P1091moderate severityPowertrain
Tumble Generator Valve 1 RH Stuck Closed
on 1999 Subaru Outback 2.2L H4 · AWD
What this code means
The PCM has detected that the Tumble Generator Valve 1 on the right-hand bank is stuck in the closed position. The valve should open at higher loads to maximize airflow.
Symptoms
- Check Engine Light
- Reduced power at higher RPM
- Restricted airflow sensation
- Minor performance loss
Common causes
- Carbon buildup preventing valve opening
- Faulty TGV actuator motor
- Broken or jammed TGV linkage
- TGV shaft seized
- Actuator circuit fault
Diagnostic steps
- Command TGV open with scan tool and verify position change
- Inspect TGV for carbon or debris obstruction
- Test TGV actuator motor
- Check linkage and shaft for binding
- Inspect actuator wiring
Repair notes
Clean the TGV valve and passage; replace the actuator assembly if mechanically seized.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1