P0778 on Ford: How to Diagnose & Fix
Pressure Control Solenoid B Electrical
1 Ford model · 1 documented issue · 1 critical · $200-$5,500 repair
P0778 on Ford by model: symptoms, diagnosis and fix
The Ford Freestyle shares the same problematic ZF CVT (Continuously Variable Transmission) as the Ford Five Hundred, and suffers from similar failure modes. The transmission develops poor acceleration, hesitation, stalling, and eventually complete failure, often around 80,000-120,000 miles. The CVT check engine light frequently illuminates as the transmission deteriorates. The manufacturer of the CVT no longer produces new units, making only rebuilt transmissions available at high cost. The Freestyle's heavier weight compared to the Five Hundred (due to its crossover body) puts even more stress on the CVT.
Common Symptoms
- Poor acceleration — vehicle feels sluggish and underpowered
- Transmission hesitates or stumbles during acceleration
- Check engine light illuminates with transmission codes
- Vehicle stalls at low speed or when slowing down
- Whining or droning noise from the transmission
- Complete loss of drive — engine revs but vehicle does not move
How to Fix
Change CVT fluid every 30,000 miles with the correct CVT-specific fluid. If the transmission begins slipping or stalling, have speed sensors and solenoids tested first ($100-$300 for sensor replacement). For complete CVT failure, rebuilt units are available from specialty shops for $3,500-$5,500 installed. Some owners have opted to sell or trade the vehicle rather than invest in a CVT replacement, as the repair cost often exceeds the vehicle's value.
Sources for this issue (1)
P0778 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0778 mean on a Ford?
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. On Ford it is documented across 1 model: Freestyle.
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 on a Ford?
Published repair estimates on Ford range from $200 to $5,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0778 on a different make?
View P0778 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.