Parts for your 2020 Holden Colorado-Ignition coils

2020 Holden Colorado ignition-coils

For the 2020 Holden Colorado sold in Australia and New Zealand, ignition-coils aren’t fitted and aren’t required. Technical sources including the Holden Colorado RG Owner’s Manual (MY20) and GM service information for the 2.8‑litre Duramax (engine code LWN) confirm this model is diesel only. Diesel engines ignite fuel by compression rather than a spark, so they don’t use spark plugs or ignition-coils. This is consistent with diesel fundamentals outlined in the Bosch Automotive Handbook (diesel = compression ignition, no high‑voltage ignition system).

Instead of coils, the Colorado’s LWN turbo‑diesel uses a high‑pressure common‑rail injection system and a glow plug control module with glow plugs to aid cold starts. Once the engine’s warm, combustion is maintained by compressing air to very high pressure and temperature, then injecting precisely metered diesel. Because there’s no spark to manage, there’s no distributor, no ignition leads, and no coil‑on‑plug hardware to service.

That’s why anyone searching for 2020 Holden Colorado ignition-coils will come up empty — and why coil listings you might see online usually relate either to petrol Colorados sold in other markets (e.g., Chevrolet Colorado 2.5 or 3.6 petrol with coil‑on‑plug) or to older Holden petrol models. For AU/NZ 2020 diesels, coils simply aren’t part of the picture.

What should owners focus on instead? Good diesel health comes from crisp fuel delivery, strong cranking, and clean air. During servicing, attention typically goes to:

• Glow plugs and the glow plug control module (for reliable cold starts)
• Battery and starter performance (diesels need strong cranking speed)
• Fuel filter condition and water contamination checks
• Injector performance and rail pressure control
• EGR, intake cleanliness, and DPF health for smooth running

If the Colorado feels like it’s “misfiring,” it’s more likely a fuel delivery or air management issue than anything to do with ignition-coils. A scan for fault codes, glow plug testing, fuel filter inspection, and injector balance checks are the right diagnostic steps. Bottom line: the 2020 Holden Colorado doesn’t use ignition-coils because its diesel engine doesn’t need them — and that’s by design.

FAQs

Does the 2020 Holden Colorado have ignition-coils?
No. It’s powered by the 2.8‑litre Duramax turbo‑diesel (LWN), which uses compression ignition with glow plugs, not spark plugs or ignition-coils. This setup is confirmed by Holden/GM technical literature for the RG Colorado MY20.

What causes hard starting or rough running if there are no coils?
Common diesel culprits include tired glow plugs, a weak battery, a clogged fuel filter, injector issues, rail pressure faults, intake leaks, or EGR/DPF concerns. A proper diagnostic scan and basic fuel/air checks usually pinpoint the cause.

Do any Colorados use ignition coils?
Yes, petrol variants in other markets (e.g., some Chevrolet Colorados) use coil‑on‑plug ignition. However, the 2020 Holden Colorado in Australia and New Zealand is diesel only, so it doesn’t have ignition-coils.