P0776 on GMC
Pressure Control Solenoid B Performance/Stuck Off
P0776 on GMC vehicles indicates pressure control solenoid b performance/stuck off. Au7o has documented this code across 1 GMC model — most commonly on Yukon. 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 GMC range from $600 to $4,000, 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 GMC by Model
GMC Yukon(1 issue)
- 10L80 10-Speed Transmission Harsh Shifting, Shudder and Rear-Wheel Lock-Up2021-2023
The 10L80/10L90 ten-speed automatic exhibits harsh 1-2 upshifts when cold, steady-speed shudder around 40-70 mph, and a lag into Drive/Reverse that ends with a jolt. The failure point is valve-body wear and internal pressure leaks. In the worst case a transmission control-valve defect can cause a momentary rear-wheel lock-up; GM issued a large recall covering over 460,000 2020-2022 Silverado/Sierra/Tahoe/Suburban/Yukon/Escalade for this control valve. Multiple class-action suits have been filed and symptoms often surface between 40,000-60,000 miles.
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View P0776 across all makes →Frequently Asked Questions
What does P0776 mean on GMC?▼
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 GMC specifically, this code is documented across 1 model.
What causes P0776 on GMC vehicles?▼
Common causes on GMC: 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 GMC?▼
Repair costs on GMC range from $600 to $4,000, depending on the specific model and root cause.
Which GMC models have P0776 documented?▼
Au7o has documented P0776 on 1 GMC model: Yukon.