What does code P1094 mean?

Q: What does code P1094 mean?

Tumble Generator Valve Circuit #1 Open Circuit. P1094 on a Subaru means the engine control module (ECM) has detected an open circuit in the wiring for the tumble generator valve (TGV) on bank 1, which is the passenger side on left-hand-drive vehicles. The TGV system uses butterfly valves in the intake ports to create turbulence at low engine speeds for better combustion, and an open circuit means the ECM cannot command or monitor that valve. This typically results in the valve staying in its default position and may trigger reduced performance or a check engine light.

DTC codes / Subaru codes / P1094

P1094 · SubaruTumble Generator Valve Circuit #1 Open Circuit

P1094 on a Subaru means the engine control module (ECM) has detected an open circuit in the wiring for the tumble generator valve (TGV) on bank 1, which is the passenger side on left-hand-drive vehicles. The TGV system uses butterfly valves in the intake ports to create turbulence at low engine speeds for better combustion, and an open circuit means the ECM cannot command or monitor that valve. This typically results in the valve staying in its default position and may trigger reduced performance or a check engine light.

SystemPowertrain

Code typeSubaru specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Guidance is general and written for Subaru vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.