P0773 - Transmission Fluid Pressure Sensor Range/Performance Problem in Popular Models Like Ford and GM

Quick Answer

P0773 means: P0773 indicates a problem with the transmission fluid pressure sensor's range or performance.

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

Can I drive with P0773? Immediate attention is recommended to avoid further transmission damage.

Common Questions

What does P0773 mean and how does it affect my car?

The P0773 code indicates an issue with the transmission fluid pressure sensor or switch. This can lead to erratic shifting, reduced fuel economy, and potential transmission failure if not addressed. It’s crucial to diagnose and repair this issue promptly to maintain vehicle performance.

What are the most common causes of P0773 and how much does it cost to fix?

Common causes include a faulty transmission fluid pressure sensor, wiring issues, and low transmission fluid. Repair costs can range from $150 to $300 for sensor replacement, and around $100 to $250 for wiring repairs.

Can I drive my car with P0773 or should I stop immediately?

Driving with a P0773 code can be risky. If you notice symptoms like rough shifting or decreased acceleration, it's best to stop driving and have the issue diagnosed to prevent further damage to the transmission.

How can I diagnose P0773 myself using GeekOBD APP?

You can use the GeekOBD APP to perform an OBD2 scan to retrieve the P0773 code. Check for freeze frame data to understand when the issue occurred and perform a visual inspection of the transmission wiring and connections.

What vehicles are most commonly affected by P0773?

Vehicles from Ford, Chevrolet, and GMC, particularly models from 2005 to 2018, frequently experience the P0773 code due to similar transmission designs and components.

How can I prevent P0773 from happening again?

Regularly check and maintain your transmission fluid levels, and have your vehicle inspected for electrical issues during routine maintenance to help prevent future occurrences of the P0773 code.

What is P0773?

The diagnostic trouble code P0773 indicates a problem with the transmission fluid pressure sensor or switch, particularly in its range or performance. This code often arises when the powertrain control module (PCM) detects an abnormal reading from the transmission fluid pressure sensor, which is responsible for monitoring the hydraulic pressure within the transmission. When the PCM notices that the sensor's output is outside the expected range, it triggers this code. This issue is typically associated with automatic transmission systems in various vehicles, including models from Ford, Chevrolet, and GMC, particularly those manufactured between 2005 and 2018. If left unaddressed, problems related to P0773 can lead to erratic shifting, reduced fuel efficiency, and even complete transmission failure, which can be costly to repair. Owners should pay close attention to any symptoms indicating transmission issues, as they may point to the underlying problem associated with this code. In some cases, the issue may be as simple as a faulty sensor, while in others, it could indicate more serious transmission problems requiring professional diagnosis and repair. Understanding the implications of P0773 is essential for maintaining your vehicle's performance and avoiding costly repairs in the future.

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

Symptoms

Common symptoms when P0773 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the transmission system.
  • Engine hesitates during acceleration, which can lead to a lack of power when merging onto highways or overtaking.
  • Fuel economy decreased by 10-15%, as the vehicle struggles to shift properly, leading to higher fuel consumption.
  • Rough shifting or slipping between gears, causing a jerky or unpredictable driving experience.
  • Unusual noises from the transmission, such as grinding or whining, which may signify internal damage.

Possible Causes

Most common causes of P0773 (ordered by frequency):

  1. Faulty transmission fluid pressure sensor (70% likelihood) - The most common cause of P0773 is a malfunctioning sensor that fails to send accurate pressure readings to the PCM.
  2. Wiring issues (15%) - Damaged or corroded wiring connections leading to poor electrical signals can trigger this code.
  3. Transmission fluid issues (10%) - Low or contaminated transmission fluid may affect pressure levels and sensor performance.
  4. Faulty PCM (3%) - In rare cases, the vehicle's PCM may be defective and misinterpret sensor readings.
  5. Mechanical transmission problems (2%) - Internal transmission issues can lead to pressure discrepancies and trigger the P0773 code.

P0773 Repair Costs

Cost Breakdown by Repair Type

Transmission Fluid Pressure Sensor Replacement

Replacing the faulty transmission fluid pressure sensor to restore proper function.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair or Replacement

Repairing or replacing damaged wiring or connectors affecting the sensor's function.

  • Total: $100 - $250
  • Success rate: 80%
Money-Saving Tips for P0773
  • 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 P0773 Diagnosis Process

Follow these systematic steps to accurately diagnose P0773. 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 wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission fluid pressure sensor and wiring (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 repair success and ensure the check engine light does not reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the check engine light 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: Ford F-150 P0773 Repair Case

Vehicle: 2015 Ford F-150, 75,000 miles

Problem: Customer complained of rough shifting and intermittent check engine light.

Diagnosis: After running a diagnostic with the GeekOBD APP, the P0773 code was retrieved along with freeze frame data showing erratic sensor readings.

Solution: Replaced the faulty transmission fluid pressure sensor and topped off the transmission fluid.

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

Result: Customer reported smooth shifting and no more check engine light after repair.

Case Study 2: Chevrolet Silverado Transmission Issue

Vehicle: 2017 Chevrolet Silverado 1500, 60,000 miles

Problem: Owner noticed a decrease in acceleration and engine hesitation.

Diagnosis: OBD2 scan revealed P0773, and a visual inspection found damaged wiring to the transmission fluid pressure sensor.

Solution: Repaired the damaged wiring and replaced the transmission fluid to ensure optimal performance.

Cost: $200 (wiring repair: $100, fluid: $100)

Result: The vehicle's performance improved significantly, and the owner was satisfied with the repairs.

Diagnose P0773

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0773
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes