Parts for your 2020 Holden Colorado-Spark plugs

2020 Holden Colorado spark plugs — are they used?

The 2020 Holden Colorado sold in Australia and New Zealand doesn’t use spark plugs at all. Technical sources confirm it runs the 2.8‑litre Duramax LWN four‑cylinder turbo‑diesel only. The 2020 Holden Colorado Owner’s Manual (Holden Ltd., MY20, Specifications) lists the sole engine as a diesel, and GM Global Propulsion Systems documentation for the 2.8L Duramax LWN describes it as a compression‑ignition diesel using glow plugs for cold starts, not spark plugs. Diesel engine fundamentals published by Bosch Automotive also explain that diesel engines ignite fuel from heat created by compression rather than an electrical spark.

So, while “spark plugs” show up in plenty of parts searches, they’re not relevant to a 2020 Holden Colorado in AU/NZ. Some overseas Colorados (badged Chevrolet) were sold with petrol engines, which do use spark plugs, and that’s often why generic catalogues list spark plug options against “Colorado” in a broad sense. For the locally delivered 2020 Holden Colorado ute, there’s no spark‑ignition hardware fitted.

Why no spark plugs? The 2.8L Duramax relies on:

• Compression ignition: extremely high compression heats the air so injected diesel ignites without a spark.
• Glow plugs: electric heaters in each cylinder that help cold starts, then switch off once the engine is warm.
• High‑pressure common‑rail injection: precise fuel delivery controls power, efficiency, and emissions.

If the owner is planning servicing and wondering about spark plug replacement, it’s one less thing to worry about. Instead, they’ll want to keep on top of diesel‑specific items such as glow plug health, fuel filter changes, clean air filtration, and proper DPF regeneration behaviour—these have a far bigger impact on starting, performance, economy, and emissions than any “spark plug service” would, because there aren’t any.

Technical sources referenced: 2020 Holden Colorado Owner’s Manual (MY20), GM Global Propulsion Systems – 2.8L Duramax LWN engine technical overview, Bosch Automotive – Diesel Engine Basics (compression ignition and glow plug function).

FAQs

Does the 2020 Holden Colorado have spark plugs?
No. The 2020 Holden Colorado in Australia and New Zealand is a 2.8L turbo‑diesel, which uses compression ignition. It doesn’t have or need spark plugs.

What does it use instead of spark plugs?
It uses glow plugs to aid cold starting and a high‑pressure common‑rail fuel system for precise diesel injection. Once warm, combustion is sustained by compression heat alone.

Why do some parts sites list spark plugs for a Colorado?
Many catalogues lump all “Colorado” models together. Some overseas Chevrolet Colorados had petrol engines that do use spark plugs. That listing doesn’t apply to the AU/NZ‑market 2020 Holden Colorado diesel.