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Holden Trailblazer Engine Number
Use this guide to locate the engine number on your Holden Trailblazer and line up the right engine-related parts enquiry.
The Holden Trailblazer (RG series, built 2016 to 2020) is a body-on-frame, seven-seat 4×4 wagon derived from the Holden Colorado RG ute and powered by a 2.8-litre turbo-diesel "Duramax" four. It arrived in 2016 as a straight renaming of the earlier Holden Colorado 7, so the two names refer to essentially the same wagon across its life.
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 Trailblazer runs the 2.8-litre turbo-diesel "Duramax" inline-four, the same engine used in the Colorado RG, so it is identified by its GM/Duramax engine designation and its stamped serial rather than by the older Holden engine-prefix system. This unit is commonly referred to as the 2.8 Duramax four and carries a GM RPO/engine code (widely cited as LWH); confirm the exact code from the engine or documentation before relying on it. The definitive identifier on the vehicle is the number physically stamped into the engine block, which should be read directly rather than inferred. When matching diesel components, quoting both the Duramax 2.8 engine designation and that stamped block number gives the clearest identification.
This page also draws on later year-by-year data for Holden Trailblazer to cover modern variants.
Frequently asked questions
Where is the engine number on a Holden Trailblazer?
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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