Tumble Generator Valve 1 RH Stuck Closed
2012-2016 Subaru Impreza 2.0L H4 🇩🇪
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1091 on Other Vehicles
Common Questions
What does code P1091 mean on a 2012-2016 Subaru Impreza?
P1091 stands for "Tumble Generator Valve 1 RH Stuck Closed". 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.
What are the symptoms of P1091 on a Subaru Impreza?
Common symptoms of P1091 include: Check Engine Light, Reduced power at higher RPM, Restricted airflow sensation, Minor performance loss.
What causes P1091 on a 2012-2016 Subaru Impreza?
Common causes of P1091 include: Carbon buildup preventing valve opening, Faulty TGV actuator motor, Broken or jammed TGV linkage, TGV shaft seized, Actuator circuit fault.