Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Camshaft Position Sensor
The Hall Effect Camshaft Position (CMP) sensor produces 3 ON-OFF pulses for each revolution of the camshaft. CMP sensor is located below the water pump. See Fig 1 . The CMP output is pulse width encoded. The ECM uses the CMP sensor and Crankshaft Position (CKP) sensor output pulses to determine the engine speed and position. The CMP sensor is connected directly to the ECM by the 12-volt reference, low reference and CMP sensor signal. If ECM determines that the CMP sensor signal is out of range for less than 2 seconds, a DTC will set. To diagnose DTC, see SELF-DIAGNOSTICS - 6.6L SIERRA & SILVERADO - DIESEL article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.