OBD-II code · Powertrain (generic, extended)

P264C A Rocker Arm Actuator Position Sensor Circuit Low Bank 1

The position sensor signal is below the lower diagnostic threshold. Usually a shorted sensor or short to ground in the harness.

Is it safe to drive with P264C?

Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.

Common causes

  • Most likelyInternal short in sensor element
  • PossibleSignal wire shorted to ground
  • Less likelyConnector pins corroded - high contact resistance

Repair at a glance

Difficulty
Medium
DIY friendly
Best left to a mechanic
Typical labour
0.8–3 h
Emissions test
Usually unaffected
Parts involved
Rocker Arm Position Sensor A B1, Wiring Harness

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.