P0238 on Ford: How to Diagnose & Fix
Turbocharger Boost Sensor A Circuit High
1 Ford model · 1 documented issue · 1 critical · $1,200-$3,500 repair
P0238 on Ford by model: symptoms, diagnosis and fix
The Ford Transit 350/350 HD with the 3.5L EcoBoost twin-turbocharged V6 experiences turbocharger failures from inadequate lubrication, carbon buildup in the turbo housings, wastegate actuator failure, and turbo bearing wear.
Common Symptoms
- Loss of power or reduced boost
- Excessive turbo lag (slow boost response)
- Whistling, whining, or grinding noise from turbo area
- Excessive blue or black smoke from exhaust
- Check engine light with boost-related codes
How to Fix
For internal turbo bearing failure or impeller damage, complete turbo replacement is required. Never shut off a hot turbocharged engine immediately after towing or hard driving.
Sources for this issue (2)
P0238 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0238 mean on a Ford?
P0238 stands for "Turbocharger Boost Sensor A Circuit High." This code sets when the turbocharger (or supercharger) boost pressure sensor 'A' reports a voltage that's higher than the normal operating range. That sensor tells the computer how much boost the engine is making so it can manage fuel, timing, and the wastegate. A reading that's too high usually means an electrical problem in the sensor or its wiring rather than dangerously high actual boost, though the computer may reduce power as a precaution. It generally points to a sensor, wiring, or connection fault in the boost-monitoring circuit. On Ford it is documented across 1 model: Transit.
What are the most common causes of P0238?
The most common causes of P0238 are: Faulty turbocharger boost pressure sensor, Wiring shorted to voltage or to another high-signal wire, Corroded or damaged sensor connector, Open or high-resistance ground for the sensor, Disconnected or blocked boost pressure reference hose, Failed reference voltage circuit in the ECM/PCM. The specific cause varies by vehicle.
How much does it cost to fix P0238 on a Ford?
Published repair estimates on Ford range from $1,200 to $3,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.