Tumble Generator Valve 1 RH Stuck Open
2012-2016 Subaru Impreza 2.0L H4 🇨🇦
Description
The PCM has detected that the Tumble Generator Valve 1 on the right-hand cylinder bank is stuck in the open position. The valve should close at low engine loads to create intake air tumble.
Symptoms
- Check Engine Light
- Reduced combustion efficiency at low loads
- Slightly rough idle
- Higher emissions
Common Causes
- Carbon buildup preventing valve closure
- Faulty TGV actuator motor
- Broken TGV linkage
- TGV shaft binding
- Actuator wiring issue
Diagnostic Steps
- Command TGV closed with scan tool and monitor position sensor
- Inspect TGV valve for carbon buildup or physical obstruction
- Check TGV actuator motor operation
- Inspect linkage for damage
- Test actuator wiring
Repair Notes
Clean carbon from the TGV valve; replace the TGV actuator if the motor or linkage has failed.
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
P1090 on Other Vehicles
Common Questions
What does code P1090 mean on a 2012-2016 Subaru Impreza?
P1090 stands for "Tumble Generator Valve 1 RH Stuck Open". The PCM has detected that the Tumble Generator Valve 1 on the right-hand cylinder bank is stuck in the open position. The valve should close at low engine loads to create intake air tumble.
What are the symptoms of P1090 on a Subaru Impreza?
Common symptoms of P1090 include: Check Engine Light, Reduced combustion efficiency at low loads, Slightly rough idle, Higher emissions.
What causes P1090 on a 2012-2016 Subaru Impreza?
Common causes of P1090 include: Carbon buildup preventing valve closure, Faulty TGV actuator motor, Broken TGV linkage, TGV shaft binding, Actuator wiring issue.