P0777 on Chevrolet
Pressure Control Solenoid "B" Stuck On
P0777 on Chevrolet vehicles indicates pressure control solenoid "b" stuck on. Au7o has documented this code across 1 Chevrolet model — most commonly on Equinox. This code sets when the transmission control module determines that pressure control solenoid B is stuck in the ON/applied state and is not responding to commands to release. This solenoid regulates hydraulic pressure that controls clutch apply and shift feel, so a stuck solenoid causes incorrect line pressure. You may experience harsh shifts, slipping, or the transmission being locked into a particular pressure or gear. Prolonged operation can overheat and damage the transmission. Typical repair costs on Chevrolet range from $1,800 to $4,000, depending on the specific model and root cause.
Common Causes of P0777
- •Pressure control solenoid B stuck mechanically
- •Debris or varnish in the valve body
- •Dirty or degraded transmission fluid
- •Low transmission fluid level
- •Internal valve body wear or sticking
- •Electrical fault in the solenoid circuit
- •Faulty transmission control module (less common)
P0777 on Chevrolet by Model
Chevrolet Equinox(1 issue)
- 6T70/6T75 transmission shudder, hard shifts & 3-5-reverse wave plate failure2010-2017
Equinox models with the GM 6T70/6T75 six-speed automatic suffer shudder, harsh or delayed shifts, slipping, and loss of reverse. A common root cause is failure of the 3-5-reverse wave plate, which can crack and cause extreme shudder when reverse is engaged and eventual loss of drive. Overheated/degraded fluid that loses viscosity accelerates internal wear. Failures typically appear between roughly 60,000 and 150,000 miles. Owners report bucking when engaging gear, failure to shift out of 2nd, and inability to engage reverse.
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View P0777 across all makes →Frequently Asked Questions
What does P0777 mean on Chevrolet?▼
P0777 stands for "Pressure Control Solenoid "B" Stuck On." This code sets when the transmission control module determines that pressure control solenoid B is stuck in the ON/applied state and is not responding to commands to release. This solenoid regulates hydraulic pressure that controls clutch apply and shift feel, so a stuck solenoid causes incorrect line pressure. You may experience harsh shifts, slipping, or the transmission being locked into a particular pressure or gear. Prolonged operation can overheat and damage the transmission. On Chevrolet specifically, this code is documented across 1 model.
What causes P0777 on Chevrolet vehicles?▼
Common causes on Chevrolet: Pressure control solenoid B stuck mechanically, Debris or varnish in the valve body, Dirty or degraded transmission fluid, Low transmission fluid level, Internal valve body wear or sticking. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0777 on a Chevrolet?▼
Repair costs on Chevrolet range from $1,800 to $4,000, depending on the specific model and root cause.
Which Chevrolet models have P0777 documented?▼
Au7o has documented P0777 on 1 Chevrolet model: Equinox.