Why Your Autel IM508S/IM608 II Won't Charge via OBD2 (Solved)

Issue Overview: A common question we receive is about the charging behavior of Autel Automotive Key Tools like the IM508S and IM608 II. Users note that the device charges correctly via its USB port but does not charge when plugged into a vehicle's OBD2 socket or a power source like the G-BOX3.

 

This is normal and intended behavior. Autel diagnostic tablets are designed to be charged via USB, not through the OBD2 port.

Why OBD2 Charging Is Not Supported?

The On-Board Diagnostics (OBD2) port in your vehicle is primarily designed for data communication, not for powering external devices for charging. Here are the technical reasons why charging via OBD2 is ineffective:

 

1. Insufficient OBD2 Interface Current

(1) The OBD2 port on most vehicles provides a very low current output, typically between 100mA to 200mA.

(2) This is insufficient to meet the higher power demands required for charging the IM508S or IM608 II batteries.

(3) In contrast, a standard USB charger (5V/1A-2A) provides ample, stable current for efficient charging.

 

2. Vehicle Power Management & Protection Mechanisms

(1) Ignition-Controlled Power

Many modern vehicles are designed to cut power to the OBD2 port entirely when the ignition is turned off to prevent battery drain.

 

(2) Voltage Protection

If the vehicle's battery voltage is low or unstable, the car's computer may further restrict power to auxiliary ports like OBD2, preventing any chance of charging.

Recommended Solution: Charge via USB

For optimal performance and battery health, always charge your Autel IM508S, IM608 PRO2, and other Autel Diagnostic Tools using the provided USB cable and a compatible wall adapter.

 

Benefits:

• Faster Charging: USB provides higher, stable current for a full charge.
• Reliability: Ensures your device is ready for use when you need it.
• Safety: Protects both your vehicle's electrical system and your valuable diagnostic tool.

 

Need More Support? If you have further questions about your Autel equipment, our technical team is here to help.

 

Email: sales@AutelShop.de

Wechat: +86-13429866263

Whatsapp: +86-13429866263

 

www.autelshop.de