Jaltest Error DM004

Written By Kevin Vieth

What is Jaltest Error DM004?

You may be attempting to reinstall or update your Jaltest Diagnostic Software through the Jaltest Download Manager and encounter the following error:

DM004 - Problem connecting to server. Please, check your internet connection and try again. If the problem persists, please contact the Technical Assistance.

This error is a communication issue disrupting communication with the control unit.

Originally, you were not able to download the installation package through the Download Manager.

This is an old error that was originally resolved by the release of version 23.3 on November 13th, 2024. However, you may still be seeing a 004 communication error in 2025.

How to solve Jaltest Error 004

How to Troubleshoot Jaltest 004 Errors in 2025

Follow the steps below to fix the Jaltest 004 communication error:

  1. First, take the time to consider your area’s power supply. The connection can fail in insufficient power conditions. Your power supply needs to support the control unit and the device.

  2. Assess the connection between Jaltest link and the control unit. Ensure that you are using the correct connection cable.

  3. Check for damage on the communication line and wires on the diagnosis socket. Any damage can compromise the connection. If you notice signs of damage, please contact Jaltest technical support or your distributor as soon as possible.

  4. Check to make sure the system you selected matches the system installed on the vehicle.

  5. If none of the above steps have solved the issue, trying connecting while the engine is running. Some control units only get power when the engine is on. In the future, see if you can put the engine in service mode to prevent this issue.

We can help get your Jaltest software installed, updated, and connected:

  • Click on the question mark button when you receive the error message to get more information about the error.

  • Contact Jaltest technical support or your distributor for assistance on downloading the installation package through an external link, or fixing the connection.

If you need assistance or would like more information on Jaltest please contact your Jaltest Experts: WholeFleet Diagnostics!

Kevin Vieth

Kevin Vieth founded VieTech Training & Consulting Inc. in 2016 out of a passion for empowering heavy-duty and automotive service technicians through technical training. Due to the fast pace of technological advancements, he believes that on-going knowledge and skill development is imperative. With the operational pressures applied to business managers, skills training can be inconvenient, inaccessible and costly. This motivated Kevin to develop the Diesel Engine Technology Fundamentals in-class training curriculum to provide relevant and realistic diesel technology diagnostic training that is on-site, on-time and on-budget.

As a former technical Training Instructor for Cummins Western Canada, Kevin has delivered over 125 Cummins engine certification courses to over 500 heavy-duty technicians. Prior to his time with Cummins, he worked as a journeyman 310S automotive technician and then spent 3 years as a technical lead for Westport Innovations, a world leader in natural gas fuel system development. Kevin’s experience as a service technician, combined with his knowledge of fuel, emissions and engine controls acquired at Westport, helped him excel as a Cummins trainer and in diesel engine fault troubleshooting.

In addition to delivering on-site diesel engine diagnostic training to fleets nation-wide, Kevin also provides on-going remote troubleshooting and technical support to his clients.

https://www.vietech.ca
Previous

Jaltest 23.3 Update
Next

Connecting Jaltest to Light-Duty and Passenger Vehicles