What are the common causes of P039F?

A failed cylinder 2 pressure sensor. Damaged wiring or a connector at the cylinder 2 sensor. An open or short in the sensor 2 circuit. An ECM that cannot read the cylinder 2 signal. Corrosion at the cylinder 2 sensor connector.

Check the cylinder 2 pressure signal on a scan tool. Inspect the sensor 2 connector and harness for damage. Test the sensor 2 circuit for an open or short. Measure the sensor 2 resistance against spec. Replace the cylinder 2 pressure sensor if the circuit tests good. Clear the code and retest.

P039F

Cylinder 2 Pressure Sensor Circuit

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

What it means

P039F means Cylinder 2 Pressure Sensor Circuit.

Where it lives

For P039F, the circuit described runs through the sensor. The description of P039F puts it on cylinder 2.

Check these first

A failed cylinder 2 pressure sensor
Damaged wiring or a connector at the cylinder 2 sensor
An open or short in the sensor 2 circuit
An ECM that cannot read the cylinder 2 signal
Corrosion at the cylinder 2 sensor connector

What to do next

Check the cylinder 2 pressure signal on a scan tool
Inspect the sensor 2 connector and harness for damage
Test the sensor 2 circuit for an open or short
Measure the sensor 2 resistance against spec
Replace the cylinder 2 pressure sensor if the circuit tests good
Clear the code and retest

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Updated

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