P056F — Cold Start Turbocharger/Supercharger Boost Control B Performance

What Does P056F Mean?

P056F is a diagnostic trouble code indicating: Cold Start Turbocharger/Supercharger Boost Control B Performance. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P056F

⚠️ Check Engine Light (MIL) illuminated
⚠️ Cold Start Turbocharger/Supercharger Boost Control B not meeting expected output
⚠️ Degraded performance of related system
⚠️ Erratic idle speed

Common Causes

🔍 Cold Start Turbocharger/Supercharger Boost Control B degraded from age or contamination
🔍 Mechanical wear in Cold Start Turbocharger/Supercharger Boost Control B or related parts
🔍 Restriction or blockage affecting Cold Start Turbocharger/Supercharger Boost Control B
🔍 Calibration drift in Cold Start Turbocharger/Supercharger Boost Control B

Frequently Asked Questions

What does P056F mean?

P056F indicates: Cold Start Turbocharger/Supercharger Boost Control B Performance. The vehicle's computer has detected that the Cold Start Turbocharger/Supercharger Boost Control B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P056F?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P056F for extended periods may cause additional problems.

How much does it cost to fix P056F?

Repair costs for P056F typically range from $50 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Cold Start Turbocharger/Supercharger Boost Control B for contamination or wear
🔧 Replace Cold Start Turbocharger/Supercharger Boost Control B
🔧 Address any related mechanical faults

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.

P056F: Cold Start Turbocharger/Supercharger Boost Control B Performance