jenniferhoffmann1
Monza Camshaft Sensor Failure
Summary of the thread
A 2022 Chevrolet Monza with 80,441 km is experiencing poor starting, stalling at idle, and an illuminated check engine light, suspected to be due to a camshaft sensor failure caused by a defective encoder wheel. The symptoms suggest a sensor or engine control issue, and checking the wiring and fault codes with an OBD2 reader is recommended. The camshaft sensor is typically located near the top of the engine, around the valve cover, but professional diagnosis is advised to prevent further issues. The problem was confirmed to be a defective encoder wheel, which was replaced, resolving the issue.
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4 comment(s)
jenniferhoffmann1 (community.author)
No obvious misfires, just the stalling. I'll inspect the wiring, but where exactly is the camshaft sensor located on this engine? I'm not entirely sure where to look.
vincentherrmann91
Okay, no misfires is useful information. As for the camshaft sensor location, it varies but is usually near the top of the engine, somewhere around the valve cover. Trace the camshaft from the timing belt or chain cover; the sensor should be close to the camshaft pulley or sprocket. Given your symptoms and uncertainty about location, it might be best to have a workshop diagnose it to avoid potential further issues. I suspect the encoder wheel may need replacing too.
jenniferhoffmann1 (community.author)
Thanks for the advice. I took it to a workshop; encoder wheel was indeed defective. Repair cost was 695€, but the issue is resolved.
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CHEVROLET
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MONZA
vincentherrmann91
That does sound like a camshaft sensor issue. Is the engine misfiring at all, or running rough besides the stalling? Have you checked the wiring to the sensor itself for any obvious damage or loose connections? It could be something simple, but those symptoms definitely point towards a sensor or related engine control problem. Replacing the sensor is relatively easy, but it would be wise to check the fault codes with an OBD2 reader first to be certain.