P0776 on Buick
Pressure Control Solenoid B Performance/Stuck Off
P0776 on Buick vehicles indicates pressure control solenoid b performance/stuck off. Au7o has documented this code across 3 Buick models — most commonly on Enclave, Encore GX, Regal. This code means the transmission's Pressure Control Solenoid B is not performing correctly and is behaving as if stuck in the 'off' position. Pressure control solenoids regulate the hydraulic fluid pressure used to apply clutches and bands and to control shift quality, so when one underperforms the transmission may shift harshly, slip, flare between gears, or feel inconsistent. The transmission control module sets this code when the fluid pressure or response it measures doesn't match what it commanded from that solenoid. It generally indicates a hydraulic performance issue with the solenoid or its fluid circuit rather than just a wiring fault. Typical repair costs on Buick range from $150 to $7,800, depending on the specific model and root cause.
Common Causes of P0776
- •Stuck or failed pressure control solenoid B
- •Low, dirty, or degraded transmission fluid
- •Clogged solenoid screen or valve body passages
- •Sticking or worn valve body components
- •Wiring or connector problem at the solenoid
- •Internal transmission wear or pressure loss
- •Faulty transmission control module
P0776 on Buick by Model
Buick Enclave(1 issue)
- 6T70/6T75 Transmission Wave Plate Failure2008-2012
First-generation Enclaves (2008-2017) use the 6T70/6T75 6-speed automatic, whose stamped-steel 35R wave plate can crack at the teeth after enough shift cycles. When it fractures, the transmission abruptly loses 3rd, 5th, and reverse gears, and debris can damage the valve body, drums, and torque converter. Failure typically occurs in higher-mileage 2008-2012 builds.
Buick Encore GX(1 issue)
- VT40 CVT Pressure Control Solenoid Failure - Complete Loss of Motive Power (P2714 / P0700)2020-2025
Separate from the well-known low-speed shudder, the VT40 continuously variable transmission suffers hard failures of the line-pressure control solenoid circuit. When the solenoid sticks off, the belt-and-pulley set loses clamping pressure, the transmission cannot transmit torque, and the vehicle abruptly stops accelerating - owners describe engine RPM climbing with no forward motion, or being unable to exceed 20 mph with the pedal floored, sometimes on a highway. Failures are reported between roughly 40,000 and 83,000 miles, and multiple NHTSA complaints describe a second failure after an earlier transmission replacement. Some units have been found with essentially no fluid in the sealed case at teardown.
Buick Regal(2 issues)
- 6T70/6T40 Automatic Transmission Shudder, Slipping & Hard Shifts2011-2017
Regals equipped with the GM 6T40/6T70 six-speed automatic can develop torque-converter shudder, slipping or flare on the 2-6 shift, and harsh/delayed shifts. The 6T40 issue is commonly debris blocking the 2-6 clutch regulator valve circuit; the 6T70 suffers wear in the accumulator/solenoid valve bores and torque-converter clutch shudder, sometimes worsened by overheated, degraded fluid.
- Regal Aisin AF40 6-Speed Harsh Shifts / Shudder2011-2017
The Aisin AF40 6-speed automatic in 2011-2017 Regal (and 2010-2017 LaCrosse 4-cyl, 2008-2017 Opel Insignia A) develops harsh 1-2 and 2-3 shifts, torque-converter shudder at light throttle, and delayed engagement, usually 80,000-150,000 miles. GM's "lifetime fill" claim is widely disputed by independent shops.
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View P0776 across all makes →Frequently Asked Questions
What does P0776 mean on Buick?▼
P0776 stands for "Pressure Control Solenoid B Performance/Stuck Off." This code means the transmission's Pressure Control Solenoid B is not performing correctly and is behaving as if stuck in the 'off' position. Pressure control solenoids regulate the hydraulic fluid pressure used to apply clutches and bands and to control shift quality, so when one underperforms the transmission may shift harshly, slip, flare between gears, or feel inconsistent. The transmission control module sets this code when the fluid pressure or response it measures doesn't match what it commanded from that solenoid. It generally indicates a hydraulic performance issue with the solenoid or its fluid circuit rather than just a wiring fault. On Buick specifically, this code is documented across 3 models.
What causes P0776 on Buick vehicles?▼
Common causes on Buick: Stuck or failed pressure control solenoid B, Low, dirty, or degraded transmission fluid, Clogged solenoid screen or valve body passages, Sticking or worn valve body components, Wiring or connector problem at the solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0776 on a Buick?▼
Repair costs on Buick range from $150 to $7,800, depending on the specific model and root cause.
Which Buick models have P0776 documented?▼
Au7o has documented P0776 on 3 Buick models: Enclave, Encore GX, Regal.