TopFlyTech T8603

TopFlyTech T8603 is a very simple OBDII-type tracker. It does not read any OBD II information, but it uses power supply from OBD II port. No special skills required for the installation - just plug it to the car diagnostic port.

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Location and tracking

T8603 model is embedded with GPS and doesn’t have support of GLONASS or alternative systems. It neither supports Assisted GPS technology. As the back-up, when no satellites signals are available, it uses Cell ID location (also known as LBS-tracking).

OBDII data reading

T8603 is a simple tracker. It only gets power supply from OBDII port, but it does not read any data from vehicle CAN bus or K-Line. With T8603 you will be unable to get telemetry from onboard diagnostic system, сheck engine lamp (MIL) or DTC codes.

Mobile networks

With Quad-band GSM module T8603 can be operated in 2G networks all over the world.

Power supply

T8603 uses OBD II Connector Type B (9 of 16 pins used) and voltage range 6-36V, which makes possible to install T8603 both on cars and trucks.

T8603 also features a built-in rechargeable backup battery. When fully charged it ensures about 1-2 hours of device operation (in normal conditions).

When being unplugged from the OBDII socket the device sends notification to server.

Remote management

T8603 tracker can be fully controlled over GPRS, including configuration of tracking modes. There is also a wide list of SMS commands in a human-friendly format, on which device always replies back.

It supports remote configuration of APN settings, server address and port by SMS.

LED Indication

T8603 has two LEDs

  • Red LED indicates GSM/GPRS mode
  • Blue LED indicates GPS reception

The light goes out automatically in five minutes after the device is plugged into OBDII port.

Additional notes

In some cars it’s not possible to read the Ignition state from the OBDII port. Then T8603 uses proprietary algorithm based on multiple parameters to evaluate the Ignition is ON with 98% accuracy. And the same algorithm it uses to detect the car engine is OFF and reduces the power consumption.

Compared to other OBDII trackers, T8603 seems a little longer. It might cause the device don’t fit the interior details in some cars. To overcome this problem an OBDII extension cable (optional accessory) can be used.

To switch device off (even with charged battery) just remove the SIM card. The device will switch off in 5-10 seconds.

Server Integration

EU (
US (
Server port47744

General information

InstallationNot required
Special form factorOBDII Dongle


Peso60 g (2.12 oz.)
Tamanho63x47x26.5 mm (2.48x1.85x1.04 in)

GNSS Location

Antena interna (GNSS)Yes
Antena externa (GNSS)No


Tipo de rede celularGSM Quad Band
Antena interna (Conexão)Yes
Antena externa (Conexão)No
Geração de rede celular2G


ACC/Ignition inputYes
Discrete inputsYes

Hardware features

Capacidade da bateria280 mAh
Bateria integradaYes
Emergency buttonNo
Detach sensorYes
Non-volatile memoryNo

Hardware extras

Fuel level sensor readingNo
Driver ID readingNo
Fuel temperature sensor readingNo
Engine block special controlYes

Tracking features

Tracking modesContinuous
Smart power consumptionNo
ECO drivingNo

Events monitoring

Battery lowYes
External power cut offYes
Device switched on/offYes

Self monitoring

GNSS signal levelYes
GNSS satellites fixedYes
On request
External power source voltageNo

CAN/OBDII reading

Tipo de leitor CAN/OBDIINo
Check engine lightNo
DTC codes readingNo

Remote management

Server connection setup over SMSYes
Remote device configurationYes (over GPRS), Yes
Message exchange formatBINARY
Firmware update OTANo
Forced LBS location update over GPRSNo
Forced GNSS location update over SMSNo


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