No crank, code P180C

Tiny
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Okay. That is great information. That would make sense if this started after that.

Clearly everything else is checking out so that would fit. What was the reason for replacing that? If you still have it, just put that part back in and see if this issue goes away. Clearly you will still have the issue that you replaced that part for but if this is gone then you know that was the issue.
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Monday, November 22nd, 2021 AT 4:00 PM
Tiny
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The owner said that the steering feels strong that was his reason for replacing it.
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Monday, November 22nd, 2021 AT 10:45 PM
Tiny
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Okay. Great. At least there were no issues that would prevent it from being used for testing.

Do they still have the part, and can you swap it out to see if the current issue goes away? That is going to be the quickest and easiest way to find out what this issue is because they are not the easiest to figure out.
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Tuesday, November 23rd, 2021 AT 6:51 AM
Tiny
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Do they still have the part? Yeah, I have the old steering.
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Tuesday, November 23rd, 2021 AT 12:44 PM
Tiny
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Okay. If you are willing to reinstall it, let us know what happens. Thanks
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Wednesday, November 24th, 2021 AT 7:24 AM
Tiny
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Good evening, friend!
Thank you so far, but please I want you to help me and analyze this.
From the picture below, I check ignition voltage on ECM Connector X1(LAF )51 using test lamp and it illuminated brightly. I also check battery voltage to ECM on XI(52) and it illuminate brightly. Then I further check X1(62) for ignition voltage using test lamp it didn't illuminate, I also checked X1(73)for ignition voltage, but no way it didn't, what could cause?
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Wednesday, November 24th, 2021 AT 2:24 PM
Tiny
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Both of these circuits are powered through separate fuses and then a single relay that is controlled by the ECM.

So, the way this works is when the ECM wants to power these ignition circuits, it grounds the relay from X1 pin 72. It provides ground on this circuit, so you need to check that by putting your test light on battery positive and then this terminal and if the light comes on then the ECM is grounding that relay.

If that is the case, then either both fuses are blown, or the relay is not closing.

Let me know if this does not make sense because it is important to test it properly or you will get false results.
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Thursday, November 25th, 2021 AT 7:33 AM
Tiny
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Okay, thank you once again.
I still want to ask, is there a way I can test power steering module to see if it was the problem since my scanner cannot be able to scan communication BUS to see the module that is not communicating?
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Thursday, November 25th, 2021 AT 1:40 PM
Tiny
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The only way to do it is using the wiring diagrams I provided before and the instructions on measuring voltage going to and from each of those modules on the communication circuit.

If you didn't have the issue before with the other part, then I would take the time to change it. It is the most definitive way to determine if that is the issue which I suspect it is. Any time you change a part and have a new issue, you need to immediately suspect the new part is faulty.
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Thursday, November 25th, 2021 AT 6:04 PM
Tiny
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Hello!

Thank you for your assistance so far, I had done the test with the older part (power steering assembly) and old ECM, lo and behold the u0100 (communication issue) is gone and only left with p018c (fuel pressure sensor "b" circuit low). Again, the key light is blinking continuously to show if there's immobilizer problem which my scanner was unable to read because the vehicle was not among on the list that supports enhanced diagnostics. Please send me the diagram to troubleshoot the fuel pressure sensor.
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Friday, November 26th, 2021 AT 5:45 PM
Tiny
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Okay. That is great however, if you replaced both the steering assembly and ECM we don't know what is causing that issue.

When we are doing something like this, you always want to only replace one part at a time so that we know what was causing the issue.

However, at this point, I would suggest just going through the testing as the vehicle sits and then repair what you find with that testing.

I attached it below.
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Saturday, November 27th, 2021 AT 12:25 PM
Tiny
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Hello!
Thank you once again.
Yesterday I did a lot of testing starting from putting the old ECM and power steering module, and I diagnosed the vehicle, and it stated as follows:
1. Stored fault -p018c
2. Pending fault- p018c and u0100
Permanent fault- p0602, p0606, p018c and p062f.
Then I disconnected the old ECM and put the New ECM and diagnosed it, it displays the same code and added B3055 (No transponder modulation).
At this point I said let me disconnect the ECM and try to connect without ECM and to see if it can communicate, as I disconnect the ECM, the Check Light went off and I connect, it connected, and I scanned it still display all those codes. At this point I was confused and said this is not the problem of ECM or power steering but BCM. Then I used another scanner to scan, and it display as follows, look at the pictures below, the first picture was when I changed the 2 ECM and scanned. The second, third, fourth and fifth was when I disconnected the ECM entirely and scanned only the BCM with another scanner.
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Sunday, November 28th, 2021 AT 12:49 AM
Tiny
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Okay. I think we need to step back and make sure we are following the testing on the info that the vehicle is giving us.

Disconnecting the ECM and checking for codes is going to give all sorts or different codes so we can't trust any of these codes at this point.

The only good info that provides is if you can not able to communicate with any modules using your scan tool and then you disconnect the ECM, and it restores communication to all other modules. If that is what is happening, then your ECMs are faulty.

However, if you hooked the first ECM back up and have the same codes plus the failed ECM codes then that ECM is faulty.

Then if the second ECM has these codes (P0606, P062F, etc.) Then that ECM is faulty as well.

Take a look at the info below on these codes. There is no testing required, basically if you have these codes, you replace the module.

At this point, I don't know if we have a module issue and a scan tool issue that can't communicate with this vehicle, but one thing is clear that if you have these codes then your ECM is no good.
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Sunday, November 28th, 2021 AT 9:12 AM
Tiny
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Look at what I am thinking, there's never a way 2 ECM can report the same thing, if this is ECM issue, immediately I put the new one those code will disappear, but I will see a mobilizer code. Again, if this is ECM issue, the moment I disconnect the ECM there will be no communication but upon I disconnect the ECM it still communicates showing that the module that establish that communication is still on the vehicle which I suspect to be the BCM but not the ECM that has been disconnected. I still suspect the BCM. What I will do now is to re-initialize all those modules if it didn't solve it, I will reprogram all the module and if it didn't work, I will replace the BCM.
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Sunday, November 28th, 2021 AT 11:42 AM
Tiny
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I generally agree that if two modules are reporting the same codes that it is most likely not the module. However, this is not impossible as I have seen it.

Normally when this happens you have something else on the vehicle that is causing the modules to fail but based on the information you are providing, I am not seeing what that would be.

When you are unplugging and plugging in other modules, are you removing the scan tool and cycling the key each time? Are you starting the communication process all over? If you are leaving the scan tool plugged in and just disconnecting the module then that is expected that the scan tool would keep communicating with it. Basically, that is the memory in the scan tool that is making it look like it is still connected to the ECM.

I suspect you are inducing some of these issues by swapping modules around and not resetting the ignition and disconnecting and reconnecting the scan tool, but I am not there to see this entire process. Which means I need to rely on what you are showing me, and those codes are very clear that they are saying the ECM has an internal defect and needs to be replaced.

At this point, I will go with what you are seeing since you are there and have a better idea what is happening.
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Sunday, November 28th, 2021 AT 12:27 PM
Tiny
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Yes, I do. Yes, I am starting the communication process again.

Note: It is very dangerous to leave your scanner plugged-in while unplugging and plugging the battery head because it can easily flash or bricked the scanner.
Again, from the design of this vehicle, that code you are referring to ECM might not be the ECM actually, it might be the BCM that's why the communication failure codes are stored there.
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Sunday, November 28th, 2021 AT 12:43 PM
Tiny
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Maybe I missed that information because I didn't see it noted on any of the info that these codes were stored in the BCM.

In short, you are exactly correct.

ECM doesn't always mean Engine Control Module unless this issue is related to the Engine/Powertrain Control module. Otherwise, this code is talking about any ECU that this code is set in.

So, if you have this code set in the BCM then you need to replace the BCM as you are suspecting.
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Sunday, November 28th, 2021 AT 1:07 PM
Tiny
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Otherwise, this code is talking about any ECU that this code is set in. Yes, look at the pictures below.
Those codes P0602, P0606, P018C, and P062F are permanently stored in the BCM memory. Even if you disconnect PCM and scan, you will still have them back, if you still plug the PCM, you will still have them. So, the best thing is to find another BCM and plug it in, if those codes disappear, then the BCM was flash or bricked.
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Sunday, November 28th, 2021 AT 1:32 PM
Tiny
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Yep. I missed that. I apologize. If those are in the BCM then it has failed. So, if I mislead you based on the fact that I thought these were setting in the ECM.
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Sunday, November 28th, 2021 AT 1:39 PM
Tiny
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Thank you so far for your support and assistance.

I have come to tell you that I have solved the problem of the vehicle and it started yesterday morning.
Procedures are as follow:

1. The vehicle does not read vin number.
2. My Bluedriver scanner which I entrusted so much was unable to communicate with it but my obdlink and obdii does.
3. I disconnect the new steering and plug the old one and the same problem of not starting still remain.
4. I trace all the communication lines, and all are correct and still display ECM, power steering and TCM not equipped
5. Finally, I leave the battery head plugged-in and disconnected BCM sockets. I try to connect scanner when I turn ignition on, unfortunately there was no power to the dashboard and scanner could not connect.
6. I open the BCM box to visually inspect for any damage on the board but I could not see any, I couple it back and when I was about to connect the BCM sockets, which was when I removed the battery head and immediately after connecting those sockets, I put it in battery head and the central lock shoot. I still used test lamp to probe BCM terminal that carries ignition power to ignition switch and I turn the ignition on and then off, the ignition remains on, I did it for three times before I removed the test lamp I used to probe the BCM terminals. Ignition went off and I turn it on and connect scanner it connected and read vin number, I cranked and it started. I recheck communication using Bluedriver as it was not connecting before, and it connected and read few codes on ABS and engine. So that's how I technically reset the BCM and solve the vehicle problem.
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Friday, December 3rd, 2021 AT 10:37 PM

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