What Does P0248 Mean?
The turbocharger wastegate solenoid B is not performing within expected parameters. The electrical circuit is functional but the wastegate B response does not match commanded positions. On twin-turbo systems, the secondary turbo's boost regulation is compromised. The driver may notice inconsistent power delivery at higher RPMs, turbo lag, or overboost/underboost from the secondary turbo.
Common Causes
30%
Carbon buildup or mechanical binding in the wastegate B valve or actuator
25%
Deteriorated or leaking vacuum hoses to the wastegate B actuator
20%
Degraded wastegate solenoid B with intermittent or sluggish operation
15%
Torn wastegate B actuator diaphragm
10%
Exhaust leak near the secondary turbo affecting pressure balance
Diagnostic Steps
1
Monitor live data for actual boost pressure vs. commanded boost during acceleration through the secondary turbo's operating range — note if boost overshoots, falls short, or oscillates.
2
Manually check the wastegate B actuator arm for smooth movement and proper spring return. The rod should move freely without excessive force or grinding.
3
Apply vacuum to the wastegate B actuator using a hand pump. It should hold 15 inHg for at least 30 seconds. Rapid vacuum loss indicates a torn diaphragm.
4
Inspect all vacuum lines between solenoid B and the wastegate B actuator. Heat from the exhaust can deteriorate rubber hoses over time. Replace with silicone vacuum hose rated for high temperature if needed.
5
Use scan tool bi-directional controls to command the wastegate solenoid B on and off while observing boost pressure changes. Compare response time to solenoid A as a benchmark.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The turbocharger wastegate solenoid B is not performing within expected parameters. The electrical circuit is functional but the wastegate B response does not match commanded positions. On twin-turbo systems, the secondary turbo's boost regulation is compromised. The driver may notice inconsistent p...
The most common cause of P0248 (Turbocharger Wastegate Solenoid B Range/Performance) is: Carbon buildup or mechanical binding in the wastegate B valve or actuator
Typical repair costs for P0248 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The secondary turbo wastegate is not responding correctly, creating a risk of overboost or underboost in the upper power band. Drive moderately and avoid situations requiring full power. If you notice excessive boost pressure or turbo surging, reduce throttle immediately and drive to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0248 to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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