Parts for your 2020 Holden Colorado-Ignition leads

2020 Holden Colorado ignition leads — are they even a thing?

Short answer: ignition leads aren’t used on the 2020 Holden Colorado. The RG Colorado in 2020 runs a 2.8‑litre Duramax turbo‑diesel (VM Motori), which is a compression‑ignition engine. Diesel engines don’t use spark plugs or distributor systems, so there are no spark plug wires/ignition leads to replace. This isn’t just workshop folklore — it’s backed by the Holden RG Colorado Owner’s Manual (MY20 diesel), GM Global Service Information for the 2.8L Duramax (RPO LWN/XLD28), and standard diesel theory as published in the Bosch Automotive Handbook. You also won’t find an ignition lead set listed for a 2020 Colorado in ACDelco AU/NZ parts catalogues.

Instead of an ignition system, the Colorado’s diesel relies on high compression and precise fuel injection to ignite the mixture. For cold starts, it uses glow plugs controlled by a glow plug module, with a dedicated wiring harness — not “ignition leads”. That’s why any talk of replacing leads on this model usually comes from confusion with older petrol utes or overseas variants.

If someone’s chasing an “ignition misfire” on a 2020 Colorado, the smarter checks are:

• Glow plug condition and the glow plug control module
• Injector performance and leak-back tests
• Fuel quality and the fuel filter service interval
• Battery health and starter performance (spins fast enough for compression ignition)
• Intake/EGR deposits and boost leaks

Practical servicing tips Aussies and Kiwis follow for these diesels:

• Replace the fuel filter on schedule (typically every 15,000 km/12 months as per local service schedules) and drain water separators if fitted.
• Test glow plugs if cold starts are lazy, there’s white smoke on start-up, or there are DTCs like P0671–P0674.
• Keep the battery in top nick, low cranking speed is a common culprit in “hard start” complaints.
• Use quality diesel and stick to reputable additives only when specified by a tech or OEM guidance.

Bottom line: the 2020 Holden Colorado doesn’t use ignition leads. When a parts search or a forum post suggests otherwise, it’s usually mixing up petrol hardware with a modern common-rail diesel. Focus maintenance where it counts — fuel, air, compression, and the glow system.

FAQs

Does the 2020 Holden Colorado have ignition leads?
No. The 2020 Colorado is a 2.8L turbo‑diesel, which uses compression ignition and glow plugs, not spark plugs. Technical sources like the Holden RG Owner’s Manual (MY20) and GM service information for the Duramax 2.8 confirm there’s no distributor, coil‑to‑plug leads, or spark plug wiring on this model.

What should be serviced instead of ignition leads on a 2020 Colorado?
Focus on diesel‑specific items: glow plugs and their control module, the glow/injector harness, fuel filter, battery, and injector condition. If cold starts are rough or there are codes such as P0671–P0674, have the glow system tested. Keep fuel filters on time (often 15,000 km/12 months locally) and ensure the battery and starter can deliver strong cranking speed.

I found “ignition leads” listed online for a Colorado — will they fit my 2020?
They won’t fit the 2020 diesel. Those listings typically relate to older petrol Colorados or other markets. For an RG 2020 VIN, there’s no genuine ignition lead set because the engine doesn’t use them. If in doubt, verify by engine type (2.8L diesel) and VIN with a parts counter.