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Good day! I am the proud owner of a 2015 BMW 320D with the B47 engine.

I have the error code:


273C00 or p0340 - Signal or no signal from the camshaft sensor

The voltage reduces when magnetised, therefore I changed the cam sensor just in case. I tested it outside of the vehicle. I replaced the wiring up to the 6-inch distance from the sensor because it was slightly brittle, but all of the wires tested negative for resistance.

It seems like everything is fine with the wiring to the ECU because the sensor is receiving 5 volts, the ground is good, and the supply is 5 volts. I have tested the pins on the ECU again and found that their resistance is less than 1 ohm.

The engine doesn't make a harsh noise or have a cold start rattle.

Does everything lead to timing chain, or does anyone have any other suggestions?

If the engine is still operating well, I would be amazed if the chain were the problem. Thanks to the changed sensor and verified wiring, it's looking more like an electronic problem. Is it possible that the ECU is at fault?
Scoping the sensor should be the next logical step.

I appreciate your response; I've been trying to figure this out for several nights now, and it's really driving me crazy. Like you said, it seems strange. I have a feeling that has previously been done because it runs pretty smoothly and only 172k. I'll have to get it tested.

Three years ago, I purchased a vehicle with the knowledge that it had issues; unfortunately, I can no longer recall the specific code for that concern.
The installation of a new sensor in the past had failed to resolve that specific issue.
To make a long story short, the individual responsible for installing the first sensor had accidentally removed the "O"ring from the old sensor's socket.

No guarantees, but it's worth taking a peek at the photo and giving it a poke.

Thank you. I will investigate that and verify it in detail.

Please keep us informed.