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.
Code 17 - Camshaft Sensor Error (3.1L CALIF. "W" Body): Notes
Camshaft sensor is a Hall Effect switch located on the front of the engine. Sensor sends signals to the ECM when cylinder No. 1 is on the intake stroke. Signal is used by ECM to synchronize sequential fuel injection. If cam signal is not received by ECM, ECM will pulse fuel injectors sequentially, but the fuel injectors may not be in sync with each intake valve opening. A loss of this signal, or any extra signals (false signals), at engine speeds greater than 500 RPM will cause ECM to set a Code 17.
- ECM performs a test for Code 17 when the engine is running or cranking. Code 17 will set when a cam pulse is missing on the first pass through the internal ECM self-test of the camshaft position sensor, or a cam pulse is missing for 3 seconds.
- By repeatedly tapping the starter, camshaft timing mark and camshaft position sensor will align with each other. At this point, voltage from sensor to ECM should drop to near zero volts temporarily. This indicates the camshaft sensor is capable of sending a signal to the ECM.
- Before replacing camshaft position sensor, inspect sensor for proper installation.
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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.
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