P077F - Understanding DTC P077F: Common Issues in 2015-2019 Ford F-150 and Honda Accord

Quick Answer

P077F means: DTC P077F indicates a problem with the transmission fluid pressure control solenoid 'B'.

Fix: Check and replace faulty components Cost: $200 - $600 Time: 90-180 minutes

Can I drive with P077F? Immediate attention is recommended to avoid transmission damage.

Common Questions

What does P077F mean and how does it affect my car?

DTC P077F indicates an issue with the transmission fluid pressure control solenoid 'B'. This can lead to harsh shifting, decreased fuel economy, and potential transmission failure if not addressed. Ensuring your vehicle operates smoothly and efficiently requires prompt attention to this code.

What are the most common causes of P077F and how much does it cost to fix?

The common causes include a faulty solenoid, low fluid levels, and wiring issues. Repair costs can range from $50 for fluid top-offs to $600 for solenoid replacements, depending on the severity of the issue.

Can I drive my car with P077F or should I stop immediately?

It's advisable to cease driving your vehicle if you see the P077F code. Continuing to drive may exacerbate transmission issues, leading to costly repairs.

How can I diagnose P077F myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for trouble codes, view freeze frame data, and monitor real-time engine parameters to help identify issues with your transmission system.

What vehicles are most commonly affected by P077F?

Models like the 2015-2019 Ford F-150 and 2016-2020 Honda Accord frequently experience this code. It's crucial to stay updated on any recalls or technical service bulletins related to these models.

How can I prevent P077F from happening again?

Regular maintenance, including timely transmission fluid changes and inspections of the solenoid and wiring, can greatly reduce the risk of encountering DTC P077F again in the future.

What is P077F?

DTC P077F is a diagnostic trouble code indicating a problem with the transmission fluid pressure control solenoid 'B' performance or a related issue. This code is commonly found in vehicles equipped with automatic transmissions, particularly in models such as the 2015-2019 Ford F-150 and the Honda Accord from 2016-2020. When the powertrain control module (PCM) detects that the transmission fluid pressure solenoid is not functioning as intended, it triggers this code. The solenoid is responsible for regulating the hydraulic pressure within the transmission, which ensures smooth shifting and optimal performance. If this component fails or operates outside its specified parameters, you may experience significant transmission issues, including hard shifting, slipping, or even a complete inability to shift gears. Ignoring this code can lead to further damage to the transmission, making it crucial for vehicle owners to address the issue promptly. Regular maintenance, including fluid changes and inspections, can help prevent the emergence of this code and ensure the longevity of your vehicle's transmission system.

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

Symptoms

Common symptoms when P077F is present:

  • The check engine light illuminates and remains on, indicating a persistent issue that needs immediate attention.
  • Drivers may notice harsh or erratic shifting, where the vehicle hesitates or jerks during gear changes, impacting overall driving comfort.
  • Fuel economy may decrease significantly, with reports of efficiency dropping by 10-15% as the transmission struggles to function properly.
  • The vehicle may experience slipping, where the engine revs without corresponding acceleration, a sign that the transmission is not engaging correctly.
  • In severe cases, the vehicle may enter 'limp mode', restricting performance and preventing normal acceleration to protect the transmission.

Possible Causes

Most common causes of P077F (ordered by frequency):

  1. The most common cause of DTC P077F is a faulty transmission fluid pressure control solenoid, which accounts for about 60% of cases. This can occur due to wear and tear or fluid contamination.
  2. Another potential cause is low transmission fluid levels, which can be due to leaks or inadequate maintenance, affecting the hydraulic pressure needed for proper shifting.
  3. Wiring issues, such as damaged connectors or short circuits, may also lead to this code, making it important to inspect the electrical system thoroughly.
  4. Less common but serious causes include internal transmission damage or a malfunctioning PCM, which can prevent accurate pressure regulation and require extensive repairs.
  5. A rare but possible cause is software issues within the PCM that may require a reprogramming or update to resolve the DTC.

P077F Repair Costs

Cost Breakdown by Repair Type

Transmission Fluid Pressure Control Solenoid Replacement

Replacing the faulty solenoid is the most effective solution to resolve DTC P077F.

  • Total: $200 - $600
  • Success rate: 85%
Fluid Level Check and Top-Off

If low fluid levels are detected, a simple top-off may solve the issue temporarily.

  • Total: $50 - $150
  • Success rate: 60%
PCM Reprogramming

In cases where the PCM is malfunctioning, a software update may be needed.

  • Total: $100 - $300
  • Success rate: 70%
Money-Saving Tips for P077F
  • 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 P077F Diagnosis Process

Follow these systematic steps to accurately diagnose P077F. 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 to test the transmission fluid pressure control solenoid and wiring continuity (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the transmission fluid pressure control solenoid and wiring continuity (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 - After repairs, verify proper operation of the solenoid and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After repairs, verify proper operation of the solenoid 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 shifting is smooth (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure shifting is smooth (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 Solenoid Replacement on a 2017 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

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

Diagnosis: After scanning with the GeekOBD APP, DTC P077F was confirmed. Visual inspection showed a faulty solenoid.

Solution: Replaced the transmission fluid pressure control solenoid and performed a fluid change.

Cost: $400 (includes parts and labor)

Result: The shifting improved significantly, and the check engine light was cleared successfully.

Case Study 2: Fluid Level Check on a 2018 Honda Accord

Vehicle: 2018 Honda Accord, 30,000 miles

Problem: Customer noticed slipping and a check engine light.

Diagnosis: DTC P077F was identified; low fluid levels were confirmed during inspection.

Solution: Topped off the transmission fluid and cleared the code.

Cost: $80 (fluid top-off and inspection)

Result: The vehicle returned to normal operation with no further issues.

Diagnose P077F

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: P077F
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes