P0238 on Ford
Turbocharger Boost Sensor A Circuit High
P0238 on Ford vehicles indicates turbocharger boost sensor a circuit high. Au7o has documented this code across 1 Ford model — most commonly on Transit. 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. Typical repair costs on Ford range from $80 to $3,500, depending on the specific model and root cause.
Common Causes of P0238
- •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
P0238 on Ford by Model
Ford Transit(2 issues)
- 3.5L EcoBoost Twin Turbocharger Failure2015-2024
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. OMS AutoParts and Autodoc document common Transit turbo problems including loss of power, turbo lag, unusual whistling/whining/grinding noises, and excessive smoke. The commercial use of Transit vans (frequent stop-and-go, high idle hours, heavy loads) accelerates turbo wear beyond what passenger vehicle applications typically experience. FordTransitUSAForum.com documents a case of turbo and manifold failure at 38,000 miles on a 3.5L EcoBoost Transit 350. RepairPal estimates turbocharger assembly replacement between $1,650 and $2,210 depending on the Transit model variant.
- Turbocharger Boost Pressure Sensor / MAP Sensor Failure (2.0L EcoBlue)2020-2023
The 2.0L EcoBlue diesel Transit has a documented pattern of boost pressure sensor and manifold absolute pressure (MAP) sensor failures, causing incorrect boost readings fed to the ECM. When the sensor fails or reads out of range, the ECM defaults to a conservative fueling map, reducing power significantly and triggering a check engine light. This issue is noted in multiple European market TSBs and has been replicated in North American Transit owners' forums with the same engine.
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View P0238 across all makes →Frequently Asked Questions
What does P0238 mean on 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 specifically, this code is documented across 1 model.
What causes P0238 on Ford vehicles?▼
Common causes on Ford: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0238 on a Ford?▼
Repair costs on Ford range from $80 to $3,500, depending on the specific model and root cause.
Which Ford models have P0238 documented?▼
Au7o has documented P0238 on 1 Ford model: Transit.