P1088low severityPowertrain
Tumble Generator Valve 1 RH Position Sensor Low
on 2021 Subaru Legacy 2.5L H4 · AWD
What this code means
The PCM has detected a low-voltage condition on the Tumble Generator Valve 1 right-hand position sensor circuit. This is the right bank counterpart to P1086.
Symptoms
- Check Engine Light
- Minor fuel economy reduction
- Slightly increased emissions
Common causes
- Faulty TGV 1 RH position sensor
- Wiring short to ground
- Corroded connector
- Sensor damage from heat
Diagnostic steps
- Check TGV 1 RH position sensor voltage on scan tool
- Inspect sensor connector
- Test wiring for shorts to ground
- Verify reference voltage
- Compare left and right bank TGV readings
Repair notes
Replace the TGV position sensor if faulty; repair wiring if shorted.
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