P0239 — Turbocharger Boost Sensor A Circuit High
Drive with caution — fix soon.
What P0239 means
This code means the voltage signal from turbocharger boost sensor A is higher than expected, often caused by a short to voltage, a wiring fault, or a failed sensor. An actual overboost condition can also trigger it. It's a common turbo code and is usually fixed by repairing the wiring or replacing the boost sensor.
Common symptoms
- Check engine light is on
- Reduced power or hesitation
- Engine may go into reduced-power (limp) mode
- Surging or erratic acceleration
- Poor fuel economy
Common causes
- Faulty turbocharger boost pressure sensor
- Short to voltage in the sensor signal wire
- Wiring or connector corrosion at the sensor
- Open ground circuit for the boost sensor
- Actual turbocharger overboost condition
Typical repair cost
$100 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0239 code?
Usually for short trips, yes, but go easy. The car may limit power or feel jumpy, so avoid hard acceleration and towing and have it checked soon.
How much does it cost to fix a P0239 code?
Expect roughly $100 to $400. Replacing the sensor is the cheaper fix, while diagnosing a wiring short or overboost issue adds labor cost.
Is a P0239 code serious?
It's moderate. It usually won't strand you immediately, but a real overboost or ongoing power loss can stress the turbo, so address it promptly.
Could P0239 mean my turbo is overboosting?
It can. A high reading is sometimes a true overboost from a stuck wastegate or boost control issue, not just a sensor fault, so a proper diagnosis is worth it.