P0778: Pressure Control Solenoid B Electrical
4 vehicles · 4 makes · $150-$5,500 repair
Most Reported On
P0778 is an OBD-II diagnostic trouble code meaning “Pressure Control Solenoid B Electrical.” This is a transmission code. Pressure control solenoids regulate the hydraulic fluid pressure that applies the transmission's clutches for smooth, firm gear changes. P0778 specifically flags an electrical fault with Pressure Control Solenoid 'B' — the transmission control module sees that the solenoid's circuit is open, shorted, or drawing current outside the normal range. Symptoms can include harsh or slipping shifts, incorrect line pressure, or the transmission entering limp mode to protect itself. This code is most commonly reported on 2005-2007 Ford Freestyle, 2017-2022 Kia Sportage, and 2003-2024 Toyota 4Runner, plus 1 other vehicle, with repair costs ranging from $150 to $5,500.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0778, 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
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (4)
FAQ
What does P0778 mean?
P0778 stands for "Pressure Control Solenoid B Electrical." This is a transmission code. Pressure control solenoids regulate the hydraulic fluid pressure that applies the transmission's clutches for smooth, firm gear changes. P0778 specifically flags an electrical fault with Pressure Control Solenoid 'B' — the transmission control module sees that the solenoid's circuit is open, shorted, or drawing current outside the normal range. Symptoms can include harsh or slipping shifts, incorrect line pressure, or the transmission entering limp mode to protect itself.
What are the most common causes of P0778?
The most common causes of P0778 are: Failed Pressure Control Solenoid B (electrical fault), Damaged wiring or corroded connector to the solenoid, Low, dirty, or contaminated transmission fluid, Short to power or ground in the solenoid circuit, Internal valve body wear or debris, Clogged solenoid screen or fluid passage, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0778?
Repair costs for P0778 range from $150 to $5,500, depending on the vehicle and root cause.
Which vehicles are affected by P0778?
Au7o has documented P0778 across 4 vehicle models from 4 manufacturers: Ford, Jaguar, Kia, Toyota.
Sources (8)
- NHTSAFord Freestyle Transmission Failure — Car Problem Zoo
- articleMost Common KIA Transmission Problems - YouCanic
- articleDo Kia Sportages Have Transmission Problems? What You Need to Know
- articleAutomatic Transmission May Not Shift Correctly at High Mileages - RepairPal (263 reports)
- ForumJerky transmission shifting - Toyota 4Runner Forum (largest 4Runner forum)
- ForumGearbox/mechatronic problems (ZF 6HP28) - Jaguar Forum
- Forum6HP26 transmission service (2007 XKR) - Jaguar Enthusiasts Forum
- manufacturerZF 6HP26 Mechatronic seals set (bridge-seal kit) - Jaguar-Spirit
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.