P0777: Pressure Control Solenoid "B" Stuck On
3 vehicles · 1 makes · $150-$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 2010-2015 Chevrolet Camaro, 2010-2017 Chevrolet Equinox (LS, LT, LTZ), and 2007-2019 Chevrolet Silverado 1500 (LT, LTZ, WT, Z71, High Country, LS), with repair costs ranging from $150 to $4,000.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P0777.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the 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 tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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Vehicles Affected (3)
6L80 6-Speed Automatic 2-3 Upshift Flare / Slip
6T70/6T75 transmission shudder, hard shifts & 3-5-reverse wave plate failure
P0700 — Transmission Control System Malfunction from Failed 6L80 TEHCM (or 4L60E Shift Solenoid)
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 $150 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P0777?
Au7o has documented P0777 across 3 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.