P0778 on Kia
Pressure Control Solenoid B Electrical
P0778 on Kia vehicles indicates pressure control solenoid b electrical. Au7o has documented this code across 1 Kia model — most commonly on Sportage. 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 Kia range from $400 to $1,800, 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 Kia by Model
Kia Sportage(1 issue)
- 6-Speed Automatic (A6MF) Harsh Shifting and Valve Body Wear2017-2022
The A6MF-family 6-speed automatic can develop harsh or erratic shifting, hard 6-to-4 kickdown 'bang,' shift flares, brief neutral feel during up/downshifts, and torque-converter clutch (TCC) shudder. The root cause is wear of the reducing-valve bores in the valve body, which lets line pressure drift out of spec; neglected fluid (SP4-spec) accelerates the wear. A documented secondary fault is a valve-body bolt that can abrade the internal wiring harness, producing intermittent solenoid faults. This is a distinct transmission failure mode from the AWD rear-differential coupling noise already documented.
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View P0778 across all makes →Frequently Asked Questions
What does P0778 mean on Kia?▼
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 Kia specifically, this code is documented across 1 model.
What causes P0778 on Kia vehicles?▼
Common causes on Kia: 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 Kia?▼
Repair costs on Kia range from $400 to $1,800, depending on the specific model and root cause.
Which Kia models have P0778 documented?▼
Au7o has documented P0778 on 1 Kia model: Sportage.