2022 Volvo VNL Bulb Size Chart & Upgrade Guide

As an ASE-certified master technician, I’ve spent countless hours working on the electrical systems of heavy-duty trucks. The 2022 Volvo VNL series is a massive leap forward in commercial vehicle technology, particularly when it comes to forward illumination. Depending on the trim level (such as the VNL 300, 740, 760, or 860), your truck might be equipped with standard halogen reflector headlights or Volvo’s advanced factory LED headlamp assemblies.

Knowing the correct bulb sizes for your specific setup is critical for keeping your rig DOT-compliant and safe during long-haul night drives. Below is a comprehensive guide to the lighting setup on the 2022 Volvo VNL.

Quick Reference

Note: Many 2022 Volvo VNL models come equipped with fully sealed, factory LED headlight assemblies and marker lights. If your truck has standard factory LEDs, the bulbs are not individually replaceable; the entire housing or LED module must be replaced. The sizes below apply to base halogen/incandescent setups.

LED vs Halogen Upgrade Considerations

For fleet managers and owner-operators looking to upgrade their base halogen VNL to aftermarket LEDs, there are a few heavy-duty considerations. Volvo trucks utilize a sophisticated Light Control Module (LCM) and CANBUS system to monitor lighting loads.

• CANBUS Errors: If you swap an H11 halogen low beam for an aftermarket LED, the lower power draw will often trigger a "Bulb Out" warning on the driver information display. You will likely need an inline CANBUS decoder or anti-flicker harness to trick the system into recognizing the proper resistance.
• Beam Pattern: Commercial truck headlight housings are designed for specific focal points. When upgrading a halogen reflector housing to LED, ensure the LED chips closely mimic the original halogen filament to avoid blinding oncoming traffic—a major DOT violation.
• Factory LED Trims: If your 2022 VNL has the premium LED headlight package (notable by the integrated "V" shape DRL), you cannot simply swap a bulb if it fails. The entire housing must be replaced or serviced.

How to Replace Each Bulb

• Low / High Beam Headlights: Replacing the forward lighting on a VNL requires tilting the hood forward. Access to the back of the headlight assembly is relatively open compared to passenger cars. Twist off the dust cap, unclip the wiring harness, and turn the H11 bulb counterclockwise to remove it.
• Fog Lights: These are accessed from underneath the front bumper. You may need to remove a small splash shield depending on the bumper style. It’s a simple twist-and-pull removal for the H11 bulb.
• Front Turn Signals: If you have the halogen setup, the 3157NA bulb can be accessed through the back of the headlight housing alongside the main beams.
• Rear Lighting (Tail/Brake/Turn/Reverse): The rear light bars on the tractor chassis almost universally use standardized 4-inch round or oval sealed LED units. To replace them, pry the rubber grommet away from the housing, unplug the 3-prong pigtail, and push the new unit into the grommet.
• Side Markers & Cab Clearance Lights: The sun visor clearance lights and side markers on the sleeper/cab are usually sealed LED units on the 2022 models. If equipped with replaceable 194 bulbs, remove the two Phillips screws holding the lens.
• Interior Dome/Map: Gently pry the plastic lenses off with a non-marring trim tool. Pull the 194 or Festoon bulbs straight out of their sockets.

Common Lighting Issues for this Generation

The 2022 Volvo VNL is highly reliable, but it isn't immune to electrical hiccups. A common issue is moisture intrusion in the forward headlight assemblies, which can cause early failure of the factory LED modules or blow standard halogen bulbs due to thermal shock.

Additionally, because of the heavy vibrations typical of commercial trucking, wiring harnesses near the rear chassis light bars can chafe against the frame rails. If you are experiencing repeated blown fuses or flickering tail lights, inspect the routing of the rear harness before assuming the LED module is faulty. Finally, LCM software glitches can sometimes cause false "Bulb Out" warnings; a simple recalibration or update by a dealer can often resolve this.

If you are dealing with complex CANBUS errors, chasing down an electrical short, or need a headlight assembly replaced and aligned to DOT standards, don't leave it to chance. Find a trusted shop on Repairius.