P0238 Code: Turbocharger Boost Sensor A Circuit High
🟠 Moderate severity · drivable
Drivable, but the boost reading is wrong, which can affect power and may point to overboost.
What P0238 means
The turbo boost pressure sensor is reporting voltage that's too high, which the computer reads as excessive boost pressure. This can be a sensor fault or a genuine overboost condition.
Symptoms
- Check engine light is on
- Loss of power or limp mode
- Possible surging under acceleration
Common causes
- most common: Faulty boost pressure sensor
- common: Genuine overboost condition (wastegate or boost control fault)
- less common: Wiring shorted to power in the sensor circuit
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the boost pressure sensor | Yes | $50–150 |
| Diagnose and repair an overboost condition (wastegate, boost control solenoid) | Mechanic | $100–400 |
Frequently asked questions
Can I drive with a P0238 code?
Yes, but avoid hard acceleration until the boost problem is fixed.
What is the most common cause of P0238?
A faulty boost pressure sensor, though a genuine overboost condition is also possible.
How much does it cost to fix a P0238?
Typically $50–$150 for a new boost sensor, or $100–$400 for wastegate or boost control repairs.
Related codes
P0234
P0234 Code: Turbocharger Overboost Condition
P0237P0237 Code: Turbocharger Boost Sensor A Circuit Low Input
P0236P0236 Code: Turbocharger Boost Sensor A Circuit Range/Performance
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.