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 2 Buick models — most commonly on Enclave, 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 $5,500, 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 Regal(1 issue)
- 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 2 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 $5,500, depending on the specific model and root cause.
Which Buick models have P0776 documented?▼
Au7o has documented P0776 on 2 Buick models: Enclave, Regal.