Codes p1820, U1000, and P1808, engine cranks but will not start?

2012 NISSAN XTERRA
23,010 MILES
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ANDRIN ATEM
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Please, I am having this issue with my car, it won’t start but it cranks. I have these fault codes p1820 and U1000 as well as P1808. Please help me figure out how to repair this fault. I am a mechanic.
Jul 9, 2023 at 8:11 AM
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STRAILER
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The communication code will be the problem, the others are for non-essential engine performance issues.

I would start by checking the fuses here is a guide that can help, and I have included the fuse locations as well. If all fuses are good, I would swap out the ECM relay (the ECM relay maybe interrogated into the IPDM which might be bad).

https://www.2carpros.com/articles/how-to-check-a-car-fuse

U1000: This code signifies a communication problem between the ECM and another module on the vehicle's network.

P1820: This code is related to the transmission range sensor circuit malfunction.

P1808: This code relates to the transmission 4-wheel drive (4WD) mode select switch circuit.

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Jul 10, 2023 at 10:47 AM
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ANDRIN ATEM
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Thank you Ken, I let you know what I found.
Jul 10, 2023 at 10:51 PM
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STRAILER
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Please do, have a great day.
Jul 11, 2023 at 11:02 AM