2015 Volvo VNL Bulb Size Guide

Quick Reference Bulb Size Chart

LED vs Halogen Upgrade Considerations

Upgrading your 2015 Volvo VNL to LED lighting can offer significant benefits in terms of brightness, longevity, and energy efficiency. However, there are a few important factors to consider before making the switch. Volvo VNL trucks of this era are known for their sensitive Controller Area Network (CANBUS) systems. This system monitors the electrical current of various components, including the lights. Since LEDs draw significantly less power than halogen bulbs, the CANBUS system may interpret the lower power draw as a burnt-out bulb, resulting in a "bulb out" warning on your dashboard.

To avoid these errors, you will likely need to install CANBUS-compatible LED bulbs or use load resistors. CANBUS-compatible bulbs have built-in resistors that mimic the power draw of a halogen bulb, tricking the system into thinking everything is normal. If you opt for standard LED bulbs, you can wire a load resistor in parallel with each bulb to achieve the same effect. Be aware that load resistors can get very hot, so they must be mounted to a metal surface away from any plastic or wiring.

For headlights, ensure that any LED replacement is designed for projector housings, if your VNL is so equipped. Placing an LED bulb in a reflector housing designed for a halogen bulb can result in a scattered, unfocused beam pattern that can blind oncoming drivers. Also, check for any necessary adapters or heat sinks that may be required for a proper fit.

How to Replace Each Bulb

Low and High Beam Headlights: Access to the headlights on the 2015 Volvo VNL is straightforward. Open the hood and locate the back of the headlight assembly. The low and high beam bulbs are secured by a retaining ring that can be twisted to remove. Disconnect the wiring harness, replace the bulb, and reassemble.

Fog Lights: The fog lights are located in the lower bumper. Access may require removing a splash shield or access panel from underneath. The bulb is typically held in by a similar retaining ring as the headlights.

Front Turn Signal: The front turn signal is located within the headlight assembly. Access it from the back of the assembly, similar to the headlight bulbs.

Rear Turn Signal, Brake, and Tail Lights: These bulbs are all housed in the rear tail light assembly. To access them, open the rear door and remove the screws holding the assembly in place. The bulbs can then be accessed from the back of the housing.

Reverse Light: The reverse light is also located in the tail light assembly and can be accessed in the same manner as the other rear bulbs.

License Plate Light: The license plate light housing is typically held in by a couple of screws. Remove the housing to access and replace the bulb.

Side Marker Light: The side marker lights can usually be accessed by removing a few screws from the lens or by prying the housing out from the side of the truck.

Dome/Map Light: The dome and map light covers can be carefully pried off with a small, flat-head screwdriver. Once the cover is off, the bulb can be easily replaced.

Common Lighting Issues for This Generation

The 2015 Volvo VNL is a reliable truck, but like any vehicle, it can experience some common lighting issues. One of the most frequent complaints is premature bulb failure, which can often be attributed to vibration. To combat this, consider using long-life or heavy-duty rated bulbs. Another common issue is moisture in the headlight housings, which can lead to corrosion and bulb failure. If you notice condensation in your headlights, it is a good idea to remove the housing, dry it out, and reseal it with a quality sealant.

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