Turbo/Supercharger Boost Control Module Performance
The boost control module is not performing as expected.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer is seeing unexpected boost pressure values from the turbo or supercharger system. If the boost pressure is too low or too high, it can cause poor engine performance and increased emissions.
What the computer is actually seeing
The engine control module monitors boost pressure from the turbo or supercharger through a sensor, which should ideally show a boost pressure that matches the desired level set by the ECU. It may see values too low (below 10 inHg at wide open throttle) or too high (over 30 inHg), or it may see fluctuations outside normal ranges.
What a healthy reading looks like
At wide open throttle, you should see boost pressures typically around 15 to 30 psi depending on the system. Any readings lower than 10 inHg or inconsistent readings can trigger this code.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the wiring and connectors for the boost pressure sensor for corrosion or damage.
- 2Inspect vacuum lines for leaks—replace any that are cracked or disconnected.
- 3Using a scan tool, check the actual boost pressure reading against the desired boost pressure during operation. They should be within 2 psi of each other.
- 4If the boost pressure sensor reading is out of bounds, replace the sensor and clear the code to retest.
- 5If boost pressure is still not correct, inspect the turbocharger or supercharger for mechanical issues or wastegate operation.
Common causes
- Faulty turbocharger/supercharger
- Worn or damaged wastegate
- Boost pressure sensor failure
- Vacuum leaks in the intake
- Wiring issues in the boost control circuit
Typical repair cost
$150 - $1200
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not safe to drive aggressively, as reduced power can occur. It's better to fix it soon.
Will this code come back after a repair?
If the root cause is fixed correctly, it shouldn't come back, but keep an eye on performance.
Why do I see this code alongside another code?
If multiple issues are affecting boost control, they can trigger several codes at once.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →