From Kelly Blue Book:
What Are Some Causes of a P0236 Code?
The reason you’ll see this code is that the turbo boost pressure sensor, MAP sensor, and BARO sensors are not all giving the same reading. This can be for a variety of reasons, including issues with the sensor being contaminated or clogged, deteriorated with age, or not connected properly with its various wires. Issues with your vacuum or exhaust lines may also cause this code, as may a defective turbocharger itself.