1. What is P0776 in Honda Accord 10th Gen?

The P0776 OBD-II code stands for Pressure Control Solenoid B Performance/Stuck Off. For the 10th-generation Honda Accord (2018-2024)—equipped exclusively with Honda’s CVT7 W/R continuously variable transmission—this code targets the pressure control solenoid B: a critical component that regulates hydraulic pressure in the CVT, ensuring smooth gear ratio transitions (no fixed "gears") and optimal fuel efficiency (up to 38 MPG highway).

The Accord’s TCM (Transmission Control Module) expects the solenoid to open/close in response to 12V electrical signals, adjusting pressure to the CVT’s pulley system. P0776 triggers when the solenoid either fails to open (stuck off) or doesn’t maintain the required pressure—signaling clogging, electrical failure, or worn internal valves. This issue is widespread in 2019-2023 Accords, addressed in Honda Technical Service Bulletin (TSB) 19-082 for contaminated CVT fluid and solenoid screen clogging (common in stop-and-go city driving).

Accord Specific Note: The pressure control solenoid B in the CVT7 W/R is located inside the transmission valve body, accessible only by removing the transmission pan. Unlike traditional automatics, the Accord’s CVT relies on precise pressure control—even minor solenoid issues cause noticeable driving problems. EX-L and Touring trims (with more stop-and-go use for commuting) are 3x more likely to trigger P0776 than LX base models.

2. Common Causes of P0776 in 2018-2024 Accords

P0776 in Accord CVTs is tied to fluid contamination and solenoid wear—below are real-world cases diagnosed with the ICARZONE UR800:

• Contaminated CVT Fluid (2021 Accord EX-L 1.5T): An EX-L owner with 45,000 miles reported delayed acceleration. The UR800’s CVT Pressure Test showed solenoid B pressure at 20 psi (normal: 35-45 psi). City commuting caused fluid degradation—flushing with Honda CVT fluid (#08200-9008) and replacing the filter fixed pressure.
• Clogged Solenoid Screen (2020 Accord Touring 2.0T): A Touring owner’s P0776 appeared after a fluid change. The UR800’s Solenoid Flow Test showed restricted flow. Aftermarket fluid left debris that clogged the solenoid’s inlet screen—cleaning the screen and refilling with OEM fluid resolved the code.
• Faulty Solenoid B (2019 Accord EX 1.5T): An EX owner’s P0776 paired with "D" light flashing. The UR800’s Solenoid Resistance Test showed 18Ω (normal: 10-14Ω). The solenoid’s internal coil failed—replacing it with OEM #28250-RNA-A01 restored functionality.
• TCM Software Glitch (2022 Accord LX 1.5T): An LX owner’s P0776 was intermittent. The UR800’s TCM Update Check found outdated firmware—installing Honda’s 2023 TCM update (via UR800’s "Honda Calibration" tool) fixed false pressure readings.

3. Key Symptoms of P0776 in Accord CVT

P0776 symptoms in the 10th-gen Accord are transmission-focused and worsen with heavy use (e.g., highway merging, hill climbing). Watch for these signs:

4. Accord Trims/Transmissions Prone to P0776

Honda service data highlights these 2018-2024 Accord configurations with the highest P0776 occurrence rates (all equipped with CVT7 W/R transmission):

5. Diagnose P0776 with ICARZONE UR800

Diagnose P0776 in your Accord CVT accurately with the UR800’s Honda-specific transmission tools. Follow these steps (engine off, transmission in "P"):

Case Example: A 2021 Accord EX-L failed Step 2 (22 psi) and Step 4 (brown fluid). The UR800’s Component Location Tool guided valve body access (remove transmission pan). Flushing fluid, cleaning the solenoid screen, and resetting TCM adaptive learning fixed P0776—verified by test drive (no shuddering, smooth acceleration).

6. How to Fix P0776 in Accord CVT

Resolve P0776 in your 10th-gen Accord with these UR800-verified solutions (match to your diagnosis results):

1. Flush Contaminated CVT Fluid (TSB 19-082)

1. Confirm fluid contamination via UR800’s Step 4. Raise the Accord with jack stands (secure on frame rails).
2. Remove the transmission pan (18 bolts, 8mm socket) — catch fluid in a drain pan (3-4 quarts).
3. Clean the pan’s magnetic drain plug (removes metal debris) and replace the CVT filter (#25430-RNA-A01).
4. Refill with Honda OEM CVT fluid (#08200-9008) — use a funnel to avoid spills (add 3 quarts initially).
5. Start the engine, shift through all gears (P-R-N-D-L) for 30 seconds each, then check fluid level (cold mark on dipstick). Top up if needed.
6. Use UR800’s "TCM Adaptive Reset" tool to clear old pressure learnings—prevents future shuddering.

2. Replace Faulty Solenoid B

1. Confirm solenoid failure via UR800’s Step 3. Remove the transmission pan and valve body (12 bolts, 10mm socket).
2. Locate Solenoid B (labeled "B" on the valve body, near the center).
3. Disconnect the solenoid’s electrical connector and remove the 2 mounting bolts (6mm socket).
4. Install an OEM Solenoid B: #28250-RNA-A01 (fits all 2018-2024 Accord CVTs).
5. Reinstall the valve body (torque bolts to 89 in-lbs) and transmission pan. Refill with OEM fluid and reset TCM via UR800.

3. Update TCM Software

1. Confirm outdated firmware via UR800’s Step 5. Connect the UR800 to the Accord’s OBD-II port (under dashboard).
2. Select "Honda" > "TCM Calibration" > "2018-2024 Accord CVT" — UR800 will detect and download the latest update (requires Wi-Fi).
3. Wait for the update to install (10-15 minutes) — do not turn off the ignition during this process.
4. After installation, clear P0776 with UR800 and test drive for 10 miles—verify no pressure-related symptoms.

7. P0776 Repair Costs & Maintenance Tips

P0776 repair costs for the 10th-gen Accord CVT vary by cause. Use this table to budget:

Maintenance Tips for Accord CVT Owners

• EX-L/Touring owners (city commuters): Flush CVT fluid every 30,000 miles (per TSB 19-082) — never exceed 40,000 miles, as fluid degrades faster in stop-and-go traffic.
• Use only Honda OEM CVT fluid (#08200-9008) — aftermarket fluids lack Honda’s friction modifiers, causing solenoid clogging and TCM errors.
• Inspect CVT fluid level monthly — low fluid causes low pressure, triggering P0776. Check when the transmission is cold (parked overnight) for accuracy.
• Avoid "jackrabbit" starts and heavy towing (over 1,000 lbs) — excessive torque strains solenoid B, accelerating wear.
• Perform the UR800’s CVT Health Check every 15,000 miles — monitor solenoid pressure and fluid condition to catch issues early.

8. Accord-Specific FAQs