What It Is

The TecUpdater 144 SMD CANBUS LED bulb is a glass-type automotive LED replacement bulb designed to directly replace factory halogen bulbs used in exterior lighting positions such as turn indicators, brake lights, reverse lights, rear fog lights and parking lamps.

It uses 4014 LED chips arranged in a 144-SMD layout to deliver uniform brightness across the reflector housing while maintaining correct base compatibility for direct fitment.

Available base types include:

• PY21W (BAU15S)

• P21W

• P21/5W (dual contact)

• T20 (7440)

What Problem It Solves

Factory halogen bulbs suffer from:

• Slower illumination response time

• Higher heat generation

• Shorter lifespan

• Dull yellow output

• Uneven reflector fill in some housings

In addition, many users upgrading to LED encounter flickering or bulb warning errors due to resistance mismatch in modern CANBUS-equipped vehicles.

This 144 SMD LED bulb addresses these issues by:

• Delivering faster illumination response (important for brake signals)

• Producing brighter, cleaner light output

• Generating lower heat compared to halogen

• Offering high CANBUS compatibility to reduce error messages

However, as resistance monitoring varies by manufacturer, some vehicles may still require an additional load resistor in rare cases where the system detects a resistance difference between halogen and LED.

Where It Is Used

Depending on the selected base type, this bulb can be used for:

• Front turn indicators

• Rear turn indicators

• Brake lights

• Tail + brake dual-function applications (P21/5W)

• Reverse lights

• Rear fog lamps

• Parking lamps (where applicable)

Application depends entirely on the vehicle’s original bulb specification.

LED Chip and Illumination Logic

The 4014 LED chip design provides:

• Balanced brightness

• Improved thermal management

• Stable voltage handling

With 144 individual SMD elements distributed around the body, the bulb fills reflector housings more evenly than low-SMD alternatives. This is especially important in rear brake and indicator housings where hotspotting can reduce visual clarity.

CANBUS Compatibility Explained

Modern vehicles use bulb failure detection systems that measure electrical resistance. Traditional halogen bulbs draw higher current compared to LEDs.

This bulb is built with high CANBUS compatibility, meaning:

• In most vehicles, it works without dashboard errors

• Flicker is minimized

• Error warnings are reduced

However, in vehicles with aggressive bulb monitoring systems, an external resistor may be required to simulate halogen load. This is uncommon but possible depending on the vehicle.

Installation Notes

• Direct replacement for matching base type

• No wiring modification required

• No coding required in most vehicles

• Ensure correct bulb type selection before purchase

• Test polarity before final installation (LEDs are polarity-sensitive in some sockets)

Key Compatibility

Compatible with vehicles using the following bulb bases:

• PY21W (BAU15S offset pin)

• P21W (single contact)

• P21/5W (dual contact)

• T20 / 7440

Used across many vehicles from:

Volkswagen, Skoda, Hyundai, Kia, Tata, Mahindra, Maruti Suzuki and others depending on bulb type specification.

Compatibility must be confirmed based on original bulb model fitted in the vehicle.

Who Should Buy This Product

• Owners upgrading halogen signal or brake bulbs to LED

• Users wanting brighter reverse visibility

• Drivers seeking cleaner light output

• Vehicles with CANBUS monitoring requiring higher compatibility LED

Who Should Not Buy This Product

• Vehicles using incompatible bulb bases

• Users expecting guaranteed error-free operation without verifying compatibility

• Vehicles requiring manufacturer-specific coding for LED retrofit

Benefits

• Faster illumination response

• Uniform reflector fill

• High CANBUS compatibility

• Multiple base options

• Direct halogen replacement

• Cleaner and brighter output

FAQs

Will this bulb cause hyperflashing?
In most vehicles with standard CANBUS monitoring, no. However, some vehicles may require additional load resistors.

Do I need coding after installation?
In most cases, no coding is required. Compatibility depends on vehicle ECU monitoring behaviour.

How do I choose the correct base?
Check the original bulb specification in your vehicle manual or remove the existing bulb and verify the model number.

Relevant Search Phrases We Cover