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2004 Dodge 1500 6-Cylinder Repeated Cam Sensor Failure - Possible Timing Chain or DTC Misdiagnosis?

Model: 04 Dodge 1500 Fault Code: P0340 Posted: 2013-09-11 19:55

I own a 2004 Dodge 1500 with 2-wheel drive and a 3.7L 6-cylinder engine. I've replaced the camshaft position sensor twice within an 8-month period, and it's failing again. Given this recurring issue, I'm wondering if the problem could be caused by a worn timing chain or another underlying mechanical fault. Could the repeated failure of the cam sensor be due to incorrect cam timing? Or is there a possibility that the fault codes are being misinterpreted—such as a crankshaft sensor issue falsely triggering a cam sensor code? I've seen a strange symbol with up/down arrows and letters appear alongside the code, which I haven't encountered before. I previously purchased the sensor from AutoZone; however, I'm now considering switching to an OEM Dodge part due to concerns about aftermarket quality. The vehicle runs fine for approximately 6 months after replacement, then begins exhibiting symptoms again. Any insights into whether this is a genuine cam sensor issue or a symptom of another component failure would be greatly appreciated.

Related fault codes

P0340

Comments (3)

Anonymous 2013-09-12 10:36

Please share all the diagnostic trouble codes (DTCs) you're receiving. Remember: DTCs do not always indicate a direct part replacement — they may point to deeper issues. Are you using an OEM Dodge camshaft sensor? Aftermarket sensors have been known to fail prematurely and can lead to recurring faults. Is your vehicle stock configuration (no modifications or performance upgrades)?

Anonymous 2013-09-14 06:54

The last time I checked, the only code that appeared was a PO340-related code. However, it was accompanied by an unusual symbol — something like up/down arrows with one or two letters — which I’ve never seen before. I bought my previous sensor from AutoZone. This time, I’m considering going to the dealership for an OEM part. After replacement, the truck runs smoothly for about 6–8 months before symptoms return again. Thanks for the advice! I’ll try a genuine Dodge sensor and monitor performance over the next 6 to 8 months.

Anonymous 2013-09-15 14:45

You have the 3.7L engine in your 2004 Dodge 1500, correct? If you're consistently seeing a recurring PO340 DTC (camshaft position sensor), it's worth checking that cam timing is still accurate. Additionally, I strongly recommend using only OEM Dodge cam and crankshaft sensors — aftermarket parts can cause intermittent faults. Also note: many Mopar vehicles generate opposite DTCs. For example, a failing crankshaft sensor may trigger a camshaft sensor code (and vice versa), so it's important to verify the actual source of the fault before replacing components.