What are the common causes of P236D?

A stuck or slow cylinder 12 pressure sensor. A cylinder 12 fuel injector not delivering a consistent pulse. A failed cylinder 12 pressure sensor element. A restricted cylinder 12 pressure sensor port.

Read cylinder 12 pressure variation on a scan tool. Compare cylinder 12 pressure to the other cylinders. Test the cylinder 12 fuel injector. Perform a compression test on cylinder 12. Replace the cylinder 12 pressure sensor if the other tests pass. Clear the code and retest.

P236D

Cylinder 12 Pressure Variation Low

System: Ignition and misfire (P code)
Lamp: Check Engine Light
Category: Powertrain - Ignition

What it means

P236D means Cylinder 12 Pressure Variation Low.

Check these first

A stuck or slow cylinder 12 pressure sensor
A cylinder 12 fuel injector not delivering a consistent pulse
A failed cylinder 12 pressure sensor element
A restricted cylinder 12 pressure sensor port

What to do next

Read cylinder 12 pressure variation on a scan tool
Compare cylinder 12 pressure to the other cylinders
Test the cylinder 12 fuel injector
Perform a compression test on cylinder 12
Replace the cylinder 12 pressure sensor if the other tests pass
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.