---
title: How to Diagnose ECU/ECM “No Communication” (U0100) on Infiniti & Nissan
description: "Fix U0100 on Infiniti & Nissan: confirm power/ground, fuses, CAN health, connectors—then repair your original ECU with UpFix to restore communication fast."
---

[UpFix Electronics Repair News and Tech](https://blog.upfix.com)

# [How to Diagnose ECU/ECM “No Communication” (U0100) on Infiniti & Nissan](https://blog.upfix.com/how-to-diagnose-ecu/ecm-no-communication-u0100-on-infiniti-nissan)

 Written by [Christian Austin](https://blog.upfix.com/author/christian-austin) | Oct 29, 2025 7:47:00 PM

Issues like low battery voltage, damaged or shorted CAN lines, blown ignition power feeds, bent connector pins, or even a faulty ECU can all cause the ECM to disappear from the network.

[View full post](https://blog.upfix.com/how-to-diagnose-ecu/ecm-no-communication-u0100-on-infiniti-nissan)

```json
{
  "@context" : "http://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "Christian Austin"
  },
  "dateModified" : "2025-11-17T17:53:10.772Z",
  "datePublished" : "2025-10-29T19:47:00Z",
  "headline" : "How to Diagnose ECU/ECM “No Communication” (U0100) on Infiniti & Nissan",
  "image" : {
    "@type" : "ImageObject",
    "height" : 1024,
    "url" : "https://43816393.fs1.hubspotusercontent-na1.net/hubfs/43816393/ChatGPT%20Image%20Oct%2020%2c%202025%20at%2002_34_22%20PM.png",
    "width" : 1536
  },
  "mainEntityOfPage" : "https://blog.upfix.com/how-to-diagnose-ecu/ecm-no-communication-u0100-on-infiniti-nissan",
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "height" : 60,
      "url" : "/hs/hsstatic/content_shared_assets/static-1.4092/img/default-amp-logo.png",
      "width" : 60
    },
    "name" : "UpFix Blog"
  }
}
```