DTC P0340 - CAMSHAFT POSITION SENSOR CIRCUIT GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Camshaft Position (CMP) sensor is used to indicate camshaft position so that VCM can determine which cylinder is misfiring if misfire is present. CMP sensor also checks for properly installed high voltage switch.

Conditions for setting DTC

1. Engine running.
2. CMP sensor reference pulse is not seen once every 6 revolutions.