Engine-Codes - Generic - U0100

U0100 Code - Lost Communication with Engine Control Module/Powertrain Control Module

- Code Popularity: 152,791 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U0100?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Check for more codes
  • Faulty Engine Control Module (ECM) / Powertrain Control Module (PCM)
  • ECM/PCM harness is open or shorted
  • ECM/PCM circuit poor electrical connection

Code Tech Notes

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

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How to Fix the DTC U0100?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the U0100 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the U0100 Code Mean?

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a message that includes the transmitter device availability has not been received.

U0100 Code - Lost Communication with Engine Control Module/Powertrain Control Module

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Code U0100 Information for Specific Makes

  • U0100 Audi Lost Communication With ECM
  • U0100 BMW Lost Communication With Engine Control Module
  • U0100 Buick Lost Communication With Engine Control Module
  • U0100 Cadillac Lost Communication With Engine Control Module
  • U0100 Chevrolet Lost Communication With Engine Control Module
  • U0100 Chrysler Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 Dodge Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 Ford Lost Communication With Powertrain Control Module
  • U0100 GMC Lost Communication With Engine Control Module
  • U0100 Hummer Lost Communication With Engine Control Module
  • U0100 Hyundai Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 Infiniti Lost Communication With Engine Control Module
  • U0100 Jeep Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 KIA Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 Lexus Lost Communication with Engine Control Module  📷
  • U0100 Lincoln Lost Communication With Powertrain Control Module
  • U0100 Mazda Lost Communication With Engine Control Module
  • U0100 Mercury Lost Communication With Powertrain Control Module
  • U0100 Nissan Lost Communication With Engine Control Module
  • U0100 Pontiac Lost Communication With Engine Control Module
  • U0100 Saturn Lost Communication With Engine Control Module
  • U0100 Scion Lost Communication with Engine Control Module  📷
  • U0100 Suzuki Lost Communication With Engine Control Module/Powertrain Control Module
  • U0100 Toyota Lost Communication with Engine Control Module  📷
  • U0100 Volkswagen Lost Communication With ECM

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