Codes P0021, P0345, U1000 and U1001, rattle noise on the engine?

The camshaft actuator can make the engine make a noise and do go out, but can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

The Diagnostic Trouble Codes (DTCs) you've provided are from the onboard diagnostic system of your 2005 Nissan Pathfinder. Each code indicates a specific issue or malfunction within different systems of the vehicle. Here's what each code represents:

P0021: This code refers to a problem with the "A" camshaft position - timing over-advanced or system performance (Bank 2). This could be related to issues with the camshaft position sensor, the variable valve timing system, or the timing chain/belt.

P0345: This code indicates a problem with the camshaft position sensor "A" circuit (Bank 2). The camshaft position sensor is crucial for proper engine operation and timing. A malfunction in this sensor's circuit can affect engine performance.

U1000: This is a network communication code. It indicates a problem in the communication network between various control modules in the vehicle. This could be due to issues like a bad connection, damaged wiring, or a faulty control module.

U1001: Similar to U1000, this code also points to a communication issue in the network between control modules.

The presence of both "U1000" and "U1001" codes often suggests a problem in the vehicle's communication network, which can result in various modules not being able to communicate effectively with each other. This can make diagnosing other issues (like the P0021 and P0345 codes) more challenging, as communication between modules is essential for proper diagnostics.

Let it be known that if the timing chains are off, they will make noise as well. Here are the camshaft timing oil control valves to make sure you replaced the correct one. Check out the images (below). Please let us know what happens.

The computer should do that via the oil control valve. Try clearing the codes and driving it.

The engine noise seems like the timing chain guide is broken or you have a broken piston. Also, the P0021: timing over-advanced or system performance (Bank 2) seems like the camshaft timing is off. Can you please recheck it?

Yes, I noticed the -9 that's why I wanted you to recheck the timing. Have you done a compression test? If the engine is not good the readings will never be correct. The engine noise has me concerned as well, are the camshaft lobes okay?

It sounds like you're dealing with a specific issue related to the timing and valve parameters on a 2005 Nissan Pathfinder. It's important to clarify that diagnosing specific vehicle issues can be complex, and having access to the vehicle and its diagnostic data would be essential for a precise diagnosis. That said, I can provide some general insights based on the information you've provided.

Timing and Valve Parameters: The values you've mentioned (-9, -8.00, 56, 27.50) seem to be related to the inlet valve timing and parameters for different banks of the engine. It's not clear from your description what these values represent exactly, but they likely correspond to specific measurements or readings from the engine control module's diagnostics. The fact that you're observing different values between bank 1 and bank 2 could indicate a potential issue with the timing or valve parameters on one of the banks.

Fault Codes and Timing: It's interesting that you mention a difference in fault codes between bank 1 and bank 2. Inlet valve timing issues could lead to poor engine performance, misfires, and possibly noise. If bank 2 is showing a fault code for inlet valve timing and bank 1 is not, it could indicate that bank 2 is experiencing a timing-related problem.

Stretched Timing Chain: A stretched timing chain can indeed lead to timing misalignment, and it's known to cause a variety of engine-related issues. A stretched chain can lead to poor valve timing, which in turn affects engine performance and can cause noise and misalignment. If the chain is stretched beyond its acceptable limits, it can lead to irregular valve opening and closing, potentially triggering fault codes and affecting engine operation.

Sure, here you go. Check out the images (below). Please let us know what you find.

Can you upload images so I can see what's going on?

Thanks for getting back to us on this, you are correct the bank2, so you need to replace VVT actuator.