P0239 — Turbocharger/Supercharger Boost Sensor B Circuit

What Does P0239 Mean?

P0239 is a diagnostic trouble code indicating: Turbocharger/Supercharger Boost Sensor B Circuit. This code relates to the fuel injection system. It has been reported in NHTSA complaints across 1 different vehicle models.

Symptoms of P0239

⚠️ Check engine light illuminated

Common Causes

🔍 Failed or deteriorated catalytic converter
🔍 Throttle body or throttle position sensor issue
🔍 Turbocharger or boost system issue
🔍 Sensor or control module malfunction

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"This is ongoing. Originally got trouble code p0239 after check engine light, cleaned throttle body. It went away. Then i got the same symptoms as a result of the throttle position sensor. I replaced that as well. Then i got a code for the turbo boost sensor. So i replaced that. Now I'm getting simil"
— Chevrolet Malibu owner, 04/13/2023

Source: NHTSA Complaints Database

Most Reported Vehicles for P0239

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	CHEVROLET MALIBU

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0239: Turbocharger/Supercharger Boost Sensor B Circuit