P0778Transmission

Pressure Control Solenoid B Electrical

P0778 means an electrical fault in transmission pressure control solenoid B. This solenoid regulates pressure for certain circuits, so faults affect shift feel and can damage the transmission.

🚗 Risky. Pressure control faults can cause slipping and internal damage. Address it soon.
HIGH
severity
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🎯 Top Causes, Ranked by Likelihood

#1Faulty pressure control solenoid B$150-$600
40%
The solenoid has an electrical fault and cannot regulate pressure.
#2Wiring or connector fault$40-$300
30%
Damaged wiring or a corroded connector in the circuit.
#3Low or contaminated fluid$80-$300
15%
Poor fluid disrupts solenoid operation.
#4Valve body wear$300-$1200
15%
Worn passages affect pressure control.

🩺 Common Symptoms

💰 Repair Cost: DIY vs Shop

DIY Cost
$80-$600
Shop Cost
$200-$1200

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0778

1Check the fluid level and condition
2Inspect the solenoid wiring and connector
3Test pressure control solenoid B
4Service the valve body if needed

❓ Frequently Asked Questions

Can I drive with P0778?
Risky. Improper pressure control can damage the transmission. Fix it soon.
How much to fix P0778?
A solenoid is often $200-$600; valve body work costs more.
Is P0778 serious?
Yes. Pressure control is critical to transmission health.

🔗 Related Codes

P0777P0779P0745P0796
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