| U0401:81 | Invalid Data Received from the ECM /PCM A: Invalid Serial Data Received | This DTC is set when the IPC receives invalid network data for 5 seconds or more from the PCM for the engine oil temperature and the inlet air temperature data. |
Yes I think I did I have been chasing the fix for that code since last year . Had the U0401:81 code it was a ground for me I used a dremel to sand the paint to give a better connection and it’s gone now . I’m sitting in the car it’s raining now so don’t feel like getting out sorry , not looking at the paper that has the numbers but think it’s ground 100? . I will look when I get home but those 3 grounds in passenger side at the top are what fixed it for me I’ll be home soon
Ok I had taken my car to 2 different ford service few months ago told them I think it’s a ground issue they ignored me . one said the code wasn’t there another said it was a ghost code and screwed up a basic oil change after that I wonder how they tie thier own shoes , anyway I took the car to HPP to get the JLT and tune and thought I would ask while I was there they did a check in the icp by hooking it directly to battery which had been flaky it’s a long story that doesn’t matter here. but after he showed me there was an electrical issue I figured since it worked when directly hooked to battery the issue is probably somewhere between the 2 places. I have been busy so the first I was able to check was G102,G103 and G100. I used a dremel to sand the spot to make sure there was a good connection . After I did that the U401:81 code is gone . I will continue with the other grounds to try and fix the other code I have but haven’t had enough time yet . I have had to chase ground issues in past too what I did was get the information about all grounds in the car to see where the grounds are and where they connect . If you don’t have a service manual I was able to get the information from motorcraftservice.com I just paid for the $23 one you don’t have to spend a lot to get what you need .
