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Holden Colorado Engine Number
Use this guide to locate the engine number on your Holden Colorado and line up the right engine-related parts enquiry.
The Colorado is Holden's one-tonne ute, sold as the Isuzu-derived RC (2008-2012) and then the RG / RG II (2012-2020). It directly replaced the Rodeo name in 2008 and was offered in 4×2 and 4×4, with single, space and crew-cab bodies. There was also a Colorado 7 wagon (later renamed Trailblazer).
Where to find your Holden engine number
The stamped engine number is on a machined pad on the block. Its location depends on the engine family:
- Inline six-cylinder: on a pad on the right-hand side of the block, above the engine-mount boss.
- V8 (253 / 308, 4.2 / 5.0 litre): on a pad on the left-hand side of the block, above the engine mounting.
- V6 (Buick-derived, Ecotec, Alloytec): on the front left-hand face of the block, below the ignition coil.
- Later V6 and LS V8 models: the build / engine plate sits on the radiator support panel (VT-VZ era) or the passenger-side strut tower (VE / VF era).
You may need to wipe the pad clean to read the stamped number, and on air-conditioned cars the compressor can sit in front of it. Older Holden engines use a capacity-plus-tune prefix (for example 186S or a Q-series V8 code), while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
For the most accurate part match, send us both the engine code or prefix and the full stamped number, along with whether the car is automatic or manual.
On this model
The RC used Isuzu diesel power (notably the 3.0-litre 4JJ1) plus petrol options, while the RG's 2.8-litre turbo-diesel is a GM/VM Motori "Duramax" unit rather than an Isuzu engine — an easy point to get wrong. On the RG, the engine serial number is on the right-hand side at the rear of the engine block. Quote the series and engine, plus the stamped engine number, for the right driveline part.
⤢ Tap to enlargeThis page also draws on later year-by-year data for Holden Colorado to cover modern variants.
Frequently asked questions
Where is the engine number on a Holden Colorado?
It is stamped on a machined pad on the engine block. Inline sixes are on the right side above the engine mount, the 253/308 V8s on the left side above the mount, and the V6 engines on the front left face below the ignition coil. You may need to wipe the pad clean to read it.
What is the difference between an engine prefix and an engine code?
Older Holden engines use a capacity-plus-tune prefix stamped on the block, while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
Do you match engine numbers to parts?
Yes. Send us the engine code or prefix and the full stamped number, plus whether the car is automatic or manual, and we will match the right engine-related part.
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