels. Repair costs can range from $150 to $300 for sensor replacement, $100 to $200 for wiring repairs, and $80 to $150 for a fluid change. It's important to diagnose the exact cause for an accurate estimate.

Can I drive my car with P0746 or should I stop immediately?

It's not advisable to continue driving if you see the P0746 code, as it can lead to more severe transmission issues. If you experience symptoms like harsh shifting or slipping, it's best to stop driving and have your vehicle inspected to avoid extensive damage.

How can I diagnose P0746 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a diagnostic scan to retrieve the P0746 code along with any related codes. Look for freeze frame data that shows the vehicle conditions when the code was triggered. You can also use the app to clear codes after repairs and monitor the vehicle's performance.

What vehicles are most commonly affected by P0746?

P0746 is commonly found in vehicles such as the Honda Accord (2003-2008), Toyota Camry (2007-2011), and various models from Nissan and Ford. Check for any recalls or Technical Service Bulletins (TSBs) related to transmission issues for these vehicles.

How can I prevent P0746 from happening again?

To prevent P0746 from recurring, ensure regular transmission fluid changes as per your vehicle's maintenance schedule. Regularly inspect wiring and connectors for wear and tear, and promptly address any leaks or low fluid levels.

What is P0746?

DTC P0746 indicates a problem with the transmission fluid pressure sensor or its circuit. This sensor plays a crucial role in monitoring the hydraulic pressure within the transmission, which impacts shifting performance and overall drivability. When the Engine Control Module (ECM) detects that the sensor's input is outside the expected range, it triggers the P0746 code. This issue is commonly found in vehicles such as the Honda Accord (2003-2008) and Toyota Camry (2007-2011). If not addressed, a P0746 code can lead to poor transmission performance, such as slipping, harsh shifting, or even complete transmission failure. Symptoms may include a check engine light, a lack of responsiveness during acceleration, or unusual noises from the transmission. Ignoring this code can result in more extensive damage, leading to costly repairs. Addressing P0746 promptly will help maintain optimal vehicle performance and reliability, ensuring a smoother driving experience.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0746 is present:

  • Check engine light stays on constantly, indicating an ongoing issue with the transmission system.
  • Engine hesitates during acceleration, leading to a sluggish or unresponsive driving experience.
  • Fuel economy decreased by 10-15%, which can increase your monthly fuel expenses significantly.
  • Rough or harsh shifting between gears, making driving uncomfortable and potentially damaging the transmission.
  • Unusual noise from the transmission, such as whining or grinding, which could indicate serious internal problems.

Possible Causes

Most common causes of P0746 (ordered by frequency):

  1. A faulty transmission fluid pressure sensor is the most common cause, accounting for about 60% of P0746 cases. If this sensor fails, it cannot provide accurate readings to the ECM, leading to incorrect pressure adjustments.
  2. Damaged wiring or connectors related to the transmission fluid pressure sensor can also trigger this code. Corrosion or fraying in the wiring can prevent proper electrical signals from reaching the ECM.
  3. Low transmission fluid levels due to leaks or poor maintenance can lead to incorrect pressure readings. Regularly check and maintain fluid levels to prevent this issue.
  4. Less common but serious causes include internal transmission damage, such as a failing valve body or pump, which can require extensive repairs.
  5. Rarely, software glitches in the ECM can falsely trigger the P0746 code, requiring a software update or reprogramming to resolve the issue.

P0746 Repair Costs

Cost Breakdown by Repair Type

Transmission Fluid Pressure Sensor Replacement

Replacing a faulty transmission fluid pressure sensor is a common solution.

  • Total: $150 - $300
  • Success rate: 80%
Wiring and Connector Repair

Repairing damaged wiring or connectors can resolve the issue.

  • Total: $100 - $200
  • Success rate: 70%
Transmission Fluid Change

Changing the transmission fluid can help if low fluid levels are an issue.

  • Total: $80 - $150
  • Success rate: 60%
Money-Saving Tips for P0746
  • 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 P0746 Diagnosis Process

Follow these systematic steps to accurately diagnose P0746. 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).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
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).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission fluid pressure sensor and its circuit (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission fluid pressure sensor and its circuit (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair success and ensure the code does not reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair success and ensure the code does not reappear (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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 Pressure Sensor Replacement in a 2006 Honda Accord

Vehicle: 2006 Honda Accord, 120,000 miles

Problem: Customer reported a check engine light and rough shifting.

Diagnosis: Diagnostic scan revealed P0746. Visual inspection found damaged wiring to the transmission fluid pressure sensor.

Solution: Replaced the faulty sensor and repaired wiring connections.

Cost: $250 (sensor: $150, labor: $100)

Result: Customer reported smooth shifting and improved performance post-repair.

Case Study 2: Fluid Change Resolves P0746 Code in a 2010 Toyota Camry

Vehicle: 2010 Toyota Camry, 90,000 miles

Problem: Check engine light illuminated, and the transmission was slipping.

Diagnosis: P0746 was identified during a scan; fluid levels were found to be low.

Solution: Performed a transmission fluid change and confirmed no leaks.

Cost: $120 (fluid: $80, labor: $40)

Result: The check engine light cleared, and the vehicle's performance improved significantly.

Diagnose P0746

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: P0746
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes