P0235 Code: Turbocharger Boost Sensor A Circuit Malfunction
🟠 Moderate severity · drivable
Drivable, but boost is not being measured correctly, so power may be reduced — fix it soon.
What P0235 means
The computer detects an electrical fault, like an open or short, in the boost pressure sensor A circuit. This sensor measures how much boost the turbocharger is producing, and without a good reading the computer limits power to protect the engine.
Symptoms
- Check engine light is on
- Loss of power or limp mode
- Poor acceleration
- Possible surging under boost
Common causes
- most common: Faulty boost pressure sensor
- common: Damaged or shorted sensor wiring
- common: Corroded or loose sensor connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the boost pressure sensor | Yes | $50–150 |
| Clean and re-seat the sensor connector | Yes | $0–50 |
| Repair damaged sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0235 code?
Yes, but power may be reduced because the computer can't read boost. Fix it soon.
What is the most common cause of P0235?
A faulty boost pressure sensor, though wiring or connector problems are also common.
How much does it cost to fix a P0235?
Typically $50–150 for a new boost sensor, or less if cleaning the connector works.
Related codes
P0236
P0236 Code: Turbocharger Boost Sensor A Circuit Range/Performance
P0237P0237 Code: Turbocharger Boost Sensor A Circuit Low Input
P0234P0234 Code: Turbocharger Overboost Condition
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.