P0236: How to Diagnose & Fix — Turbocharger Boost Sensor A Circuit Range/Performance
2 vehicles · 1 makes · $80-$4,500 repair
How to diagnose and fix P0236: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford Transit · 2015–2024
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.
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
- Oil leak from turbo drain or feed lines
- Burning oil smell from engine bay
- Reduced fuel economy
How to Fix
For wastegate actuator failures (most common turbo issue): replacement of the actuator alone ($200-400) may resolve boost control issues without full turbo replacement. For internal turbo bearing failure or impeller damage, complete turbo replacement is required. RepairPal estimates $1,650-2,210 for turbo assembly replacement. For Transit commercial vehicles, change oil every 5,000 miles (not the factory 10k interval) and allow 30-60 seconds of idle time before shutdown after sustained driving to allow turbo bearing oil to circulate. Never shut off a hot turbocharged engine immediately after towing or hard driving.
Sources for this issue (1)
Ford Transit · 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.
Common Symptoms
- Noticeable reduction in engine power or sluggish acceleration
- Check engine light with boost-related fault codes
- Excessive black smoke from exhaust under load
- Turbo appears to not build boost pressure
- Poor fuel economy compared to baseline
How to Fix
Replace the boost pressure/MAP sensor located on the intake manifold. Ford part number for the 2.0L EcoBlue MAP sensor is approximately 2 235 233 (or Motorcraft DY-1297). Clearing the fault and re-testing boost response is required after replacement. ECM recalibration via Ford FDRS may be needed if a learned adaptation table has been skewed by the faulty sensor data.
Sources for this issue (1)
Ford Bronco Sport · 2021–2024
Owners of 1.5L three-cylinder Bronco Sports report turbocharger failures that begin with a seized or binding wastegate actuator rod (in some cases a missing actuator e-clip). Because the actuator can no longer regulate boost, the vehicle throws P0299 (underboost) and drops into limp mode. In more advanced cases the turbine wheel itself lets go and forum members have found turbine debris downstream in the catalytic converter, which turns a turbo job into a turbo-plus-cat job. Failures are commonly reported in the 60,000-80,000 mile window - just past the 60k/5-year powertrain warranty - so owners frequently pay out of pocket. A handful of threads describe the P0299 code returning shortly after a turbo replacement, suggesting oil supply and post-repair oil-feed cleaning matter to the fix.
Common Symptoms
- Sudden loss of power / limp mode
- Check engine light with P0299
- Whistling or siren-like noise from turbo
- Blue or white smoke from exhaust
- Oil in the charge piping
- Rattling metallic noise under boost
How to Fix
Scan and confirm P0299/P0234 rather than assuming a boost leak. Inspect the wastegate actuator rod for free travel and confirm the e-clip is present; a seized actuator with an otherwise healthy cartridge can sometimes be addressed by actuator replacement. If shaft play, oil in the charge pipe, or metal in the intercooler/cat is present, the turbocharger assembly must be replaced and the oil feed line and pickup screen cleaned or replaced to avoid a repeat failure. Inspect the catalytic converter for ingested turbine debris before returning the car to service. Ford has covered some of these under extended coverage or goodwill - ask the dealer to file for assistance if just out of warranty.
Sources for this issue (3)
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P0236 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 P0236 mean?
P0236 stands for "Turbocharger Boost Sensor A Circuit Range/Performance." This code indicates a range or performance problem with turbocharger (or supercharger) boost pressure sensor 'A', the sensor that tells the engine computer how much boost the forced-induction system is producing. The computer compares the sensor's reading against expected values for the current engine load and conditions, and sets this code when the signal is implausible or doesn't track properly. It usually means the boost reading is unreliable rather than completely missing, which can cause reduced power, poor throttle response, or limp mode. The fault can lie in the sensor itself, its wiring, or in actual boost-related problems like leaks.
What are the most common causes of P0236?
The most common causes of P0236 are: Faulty boost (MAP/charge) pressure sensor, Boost leak from a cracked or loose intercooler hose or pipe, Wiring or connector fault at the boost sensor, Clogged or kinked sensor reference hose, Failing turbocharger or wastegate not producing correct boost, Intake or vacuum leak affecting pressure readings, Carbon or oil contamination on the sensor element. The specific cause varies by vehicle.
How much does it cost to fix P0236?
Repair costs for P0236 range from $80 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P0236?
Au7o has documented P0236 across 2 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.