Turbocharger/Supercharger Inlet Pressure Sensor Circuit Intermittent/Erratic (Downstream of throttle valve)
This code means the PCM/ECM has detected an intermittent signal or connection affecting turbocharger/supercharger inlet pressure sensor circuit. On turbocharged or supercharged engines, this can upset airflow and boost control, causing low power, poor acceleration, smoke, or limp mode.
What You Might Notice
- Check Engine Light illuminated
- Reduced boost or low power
- Poor acceleration
- Engine may enter limp mode
- Possible smoke under load
Most Common Causes
- 1
Boost leak, intake leak, or loose charge pipe
- 2
Loose connector, rubbed-through wiring, or vibration-related fault
- 3
Damaged wiring/connectors
- 4
Sticking wastegate or turbo/supercharger issue
- 5
PCM control fault
How to Diagnose It
- 1
Check Boost leak, intake leak, or loose charge pipe — Inspect for signs of failure and test before replacing.
- 2
Check Loose connector, rubbed-through wiring, or vibration-related fault — Inspect for signs of failure and test before replacing.
- 3
Check Damaged wiring/connectors — Inspect for signs of failure and test before replacing.
- 4
Check Sticking wastegate or turbo/supercharger issue — Inspect for signs of failure and test before replacing.
- 5
Check PCM control fault — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Pressure-test the intake/boost system for leaks
- 2
Inspect and repair wiring/connectors to the control solenoid or sensor
- 3
Test and replace the faulty boost-related component
- 4
Inspect the turbo/supercharger and wastegate for sticking or damage
- 5
Clear the code and confirm boost control during a road test
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