P0778: Pressure Control Solenoid B Electrical
What Does P0778 Mean?
P0778 is a diagnostic trouble code indicating: Pressure Control Solenoid B Electrical. This code relates to the transmission system. It has been reported in NHTSA complaints across 1 different vehicle models.
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"I WAS TRAVELING FROM HOUSTON, TX TO DALLAS, TX MIDDAY ON MAY 1, 2021. I WAS APPROXIMATELY 40 MILES OUTSIDE OF DALLAS ON I-45 TRAVELING 75 MPH WHEN I SUDDENLY FELT A SPUTTER AND THEN THE SPEED INSTANTLY DECREASED FROM 75 MPH TO 20 MPH ON A BUSY MAJOR INTERSTATE. I WAS ALMOST HIT TWICE AS I TRIED TO E"
— Nissan Maxima owner, 05/01/2021
Source: NHTSA Complaints Database
Most Reported Vehicles for P0778
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | NISSAN MAXIMA |
Frequently Asked Questions
Is it safe to drive with this transmission code?
Do I need a full transmission rebuild?
How much does a transmission repair cost?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Check transmission fluid level and condition; top off or change if needed
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.