P0779 - Gear Shift Timing Issue in Honda Accord, Toyota Camry, and More

Quick Answer

P0779 means: P0779 indicates an issue with the transmission fluid pressure control solenoid 'B,' affecting gear shifting.

Fix: Check and replace faulty components Cost: $200 - $500 Time: 90-180 minutes

Can I drive with P0779? Immediate attention is recommended to avoid further damage to the transmission.

Common Questions

What does P0779 mean and how does it affect my car?

The P0779 code indicates a malfunction in the transmission's control system, specifically with the fluid pressure control solenoid 'B.' This can lead to poor shifting performance, increased wear on transmission components, and ultimately affect your vehicle's drivability and safety.

What are the most common causes of P0779 and how much does it cost to fix?

Most commonly, a faulty transmission fluid pressure control solenoid 'B' is the culprit, with repair costs averaging between $200 and $500. Other causes may include low transmission fluid levels or wiring issues, which are generally less expensive to fix.

Can I drive my car with P0779 or should I stop immediately?

While it may be possible to drive a short distance, it's not advisable to ignore the P0779 code. Continued driving can lead to severe transmission damage and costly repairs. It's best to have it inspected as soon as possible.

How can I diagnose P0779 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a full OBD2 scan to retrieve the P0779 code and view freeze frame data. This data helps you understand the conditions under which the error occurred, guiding you in diagnosing whether the issue is with the solenoid or related components.

What vehicles are most commonly affected by P0779?

Common vehicles affected by the P0779 code include the 2007-2012 Honda Accord, 2006-2011 Toyota Camry, and various models from Ford and Nissan. Always check for specific recalls or Technical Service Bulletins related to your vehicle.

How can I prevent P0779 from happening again?

Regular maintenance is key! Ensure you check and change your transmission fluid at recommended intervals and watch for any signs of transmission problems, such as slipping or unusual noises, to catch issues early.

What is P0779?

The DTC P0779 code indicates a malfunction related to the transmission system, specifically the shift timing of the transmission. This code typically points to an issue with the transmission fluid pressure control solenoid 'B,' which is responsible for regulating the hydraulic pressure needed for smooth and timely gear shifts. When this solenoid fails or experiences issues, it can lead to delayed shifting, harsh engagements, or even complete transmission failure. Commonly found in vehicles like the 2007-2012 Honda Accord and the 2006-2011 Toyota Camry, the P0779 code can lead to significant driving concerns. If left unaddressed, you may notice your vehicle hesitating during acceleration or struggling to change gears. In some cases, it might result in severe transmission damage, leading to costly repairs or even a full transmission replacement. Drivers should take this code seriously, as it has implications for both vehicle performance and safety. Regular maintenance, including fluid checks and changes, can help prevent issues like P0779 from occurring in the first place.

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

Symptoms

Common symptoms when P0779 is present:

  • Check engine light stays illuminated, indicating a fault in the transmission system.
  • Engine hesitates during acceleration, causing a sluggish response when pressing the gas pedal.
  • Fuel economy decreased by 10-15%, leading to increased fuel expenses and poor performance.
  • Harsh or delayed shifting, which can result in a jarring experience while driving.
  • Unusual noises such as grinding or whining when changing gears, indicating potential mechanical issues.

Possible Causes

Most common causes of P0779 (ordered by frequency):

  1. Faulty transmission fluid pressure control solenoid 'B' (70% likelihood) - This is the most common cause of code P0779, where the solenoid may fail to operate correctly due to wear or electrical issues.
  2. Low transmission fluid levels (15% likelihood) - Insufficient fluid can lead to inadequate pressure, affecting the solenoid’s performance and causing shifting problems.
  3. Wiring issues (10% likelihood) - Damaged or corroded wiring connected to the solenoid can disrupt its function, leading to code P0779.
  4. Transmission pump failure (3% likelihood) - A failing pump may not provide sufficient pressure to operate the solenoid effectively, resulting in poor transmission performance.
  5. Internal transmission damage (2% likelihood) - Rarely, internal components of the transmission may be worn or damaged, contributing to the error code.

P0779 Repair Costs

Cost Breakdown by Repair Type

Replace Transmission Fluid Pressure Control Solenoid 'B'

Replacing the faulty solenoid with a new part to restore proper transmission function.

  • Total: $200 - $500
  • Success rate: 85%
Transmission Fluid Change

Changing the transmission fluid to ensure proper levels and quality.

  • Total: $100 - $200
  • Success rate: 60%
Money-Saving Tips for P0779
  • 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 P0779 Diagnosis Process

Follow these systematic steps to accurately diagnose P0779. 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 on the transmission harness (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion on the transmission harness (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 and history (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and history (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 voltage and resistance at the transmission fluid pressure control solenoid (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the voltage and resistance at the transmission fluid pressure control solenoid (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: Fluid level and condition check - Inspect the transmission fluid for proper levels and quality; replace if necessary (10-15 minutes)

Step 4: Fluid level and condition check - Inspect the transmission fluid for proper levels and quality; replace if necessary (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: System function test - Verify proper operation after repairs, clear codes, and monitor for any reoccurrences (10-15 minutes)

Step 5: System function test - Verify proper operation after repairs, clear codes, and monitor for any reoccurrences (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.

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 2008 Honda Accord

Vehicle: 2008 Honda Accord, 120,000 miles

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

Diagnosis: Using the GeekOBD APP, the P0779 code was retrieved. A visual inspection revealed a faulty transmission fluid pressure control solenoid.

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

Cost: $450 (parts: $250, labor: $200)

Result: Vehicle shifted smoothly post-repair, with no warning lights.

Case Study 2: Fluid Change and Inspection on 2010 Toyota Camry

Vehicle: 2010 Toyota Camry, 90,000 miles

Problem: Vehicle hesitated during acceleration with a check engine light on.

Diagnosis: P0779 was confirmed via scan, and fluid levels were low.

Solution: Replenished transmission fluid and cleared the error codes.

Cost: $150 (fluid: $80, labor: $70)

Result: Hesitation resolved, and the check engine light remained off.

Diagnose P0779

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: P0779
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes