P0248
Turbocharger Wastegate Solenoid B Malfunction
Powertrain Emission Controls Turbo boost control 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The turbocharger's wastegate solenoid B is not working properly, preventing the engine from controlling boost pressure correctly. Think of it like a pressure valve that's stuck or broken—the system can't regulate exhaust flow smoothly.

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Symptoms You May Notice
3 known symptoms for this code
Check engine light illuminated
Reduced engine power or limp mode activation
Excessive boost pressure or turbo lag
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the wastegate solenoid B's electrical resistance and response time to control boost pressure regulation. It sends a duty-cycle signal to the solenoid and expects a corresponding change in boost pressure feedback from the MAP sensor. If the solenoid fails to respond or shows resistance outside normal range, the fault is triggered.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Solenoid Resistance 4–14 ohms Open circuit or >20 ohms
Boost Pressure Response Proportional to duty cycle No change or erratic response
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wastegate solenoid connector
Clean corrosion and inspect for loose or damaged pins; reseat firmly.
2
Wastegate solenoid B
Remove bolt(s) and replace with OEM part, then clear code and test.
3
Turbocharger hoses and lines
Inspect for cracks, loose clamps, or vacuum leaks affecting solenoid operation.