P0238 — Turbocharger Boost Sensor A Circuit Low
Drive with caution — fix soon.
What P0238 means
This code means the voltage signal from turbocharger boost sensor A is lower than expected, which usually points to a short to ground, a wiring fault, or a failed sensor. Sometimes a disconnected or damaged connector is the culprit. It's a common turbo code and is typically fixed by repairing wiring or replacing the boost sensor.
Common symptoms
- Check engine light is on
- Loss of power or weak acceleration
- Engine may enter reduced-power (limp) mode
- Increased fuel consumption
- Hesitation when pressing the accelerator
Common causes
- Faulty turbocharger boost pressure sensor
- Short to ground in the sensor signal wire
- Corroded or loose sensor connector
- Damaged or chafed wiring harness
- Open or broken sensor reference voltage circuit
Typical repair cost
$100 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0238 code?
Short trips are usually fine, but the car may feel weak because it limits power for protection. Avoid hard acceleration and towing, and get it looked at soon.
How much does it cost to fix a P0238 code?
Typically $100 to $400. A simple sensor swap is cheaper, while chasing down a wiring short or harness damage costs more in labor.
Is a P0238 code serious?
It's moderate. You're unlikely to be stranded immediately, but driving with it can mean ongoing reduced power, so don't ignore it for long.
Does P0238 mean my sensor is bad?
Not always. A low signal can come from the sensor itself or from a wiring short, a bad ground, or a loose connector, so the wiring should be checked before replacing parts.