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P2B4B

B Camshaft Position Actuator Position Sensor B Circuit Bank 2

The position sensor B of the camshaft position actuator on the exhaust side of bank 2 reports a circuit condition. Cam phasing position cannot be measured reliably.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Symptoms

  • Check engine light on
  • Power loss especially in mid-rpm range
  • Possible rough idle or stalling
  • Increased fuel consumption

Common causes

Ordered by how often each turns out to be the cause.

  • Position sensor failedCommon
  • Wiring or connector faultPossible

Parts involved

  • B Camshaft Position Actuator Pos Sensor B B2
  • Wiring Harness
  • ECM

P2B4B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.