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OBD2/J1939 3g Dongle


New product

U-503G is a plug & play 2G+3G OBD gps tracker that can install in cars & trucks, it reads data from car ECU, including mileage, fuel consumption, fuel level, engine temperature, DTC code, VIN & others. It also record driving behavior data & send to server for analysis. It is widely used in fleet management & insurance telematics.

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Key features:

● OBDII and CANBUS protocol, DC 12V and 24V;

● 2G GSM/GPRS 850/900/1800/1900MHz;

● 3G UMTS/HSPA 2100/1900/850/900MHz; ● Plug and play, Small size, no installation cost;

● Collect fuel consumption, fuel level data;

● Very accurate mileage data (accuracy>99%);

● Collect DTC (Diagnostic Trouble Code) for remote diagnostic;

● Collect VIN, engine temperature;

● Internal GSM and GPS antennas;

● TCP and UDP protocol;

● Update firmware over the air;

● Illegal start-up, impact and rollover alarm notifications

● Detect harsh acceleration, braking, turn and high revolution;

● Driving behavior recording and analysis;

● Store break points data in non-volatile memory;

● Auto sleep mode to save automotive power;

● Wide working temperature range: -30 to +80℃

Vehicle Protocol


ISO 15765-4 (CAN)

ISO 14230-4 (Keyword Protocol 2000)

ISO 9141-2 (Asian, European, Chrysler vehicles)

SAE J1850 VPW (GM vehicles)

SAE J1850 PWM (Ford vehicles)

ISO 15765

ISO 11898 (raw CAN)

SAE J1939 OBD protocol

Non-legislated OBD protocols (can be added according to customer's needs):

Single Wire CAN (SW-CAN) – GM proprietary network

Medium Speed CAN (MS-CAN) – Ford proprietary network




General Specifications



Accelerator sensor and shock sensor

Case Material


Operation Voltage

DC 12 or 24V

Active current


Operation Temperature

-30 to +80C

Operating Humidity

5% to 95%, non-condensing