P1091 fault code: what it means

P1091: Subaru code: tumble generator valve (TGV) #1, right side, stuck closed.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

seized TGV shaft or carbon build-up
faulty TGV motor
TGV wiring fault

P1091 by make

Subaru

Subaru code: tumble generator valve (TGV) #1, right side, stuck closed.

Usual causes: seized TGV shaft or carbon build-up; faulty TGV motor; TGV wiring fault

What the repair usually costs

Intake valve carbon clean (walnut blast, direct injection)NZ$530–NZ$1,190 · A$560–A$1,240

Not sure what P1091 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.