What causes P1778 on a Honda?

Failed clutch pressure control solenoid valve C Open or shorted solenoid wiring inside the transmission Burnt ATF clogging the solenoid valve screen Corroded external solenoid connector Low ATF level starving the solenoid circuit

How do I fix P1778 on a Honda?

Check ATF level and condition first since burnt fluid kills solenoids Test solenoid C resistance against Honda specifications Inspect the external connector for ATF wicking and corrosion Command the solenoid with a Honda HDS scan tool and watch pressure response Replace the solenoid after confirming the circuit is intact

P1778 Clutch Pressure Control Solenoid Valve C Circuit

Q: What does P1778 mean on a Honda?

P1778. Clutch Pressure Control Solenoid Valve C Circuit. Applies to Accord, Odyssey, Pilot with automatic transmission.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: Accord, Odyssey, Pilot with automatic transmission

What does P1778 mean on a Honda?

P1778. Clutch Pressure Control Solenoid Valve C Circuit. This Honda-enhanced code applies to Accord, Odyssey, Pilot with automatic transmission.

Common causes of P1778

Failed clutch pressure control solenoid valve C
Open or shorted solenoid wiring inside the transmission
Burnt ATF clogging the solenoid valve screen
Corroded external solenoid connector
Low ATF level starving the solenoid circuit

How to fix P1778

Check ATF level and condition first since burnt fluid kills solenoids
Test solenoid C resistance against Honda specifications
Inspect the external connector for ATF wicking and corrosion
Command the solenoid with a Honda HDS scan tool and watch pressure response
Replace the solenoid after confirming the circuit is intact

Sources and review

Last updated 2026-09-07.