Where Is the Camshaft Position Located in a Buick?

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The camshaft position, or CMP, sensor on your Buick is located on the front side of the engine near the timing chain. Depending on your particular vehicle, you might need to look under the power steering pump or behind the serpentine belt.

Location

  • You may find the CMP sensor on top of the engine, hiding between the cylinder heads and next to the front cover. It may also be above the crankshaft harmonic balancer, mounted on the engine block or any place in between these two points on the engine front.

Function

  • The powertrain control module, or PCM, on your Buick receives electrical pulses from the camshaft position sensor to manage fuel injection operations and diagnose cylinder misfire conditions.

Trouble Codes

  • When the PCM receives an incorrect number of pulses from the camshaft sensor, it triggers a Diagnostic Trouble Code, or DTC, and stores it inside its memory.

Symptoms

  • A faulty signal from the camshaft position sensor, due to a bad electrical connection or component, may cause several symptoms, including intermittent rough running, unstable idle, poor fuel economy and stalling on acceleration.

Replacement

  • Depending on your vehicle year and model, you may have to remove the power steering pump or serpentine belt, unplug the sensor and unscrew the single mounting bolt to remove old unit and install the new sensor.

References

  • Buick, Oldsmobile and Pontiac Full-size Models 1985 thru 2005 Haynes Repair Manual; Mike Stubblefield and John H Haynes; 2006
  • Modern Automotive Technology; James E. Duffy; 2003
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