OBD Codes List

Diagnostic reference · P03BD

P03BD

Cylinder 5 Pressure Sensor Circuit

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

What it means

P03BD means Cylinder 5 Pressure Sensor Circuit.

Where it lives

For P03BD, the sensor sits on the circuit this code reports. The description of P03BD puts it on cylinder 5.

Check these first

  • A failed cylinder 5 pressure sensor
  • Damaged wiring or a connector at the cylinder 5 sensor
  • An open or short in the sensor 5 circuit
  • An ECM that cannot read the cylinder 5 signal
  • Corrosion at the cylinder 5 sensor connector

What to do next

  1. Check the cylinder 5 pressure signal on a scan tool
  2. Inspect the sensor 5 connector and harness for damage
  3. Test the sensor 5 circuit for an open or short
  4. Measure the sensor 5 resistance against spec
  5. Replace the cylinder 5 pressure sensor if the circuit tests good
  6. Clear the code and retest

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Updated

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