A P0236 on the 6.7L Power Stroke indicates the turbo boost (MAP) sensor performance is out of range, so the computer cannot trust the boost reading.
What P0236 means
Turbocharger Boost Sensor A Performance is a diagnostic trouble code set when the monitored value falls outside its expected range. On the 6.7L Power Stroke, it narrows the problem to a specific system, and reading it correctly prevents replacing good parts.
Common causes
- Failed boost/MAP sensor
- Soot or oil contamination on the sensor
- Boost leak causing readings that disagree with expectation
- Wiring or connector faults
Symptoms you may notice
- Low power or hesitation
- Excess smoke under load
- Check-engine light
- Related boost codes
How to diagnose it
Compare the boost sensor reading against commanded and expected values, and inspect the sensor for contamination. A sensor reading that disagrees with reality, or is erratic, points at the sensor; a genuine boost problem shows a consistent shortfall.
How to fix it
Clean or replace the boost sensor as needed and repair wiring faults. If the sensor is accurate and boost is genuinely low, diagnose the turbo and charge-air plumbing instead. Clear and verify.
Frequently asked questions
What does the boost sensor do?
It measures manifold boost pressure so the computer can control fueling and the turbo. A faulty signal sets P0236.
Sensor or real boost problem?
Compare the reading to expected boost. An erratic or contaminated sensor points to the sensor; a consistent shortfall points to a boost problem.
Can soot cause it?
Yes. Soot or oil contamination on the sensor can skew its reading and set this code.
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