Parts for your 2020 Holden Colorado-Interior bulbs

2020 Holden Colorado interior bulbs

Based on the 2020 Holden Colorado RG Owner’s Manual (MY2020) interior lighting section, Holden/GM Service Information for the RG series, and common AU/NZ bulb catalogues (e.g., Narva and Philips bulb guides), the Colorado is fitted with interior bulbs. These include the dome/courtesy and map lamps, and depending on trim, glovebox, vanity mirror, and cargo/box illumination. Most variants use replaceable wedge (W5W/T10) and festoon (C5W ~31 mm) bulbs, while select locations on some trims may use integrated LEDs.

Interior bulbs do the simple but important jobs: lighting up the cab when hopping in at night, giving clear visibility for maps, devices, or child seats, and making sure the glovebox and rear seat areas aren’t a lucky dip. For a 2020 Colorado that works hard as a daily or a tourer, bright, reliable cabin lighting makes every early start and late finish a bit easier.

As part of regular servicing, a quick check of all interior lights is worth it. If a lamp’s dim or out, replacements are easy on most trims:

• Use a plastic trim tool to gently pop the lens, avoid metal screwdrivers that can mark the trim.
• For wedge (W5W/T10) and festoon (C5W ~31 mm) bulbs, pull out the old unit, seat the new one firmly and test before refitting the lens.
• If upgrading to LEDs, match polarity (flip the bulb if it doesn’t light), choose CANbus-friendly options to avoid flicker, and stick to warm or neutral white for comfortable cabin light.
• Avoid touching halogen/incandescent glass with bare fingers, oils can shorten bulb life.
• If a location uses a sealed LED assembly (seen on some vanity or cargo lights), replacement involves the lamp unit rather than just a bulb—check Holden/GM service info or a trusted auto sparky.

Typical fitments for the 2020 Colorado are W5W/T10 for map and small courtesy points and 31 mm festoon for the main dome. Always confirm against the VIN in the Holden Genuine Parts catalogue or a reputable AU/NZ bulb guide, as trim and build variations exist. If working near airbags or wiring, play it safe—switch off the lights, remove the key, and if needed, disconnect the negative battery terminal to avoid accidental shorts. Fresh bulbs keep the Colorado’s cabin practical, tidy, and ready for whatever the day throws at it.

What bulb sizes fit the 2020 Colorado’s interior lights?

Most use W5W/T10 wedge for map and small courtesy positions and a 31 mm festoon (C5W) for the dome. Variations by trim/build exist, so confirming via the Holden parts catalogue or an AU/NZ bulb guide is best practice.

Are the interior lights halogen or LED from factory?

The Colorado commonly ships with incandescent wedge and festoon bulbs. Some trims/locations may have integrated LEDs (e.g., certain vanity or cargo lamps). If it’s LED and sealed, the whole lamp assembly is replaced, not just a bulb.

Can upgrading to LED cause errors or flicker?

It can on some vehicles. Choose CANbus-compatible LED bulbs from reputable AU/NZ brands. Ensure correct polarity and test before refitting the lens. If flicker persists, a resistor-equipped LED or returning to quality halogen is the simple fix.