P0778 on Nissan
Pressure Control Solenoid B Electrical
P0778 on Nissan vehicles indicates pressure control solenoid b electrical. Au7o has documented this code across 1 Nissan model — most commonly on Frontier. 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. Typical repair costs on Nissan range from $900 to $3,500, depending on the specific model and root cause.
Common Causes of P0778
- •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)
P0778 on Nissan by Model
Nissan Frontier(1 issue)
- RE5R05A 5-Speed Valve Body and Integrated TCM Solenoid Failure Causing Limp Mode2005-2019
The Jatco RE5R05A five-speed automatic used in the second-generation Frontier carries its transmission control module bolted directly to the valve body, submerged in hot ATF. That packaging is the weak point: sustained heat cycling and vibration crack solder joints and kill solenoid drivers, while the shift solenoids themselves are delicate and intolerant of any contamination. Owners report slipping between gears, delayed or flared upshifts, refusal to shift above a certain gear, and the transmission dropping into a fixed-gear limp mode. This is documented as a failure in its own right and is distinct from - though badly aggravated by - the coolant-into-ATF radiator failure this platform is also known for, since the resulting gel jams the solenoid plungers and shorts the solenoid wiring. Diagnosis is often mistaken for whole-transmission failure when only the valve body and TCM have gone.
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View P0778 across all makes →Frequently Asked Questions
What does P0778 mean on Nissan?▼
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 Nissan specifically, this code is documented across 1 model.
What causes P0778 on Nissan vehicles?▼
Common causes on Nissan: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0778 on a Nissan?▼
Repair costs on Nissan range from $900 to $3,500, depending on the specific model and root cause.
Which Nissan models have P0778 documented?▼
Au7o has documented P0778 on 1 Nissan model: Frontier.