OBD-II Code · Sensors
P0236
Turbo Boost Sensor A Range/Performance
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$150–$400
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Boost sensor out of range.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Reduced power
Likely causes
- Failed sensorMost common
- Clogged reference tube
Read the full diagnostic procedureP0236 means the boost pressure sensor reading is out of range or does not correlate with other inputs, typically detected when the ECM compares boost…
P0236 means the boost pressure sensor reading is out of range or does not correlate with other inputs, typically detected when the ECM compares boost pressure against throttle position, MAF airflow, and commanded boost and finds an implausible relationship.
Cheapest first
- at key-on-engine-off, verify the boost sensor reads atmospheric pressure (roughly 14.5 to 14.7 psi at sea level, lower at altitude); a reading more than 1 psi off atmospheric indicates the sensor is drifting.
- Compare boost sensor reading at idle to the MAP sensor reading (if equipped separately); they should agree within 0.5 psi at idle vacuum.
- Look for vacuum or pressure leaks in the line that supplies the sensor: a cracked silicone line or loose hose clamp on the charge pipe will give a low reading under boost and set P0236.
- Smoke-test the intake tract from the turbo outlet to the throttle body; even a 1/8 inch crack in an intercooler hose or boot will be visible and will trigger this code under load.
- Caveat: a slipped or partially clogged DPF on diesel applications can cause boost reading anomalies that mimic sensor performance faults.
Vehicle-specific patternsFord 6.0L Power Stroke (2003-2007) sees P0236 from carbon-fouled MAP sensors and cracked intercooler hoses.
- 2003-2007Ford 6.0L Power Stroke sees P0236 from carbon-fouled MAP sensors and cracked intercooler hoses.
- 2011-2016GM Duramax LML 6.6L sets P0236 from boost sensor fouling caused by EGR soot, addressed in GM Bulletin 13-06-04-007.
- 2008-2021Subaru WRX and STI EJ255/EJ257 sees P0236 from cracked intercooler Y-pipes and silicone couplers, a common modding-induced fault. Volvo T5 and T6 (2003-2016 S60, XC90) sets P0236 from PCV system failure flooding the boost sensor with oil.
Estimated repair$40 to $600.
Look up another code
P0236 — frequently asked
What does a P0236 code mean?
Boost sensor out of range.
What causes a P0236 code?
Common causes: Failed sensor; Clogged reference tube.
What are the symptoms of a P0236 code?
Typical symptoms: Check engine light; Reduced power.
Is it safe to drive with a P0236 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $150-$400.
How do I diagnose a P0236 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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