Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

DTC code 2019 honda civic EX U0100 Lost Communication With ECM/PCM A

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5 years 6 months ago - 5 years 6 months ago #37752 by assem.nagi
Hello friends I tried reading the codes for my 2019 honda civic EX and got two new codes.

U0100 Lost Communication With ECM/PCM A.

U0038 Vehicle Communication Bus B Performance.

The vehicle is a push to start and wont start at all the engine is a L15BA and the intake are not attached to the engine yet if that's a possible cause.

Any info on how I might be able to fix this issue like where to start and so on is greatly appreciated.

Thx again.
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Last edit: 5 years 6 months ago by assem.nagi. Reason: Saw the post about making things clear.

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5 years 6 months ago #37755 by Cheryl
You have the intake manifold off?? Take test light hooked to battery plus probe pins 4 and 5 at the data link connector. Should light. Sounds like the pcm is miss it’s grounds

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5 years 6 months ago - 5 years 6 months ago #37780 by assem.nagi
No, I'm sorry I meant to say I have the airbox off also the turbo I looked at all of the grounds and fuses and they all look good what should I do next again thank you to everyone helping out.
Last edit: 5 years 6 months ago by assem.nagi.

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3 years 8 months ago #53109 by Mike619
You can fix the problem? ,
I have the same two codes
You can help me please

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