P0777 on 2010-2017 Chevrolet Equinox (LS, LT, LTZ) — Pressure Control Solenoid "B" Stuck On
1 vehicles · 1 makes · $1,800-$4,000 repair
Most Reported On
P0777 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2010-2017 Chevrolet Equinox (LS, LT, LTZ), with repair costs ranging from $1,800 to $4,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0777, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0777 mean?
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.
What are the most common causes of P0777?
The most common causes of P0777 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0777?
Repair costs for P0777 range from $1,800 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P0777?
Au7o has documented P0777 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.