← Back to list

2004 Monte Carlo No Cam Signal, Code P0341: Diagnosis and Fix Guide

Model: 2004 Monte Fault Code: P0341 Posted: 2018-11-29 21:22

A 2004 Monte Carlo owner reports no camshaft position signal despite the engine starting and running. The vehicle displays Diagnostic Trouble Code (DTC) P0341, indicating a camshaft position sensor circuit issue. The camshaft position sensor uses a Hall effect design that requires both power and ground to function. It generates a 12-volt pull-up square wave signal sent back to the Powertrain Control Module (PCM). A key diagnostic step is performing a short-to-ground test using an ohmmeter: disconnect both the cam sensor connector and the PCM connector, then connect one probe of the digital multimeter to the signal wire and the other to battery negative. If the reading shows less than 'OL' (open loop) on the mega-ohm scale, it indicates a short to ground. Additionally, verify continuity between the two ends of the sensor wiring: one probe at each end should show resistance under 2 ohms for an open circuit. The PCM and Hall effect sensor are internally protected against shorts or power faults, so if the issue persists, the fault likely lies in external wiring or components. A ground-to-ground voltage drop test should be performed to confirm proper grounding — a simple test light is insufficient. For accurate diagnostics, using an oscilloscope (such as a PicoScope) is highly recommended to observe signal waveforms and detect intermittent faults. Possible causes of DTC P0341 include: - Incorrect harness routing near ignition components - Ignition coil arcing or damage (check for cracks or carbon tracking) - Damaged camshaft reluctor wheel - Sensor contact with the reluctor wheel - Foreign material between sensor and reluctor - Excessive camshaft end-play Before replacing parts, inspect the area around the cam sensor for debris or physical damage. Shine a bright light through the sensor housing while rotating the engine to check for visible damage on the reluctor wheel. In this case, the user initially suspected a faulty PCM but later discovered that the wiring harness was incorrectly configured — specifically, the ground and signal wires were swapped. This error caused no signal despite proper installation of the original cam sensor. The root cause was a simple wiring mistake, not a component failure. This thread serves as a valuable reference for others facing similar issues with P0341 on 2004 Monte Carlos. Proper diagnostic procedures and attention to detail are essential when troubleshooting engine signal faults.

Related fault codes
P0341
Comments (10)
Anonymous 2018-12-01 02:01

While the engine is running, I get a signal when I briefly touch the cam sensor signal wire with a test light. This confirms that the plug and wiring from the sensor to the PCM are intact. After reinstalling the original cam sensor, the issue persists — now I'm completely stumped on what could be causing it.

Anonymous 2018-12-01 08:43

DIAGNOSTIC AIDS: Common causes of DTC P0341 include incorrect harness routing near ignition components, arcing in ignition coils (check for cracks or carbon tracking), damaged reluctor wheel, sensor contact with the wheel, foreign material between sensor and reluctor, or excessive camshaft end-play. Since the PCM performed a bypass test, it's likely that either the reluctor wheel is damaged or there’s an external issue affecting the signal. An oscilloscope would be invaluable here — especially for detecting intermittent faults. Were any timing components recently replaced?

Anonymous 2018-12-01 09:13

Check if there's any debris on the cam sensor or visible marks on the reluctor wheel. Use a bright light and rotate the engine to inspect the area between the sensor and the reluctor wheel for damage.

Anonymous 2018-12-01 11:03

I can't believe it — I had the wiring plug connected incorrectly! The ground and signal wires were swapped. Even though I installed each wire one at a time, I must have made a mistake. This is such a simple error that it completely explains the lack of signal. Thank you for your help — this has been incredibly useful. Do you have PayPal or could you PM me your address so I can express my gratitude?

Anonymous 2018-12-01 11:40

No problem at all — glad you found a solution! This is a great lesson in attention to detail. Everyone makes mistakes, and this one will serve as a reminder for future repairs. You just learned something valuable from your own error.

Anonymous 2018-12-01 14:31

Exactly — that’s how we learn best. Thanks again! This thread is going down in history as a go-to resource for P0341 troubleshooting on 2004 Monte Carlos. It's rare to find such clear, actionable advice online.

Anonymous 2018-12-01 14:34

I was looking for a way to update the thread title to include 'P0341' to improve search visibility — but I couldn't edit it far back in time.

Anonymous 2018-12-01 18:54

I’ve now edited the original post title to include 'P0341', which should help with Google searchability for users looking up this specific fault code.

Anonymous 2018-12-01 22:37

Anonymous 2022-08-31 23:07

This helped me a lot — I replaced the cam sensor but used the wrong wire schematic in my pigtail, which caused the issue. If possible, detailed wiring diagrams or wire codes for this model would be extremely helpful.