Learn How to Erase DTCs with KESS3 – Alientech KESS3 DTC

DTC Removal Training with KESS3 – Learn How to Clear ECU Fault Codes by KESS3

In this specialized training course, you'll discover how to detect and remove Diagnostic Trouble Codes (DTCs) using the industry-leading KESS3 device by Alientech. Whether you're an experienced tuner or a technician just starting out, this course provides the essential knowledge to eliminate fault codes and optimize ECU performance—especially after software modifications or hardware changes.
 

What Are DTCs and Why Do They Matter?

Diagnostic Trouble Codes (DTCs) are error messages generated by the ECU when it detects irregularities in the vehicle’s systems. These may include issues related to the engine, exhaust system, transmission, sensors, and more.
After performing ECU remapping or hardware adjustments—such as EGR or DPF removal—many of these codes become obsolete or misleading. If not properly removed, they may:

- Cause the Check Engine Light (CEL) to stay on
- Trigger limp mode, reducing engine power
- Interfere with the performance of the tuned vehicle

That’s why professional DTC removal is a must after tuning.

Why Is DTC Removal Important After Tuning?

When tuning a vehicle’s ECU, you're essentially rewriting how it behaves. If certain components have been removed or disabled, but the ECU still monitors them, related error codes may appear. By safely deleting unnecessary DTCs:
- You avoid unwanted warning lights or errors
- The vehicle operates smoothly without entering limp mode
- You deliver a clean, professional tuning file free of false alarms
 

KESS3 DTC Feature – Your All-in-One Fault Code Management Tool

The KESS3 DTC function empowers you to scan, analyze, and remove DTCs directly from the ECU. It simplifies fault management and is ideal for tuners aiming for clean and stable ECU files.
 

How to Use the DTC Feature in KESS3

Using this functionality is quick and user-friendly:
1. Connect to the Vehicle: Attach KESS3 to the car via OBD and ensure an internet connection is active for protocol access.
2. Select the Vehicle Model: Choose your specific vehicle in the Alientech Suite software and select the DTC option.
3. Perform a Scan: Run a diagnostic scan; the device will list any DTCs currently stored in the ECU.
4. Clear the Codes: Use the “Clear DTC” button to safely erase those error codes from the system.
 

KESS3 DTC Software Availability and Subscription Requirements

To access the DTC feature, your KESS3 device must have an active subscription along with at least one protocol activation, such as:
- Car/LCV OBD
- Car/LCV Bench/Boot
- Bike OBD
- Bike Bench/Boot

If these conditions are met, the DTC functionality is automatically enabled in your Alientech Suite software. However, keep in mind that this feature will stop working once the subscription expires and will only be reactivated after the subscription is renewed.
 

What You’ll Learn in This Course

- Understanding the role of DTCs in automotive diagnostics
- How to safely read and erase DTCs using KESS3
- Best practices for DTC management after ECU remapping
- Real-world use cases with updated Alientech software (e.g., Upgrade 2.05)
- Delivering error-free, optimized tuning files with confidence
 

Who Should Join This Course?

- Automotive tuners of all experience levels
- ECU programmers and chip tuning specialists
- Auto repair professionals using Alientech tools
- Anyone aiming to master clean and compliant ECU modifications

Removing DTCs with KESS3 is a critical skill in modern automotive tuning. This course empowers you with the tools, knowledge, and confidence to deliver top-tier ECU files—clean, stable, and error-free.