144-SMD LED Signal Bulb PY21W/P21W — 144-SMD glass-type LED signal bulb covering PY21W, P21W, P21/5W & T20 fitments, sold as a pair. It is CANBUS-ready and ships pan-India.
| 🏷️ Brand | TecUpdater |
| 💡 LED Chip Type | 4014 SMD |
| 🔢 SMD Count | 144 LEDs |
| 🔌 Available Bases | PY21W (BAU15S), P21W, P21/5W, T20 (7440) |
| ⚡ CANBUS Compatibility | High (Resistor may be required in rare cases) |
| 🚗 Applications | Indicator, Brake, Reverse, Rear Fog, Parking |
| 🔄 Return Policy | Exchange Only |
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
144-SMD LED Signal Bulb PY21W/P21W — Overview
The 144-SMD LED signal bulb PY21W/P21W uses 4014 chips arranged across a glass-type body to replace slow-responding, heat-generating halogen bulbs in indicator, brake, reverse, rear fog, and parking positions. Sold as a CANBUS-ready pair, this 144-SMD LED signal bulb PY21W/P21W also covers P21/5W and T20 bases for direct fitment.
Looking for a different signal bulb type? Check below.
P21W BA15S LED Bulbs – Ultra-Bright, Error-Free Reverse, DRL & Brake | 1 Pair
₹820.00 Select options This product has multiple variants. The options may be chosen on the product pageT20 7440 W21W LED Turn Signal Indicator LEDs – High Brightness CANBUS | 1 Pair
₹820.00 Select options This product has multiple variants. The options may be chosen on the product page
Benefits
Faster illumination response
Uniform reflector fill
High CANBUS compatibility
Multiple base options
Direct halogen replacement
Cleaner and brighter output
FAQs
This 144 SMD LED bulb pair comes with a 6 month warranty.
This bulb is built with high CANBUS compatibility, which reduces flicker and dashboard error warnings in most vehicles by better matching the current draw expected by the factory system. In rare cases where a vehicle’s bulb monitoring is more sensitive to the resistance difference between halogen and LED, an external load resistor may still be needed.
No coding is required in most vehicles. This is a direct plug-in replacement for the matching base type.
Check your vehicle’s original bulb type before ordering. This bulb is available in PY21W (BAU15S) for typical turn indicator sockets, P21W for single-contact applications, P21/5W for dual-contact tail and brake sockets, and T20 (7440) for that fitment, so match it to whichever bulb your car currently uses.
Yes, the P21/5W dual-contact version supports combined tail and brake functions, and the faster illumination response of the LED chips is particularly useful for brake signaling.
Yes, as long as the base type matches your vehicle’s original bulb, since this bulb is used for indicator, brake, reverse, rear fog, and parking light applications depending on the base selected.
LEDs can be polarity-sensitive in some sockets, so if the bulb does not light up, try rotating it in the socket and reinstalling it.
This bulb’s bases are used across many vehicles from Volkswagen, Skoda, Hyundai, Kia, Tata, Mahindra, and Maruti Suzuki, among others, depending on which bulb type your specific model uses. Always confirm against your car’s original bulb specification.
The bulb uses 4014 LED chips arranged as 144 individual SMD elements spread around the bulb body, which fills the reflector housing more evenly and reduces the hotspotting that lower-SMD-count LED bulbs often show.
This product is covered under an exchange-only return policy.
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