The code P0776: “Pressure Control Solenoid ‘B’ Performance or Stuck Off” indicates a malfunction in the operation of the transmission’s pressure control solenoid ‘B’. This solenoid regulates the hydraulic pressure in the transmission, and its malfunction can lead to issues with gear shifting, potentially causing erratic or harsh transmission behavior.
P0776 quick overview
| Meaning | P0776: Pressure Control Solenoid ‘B’ Performance or Stuck Off |
| Is it serious? | Yes, it can significantly affect transmission performance, possibly leading to further damage. |
| Possible causes | – Faulty or sticking pressure control solenoid ‘B’ – Hydraulic blockages in transmission fluid passages – Low or dirty transmission fluid – Wiring or electrical issues related to the solenoid – Transmission control module (TCM) faults |
| How to diagnose? | Inspect Solenoid: Check pressure control solenoid ‘B’ for proper function and resistance. Check Transmission Fluid: Ensure fluid is at the correct level and clean. Evaluate Wiring and Connectors: Examine wiring and connectors for damage or corrosion. Assess Hydraulic Passages: Look for blockages in the transmission’s hydraulic system. Scan for Additional Codes: Use a diagnostic scanner to check for other transmission-related codes. Consider TCM Health: Evaluate the transmission control module for software updates or faults. |
P0776 Meaning
In simpler terms, the P0776 code means there’s a problem with a valve (solenoid ‘B’) in your car’s transmission that controls the pressure of the fluid used to shift gears. When this valve isn’t working right, you might experience issues with how your car shifts gears, like jerky movements or unusual responses when accelerating. The cause could be anything from the valve itself being faulty, blockages in the system, electrical issues, or even problems with the car’s transmission fluid.
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How to fix P0776 – learn from mechanics
I looked into P0776 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Toyota
Vehicle Information
- 2010 Toyota Camry LE 2.5L
Issue + Repair History
- MIL light on with repeated code P0776 (Shift Solenoid SL2)
- Tested all solenoids with a scan tool, they appeared functional
- Transmission not providing ground to solenoids
Other OBD2 Codes + Test Results
- P0776 – Shift Solenoid SL2
Suggested Fixes
- Check TCM (Transmission Control Module) for grounding issues
- Inspect body and TCM grounds
- Consider TCM issue, possibly a malfunctioning capacitor within the TCM
- Check for computer problems related to transmission, potential reflash or ECU replacement
- Evaluate the hydraulic or mechanical components related to the shift solenoid
Final Fix
- Replaced with a used ECM (Engine Control Module)
- Drove 429 miles with no recurrence of the code
Case #2: Dodge
Vehicle Information
- 2009 Dodge Ram 5500 ST 6.7L
Issue + Repair History
- Vehicle goes into failsafe mode after 1-2 shift
- Problem occurred twice, both times after a 7″ snowstorm
- Happening even in clear and dry conditions now
Other OBD2 Codes + Test Results
- P0776
- P0766
- P0983
Suggested Fixes
- Check all harness connectors and wiring for damage from snow or ice
- Use a circuit tester to check for continuity in wiring
- Consider potential technical service bulletins (TSBs) or recalls
- Check for software updates (flash updates) for electronic issues
- Test and charge battery, perform capacity discharge to reset modules
Final Fix
- Disconnected transmission harnesses found to be corroded and rusty
- Replaced internal transmission harnesses and vehicle harness
- Vehicle returned to normal operation
Case #3: Buick
Vehicle Information
- 2008 Buick Enclave CX 3.6L
Issue + Repair History
- Loss of reverse and default gear in forward
- Occurred twice after a snowstorm
- Problem intermittent, resolves after restarting the vehicle
- Same issue reoccurred after several hundred miles of normal operation
Other OBD2 Codes + Test Results
- P0776 – Solenoid 2 Stuck Off
- P0961 – Line Pressure Control
- P2728 – Solenoid 5 Stuck Off
- P2762 – TCC Fault
Suggested Fixes
- Check fluid condition and level
- Suspect 3/5 clutch failure
- Drain transmission fluid to check for shiny metal (indicating broken wave plate)
- Suspect either poor connections or TCM failure
- Time for remanufactured transmission
- Flush cooler lines and flow check
Final Fix
- Internal mechanical problem inside transmission
- Replaced internal transmission components due to failure
Case #4: Chevrolet
Vehicle Information
- 2011 Chevrolet Cruze LS 1.8L
Issue + Repair History
- No forward motion, reverse works fine
- Fluid very dark, flushed but issue persisted
- After attempts in manual shift mode, engaged in a high gear and threw code P2723
- Problem intermittent, difficult to duplicate
Other OBD2 Codes + Test Results
- P0776 – Shift Solenoid SL2
- P0766 – Shift Solenoid SL2
- P0983 – Shift Solenoid SL2
Suggested Fixes
- Inspect transmission fluid condition and level
- Consider possibility of clutch failure or internal transmission issue
- Check for poor connections or TCM failure
- Evaluate the hydraulic or mechanical components related to the shift solenoid
Final Fix
- Discovered a technical bulletin regarding the issue
- Replaced and programmed TCM, resolving the problem
Case #5: Toyota
Vehicle Information
- 1998 Toyota Camry CE 2.2L
Issue + Repair History
- Sets code P0773 (Shift Solenoid E Electrical Malfunction)
- Checked continuity from ECU to Shift Solenoid E, wire checks good
- Replaced Lock up Solenoid with resistance within spec
- Code reoccurs after a day or two
Other OBD2 Codes + Test Results
- P0773 – Shift Solenoid E Electrical Malfunction
Suggested Fixes
- Verify if correct solenoid part from the dealer is used
- Check ECU grounds and power feed
- Run a new wire from ECU to transmission
- Use a scope to test solenoid operation and waveform pattern
- Consider replacing the ECU
Final Fix
- Customer opted to get rid of the car rather than further investigate potential ECU issue
How to diagnose P0776
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Common Advice for Solving Code P0776 | Diagnostic Step Description |
|---|---|
| Check Solenoid and Wiring Integrity | Verify the solenoid’s condition and ensure wiring from ECU to solenoid is intact without any open or short circuits. |
| Inspect and Replace Solenoid | If the solenoid shows signs of failure or inconsistency, replace it, preferably with an OEM part. |
| Examine ECU Connections | Check the ECU for any loose connections, corrosion, or signs of malfunction. |
| Run a New Wire from ECU to Solenoid | If there’s suspicion of wiring issues, bypass existing wires by running a new wire directly from the ECU to the solenoid. |
| Test Solenoid with a Scope | Use a diagnostic scope to observe the solenoid’s operation and ensure it’s functioning as intended. |
| Consider Replacing the ECU | If all other checks are inconclusive, the ECU itself may be faulty and require replacement. |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko