P0236: Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance
Quick Answer
Not safe to drive
P0236 means the boost pressure sensor is producing a reading that does not make sense to the ECU, even though its voltage is still inside the normal range. The ECU checks it against the barometric and manifold pressure readings with the engine off, and against the boost it expects while driving; when they disagree it sets P0236. A faulty sensor is a common cause, but a boost leak, a contaminated sensing port or a turbo control fault can produce the same code. Most repairs cost between 40 and 200 euros.
- Severity
- Moderate · Fuel System
Up to €500, depending on your car.
A scan shows whether P0236 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P0236 mean?
P0236 is a fuel system-related diagnostic trouble code classified as moderate severity.
Where it is on the car
- Air filter
- Turbocharger
- Wastegate or boost control actuator
- Intercooler
- Boost pressure sensor
- Throttle, intake manifold and engine
What are the symptoms of P0236?
- Check engine light on
- Reduced power or limp mode, especially under acceleration
- Slow, flat acceleration because the ECU limits boost to a safe substitute value
- Black smoke under load on diesels if fuelling and boost no longer match
- Hissing or whooshing under boost if a charge pipe or intercooler hose is leaking
- Code returns soon after being cleared, often on the first hard acceleration
What causes P0236?
Faulty boost pressure sensor whose reading has drifted away from the real pressure
: high
Boost leak from a loose clamp, split hose or cracked intercooler, so measured boost no longer matches what the ECU expects
: high
Oil or soot clogging the sensor's sensing port in the charge pipe
: medium
Corroded connector or damaged wiring causing an unstable but in-range signal
: medium
Turbo control fault, such as a sticking wastegate or boost pressure actuator, making actual boost wander from the expected value
: low
Wrong replacement sensor fitted, with a pressure range that does not match the engine
: low
Is it safe to drive with P0236?
No - address this immediately. Once the ECU stops trusting the boost sensor it usually limits boost and power, and on many turbo diesels and petrols that means limp mode, which can arrive without warning under load. Drive gently to a workshop, avoid heavy throttle, towing and motorway merging at full load, and do not keep driving for weeks on a substitute value.
How do you diagnose P0236?
- Read all stored codes and the freeze frame. If P0299 or P0234 is stored as well, boost really did go wrong and the sensor may be reporting it correctly; if P0236 is on its own, the sensor or its wiring is the stronger suspect
- Switch the ignition on without starting the engine and compare the boost sensor, MAP and barometric readings. With no boost in the system they should all read atmospheric pressure, roughly 95 to 105 kPa at sea level, within a few kPa of each other. A generic OBD2 reader shows these where the ECU exposes them. A boost sensor that reads clearly higher or lower than the other two with the engine off is faulty or has a wiring problem
- Start the engine and watch the boost reading at idle, then under load on a road test. It should sit near atmospheric at idle and rise smoothly as you accelerate. A reading that jumps, drops out or stays flat while the engine clearly pulls points at the sensor or its connector
- Remove the sensor and inspect the sensing port and the tip. Oil sludge or soot blocking the port slows or distorts the reading, so clean it and check the charge pipe for heavy oil, which can point at crankcase breather or turbo seal problems
- Perform a boost leak test by pressurising the intake system with compressed air at 0.5 to 1 bar and listening or using soapy water at every clamp, hose and the intercooler
- Back-probe the connector with the ignition on. The reference should read about 4.5 to 5.2 V and the sensor ground within about 0.1 V of battery negative. Wiggle the harness while watching the live reading to catch an intermittent fault
- If the sensor, wiring and boost system all check out, have the wastegate or turbo actuator checked. Actuator tests need manufacturer-level software; a generic OBD2 reader cannot run them
How much does P0236 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Clean and reseat boost sensor connector, clean sensing port | €0–€10 | €0–€40 | €0–€50 | Easy |
| Replace boost pressure sensor | €20–€80 | €20–€60 | €40–€140 | Easy |
| Fix boost leak (tighten clamps, replace hose) | €10–€80 | €30–€120 | €40–€200 | Moderate |
| Repair boost sensor wiring or connector pins | €10–€40 | €60–€180 | €70–€220 | Moderate |
| Replace wastegate or boost pressure actuator | €60–€250 | €80–€250 | €140–€500 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P0236 on specific vehicles
P0236 on Volkswagen
Volkswagen Golf GTI 2.0 TSI
P0236 on Ford
Ford Fiesta ST 1.6 EcoBoost
Related diagnostic codes
Common questions about P0236
- What does P0236 mean?
- P0236 means the ECU does not believe the boost pressure sensor's reading. The voltage is inside the normal range, so the circuit is not open or shorted, but the pressure it reports does not agree with the barometric and manifold pressure readings with the engine off, or with the boost the ECU expects while driving. The ECU then usually limits boost and power until the fault is fixed.
- Is P0236 always a bad boost sensor?
- No. The sensor is a common cause, but the code only says the reading is implausible. A boost leak, oil clogging the sensing port, a corroded connector or a turbo control fault can all make a healthy sensor report a pressure the ECU does not expect. The quickest check is to compare the boost, MAP and barometric readings with the key on and the engine off: if the boost sensor disagrees there, the sensor or its wiring is at fault.
- Can I drive with a P0236 code?
- Only gently to a workshop. Many engines go into limp mode on this code, cutting power without warning under load, which makes overtaking and motorway merging unsafe. The ECU is also running on a substitute boost value, so fuelling and boost control are compromised. Get it checked within days.
- What is the difference between P0236 and P0238?
- P0236 is a range or performance fault: the sensor's voltage is normal but its reading does not make sense. P0238 is a circuit high fault: the voltage is stuck near the top of the scale, which usually means a wiring fault, an unplugged or failed sensor or a short to voltage. P0236 is more often a leak, contamination or a drifting sensor, while P0238 is more often electrical.
- How do I test a boost pressure sensor?
- With the ignition on and the engine off, the boost sensor should read the same as the barometric and MAP sensors, roughly 95 to 105 kPa at sea level. Then check the connector for corrosion, back-probe for a 5 V reference and a good ground, and watch the reading rise smoothly under load on a road test. A generic OBD2 reader shows boost or MAP readings where the ECU exposes them.
- How much does it cost to fix P0236?
- Cleaning the connector and sensing port can cost nothing beyond contact cleaner, or up to 50 euros at a workshop. A new boost pressure sensor costs 40 to 140 euros fitted, and fixing a boost leak 40 to 200 euros. Wiring repairs run 70 to 220 euros, mostly fault-finding time. If a sticking wastegate or boost pressure actuator is behind the code, a replacement actuator costs 140 to 500 euros.
Read our detailed guides
Sources
- wiki.ross-tech.com wiki.ross-tech.com/wiki/index.php/16620/P0236/000566
- fofiesta7.com fofiesta7.com/ford_fiesta_electronic_engine_controls_component_location_descript
- fofiesta7.com fofiesta7.com/ford_fiesta_turbocharger_boost_pressure_tcbp_and_charger_air_coole