GM OBD Trouble Code 17

Camshaft Position Sensor Error

The Camshaft Position sensor will signal the Engine Control Module when the #1 cylinder is ready for the spark plug to fire ("top-dead-center" on compression stroke). The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.

Fault Code Description


  • Extended cranking, possible no-start condition

Common Problems

  • Not all ignition systems use cam sensors. Those that do may have a distributor- or remotely-mounted sensor, depending on the application.
  • Ignition systems using a distributor and equipped with an cam sensor will normally have the sensor inside the distributor.
  • Systems without cam sensors will have a remotely-mounted sensor. In some cases, these cam sensors must be properly "timed" after installation.

Related Questions

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