OBD B Camshaft Position Actuator Position Sensor B Circuit Bank 2
What it means
P2B4B stands for B Camshaft Position Actuator Position Sensor B Circuit Bank 2. P2B4B is a P code, so the fault sits in the engine, transmission and emissions systems. For P2B4B, work through the cause list below, cheapest checks first.
Where it lives
For P2B4B, the circuit described runs through the sensor. The description of P2B4B puts it on bank 2.
What to check first
For P2B4B, check the bank 2 reading against the other bank before buying parts, since if only one side is out of range that side is the fault.
Check these first
- P2B4B: Faulty or contaminated sensor in the fuel/air metering circuit
- P2B4B: Damaged or shorted wiring or connector for the affected circuit
- P2B4B: Vacuum leak or intake system restriction
- P2B4B: Failing fuel pump, injector, or fuel pressure regulator
What to do next
P2B4B belongs to the powertrain control system. These are the general steps for P2B4B, and the exact cause on your vehicle can differ.
- P2B4B: Read freeze frame data and related codes with an OBD-II scanner
- P2B4B: Inspect the affected sensor wiring and connector for damage
- P2B4B: Compare live sensor readings (fuel trim, airflow, temperatures) to manufacturer specs
- P2B4B: Smoke test the intake system if lean or vacuum conditions are suspected
- P2B4B: Replace the failed component after confirming it with live data
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.