Tumble Generator Valve 2 LH Position Sensor Low
2001-2004 Subaru Outback 3.0L H6
Description
The PCM has detected a low-voltage condition on the Tumble Generator Valve 2 left-hand position sensor circuit. The TGV system creates tumble motion in the intake air to improve combustion efficiency and reduce emissions at low loads.
Symptoms
- Check Engine Light
- Minor reduction in fuel economy
- Slightly higher emissions
Common Causes
- Faulty TGV position sensor
- Wiring short to ground in sensor circuit
- Corroded TGV sensor connector
- Damaged sensor due to heat exposure
Diagnostic Steps
- Check TGV 2 LH position sensor voltage on scan tool
- Inspect sensor connector for corrosion
- Test sensor wiring for shorts to ground
- Check 5V reference at sensor
- Compare readings between left and right TGV sensors
Repair Notes
Replace the TGV position sensor or repair the wiring if shorted to ground.
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
P1086 on Other Vehicles
Common Questions
What does code P1086 mean on a 2001-2004 Subaru Outback?
P1086 stands for "Tumble Generator Valve 2 LH Position Sensor Low". The PCM has detected a low-voltage condition on the Tumble Generator Valve 2 left-hand position sensor circuit. The TGV system creates tumble motion in the intake air to improve combustion efficiency and reduce emissions at low loads.
What are the symptoms of P1086 on a Subaru Outback?
Common symptoms of P1086 include: Check Engine Light, Minor reduction in fuel economy, Slightly higher emissions.
What causes P1086 on a 2001-2004 Subaru Outback?
Common causes of P1086 include: Faulty TGV position sensor, Wiring short to ground in sensor circuit, Corroded TGV sensor connector, Damaged sensor due to heat exposure.