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P03F9

B Camshaft Position Actuator Position Sensor C Circuit High (Bank 1)

B Camshaft Position Actuator Position Sensor C Circuit High (Bank 1): the signal voltage is above the expected range. This relates to engine timing; a fault can cause rough running, a no-start, or timing errors.

  • 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.

  • Open signal lineCommon
  • Connector pins corroded - high contact resistanceLess likely
  • Supply wire pinched against B+ sourceLess likely

Parts involved

  • Camshaft Position Actuator

P03F9 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.