P2578 — Turbocharger/Supercharger Speed Sensor A Circuit

What Does P2578 Mean?

P2578 is a diagnostic trouble code indicating: Turbocharger/Supercharger Speed Sensor A Circuit. This code relates to the powertrain system. It has been reported in NHTSA complaints across 1 different vehicle models.

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I was driving and all of a sudden could not go over 30 miles an hour. I took it 3 dealerships 1 including a Ford Dealership. What I have been told is that there have been many issues with this type/manufacturer of transmission. The diagnostic codes that are coming out when being run are P072C P2832"
— Ford Focus owner, 08/04/2022

Source: NHTSA Complaints Database

Most Reported Vehicles for P2578

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD FOCUS

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
🔧 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.

P2578: Turbocharger/Supercharger Speed Sensor A Circuit