Parts for your 2008 Holden Commodore-Egr valve

2008 Holden Commodore EGR valve — what’s the go?

Short answer: on Australian and New Zealand–spec 2008 VE Commodores, an external EGR valve isn’t fitted or used. That applies to the common petrol engines of the day — the 3.6L Alloytec V6 (LY7/LE0), the dedicated LPG variant, and the 6.0L L98 V8. These engines control NOx emissions without a bolt-on EGR valve or EGR cooler.

Why no EGR valve? Holden’s VE powertrains use variable valve timing and precise engine management to achieve what’s called “internal EGR”. By phasing the camshafts, the ECU leaves a controlled amount of spent gas in the cylinders between cycles, cutting combustion temperatures and NOx — the same job a traditional EGR valve would do, minus the extra hardware. Fewer parts, fewer failure points, and no intake soot build-up are welcome bonuses.

Technical references backing this up include:

• Holden VE Commodore Factory Service Manual (Engine Controls sections for LY7/LE0 V6 and L98 V8): no EGR valve or EGR diagnostics listed for these engines.
• GM Powertrain High Feature V6 (HFV6) technical overview: variable cam phasing strategy provides internal EGR, eliminating external EGR hardware on petrol HFV6 applications.
• GM Global EPC/ACDelco parts catalog for VE Commodore (2008 MY): no EGR valve, EGR cooler, or EGR piping shown or superseded for the above engines.

A quick reality check for the market: the 2008 VE Commodore sold here was petrol (and LPG) only — no factory diesel variant, which is where you’d commonly see a dedicated EGR valve and cooler. If someone’s quoting an EGR valve for your 2008 Commodore, it’s likely a mix-up with another model or a generic catalogue entry.

Seeing an “EGR flow” code on a scan tool? That’s often a generic OBD menu speaking out of turn. On these engines, look instead to things that genuinely affect combustion and NOx, such as air leaks, dirty MAF, oxygen sensor ageing, or cam timing concerns (timing chain stretch on high-km V6s can throw cam correlation faults). If in doubt, confirm the RPO code (LY7/LE0/L98) from the build plate and check against Holden/GM SI procedures.

• Key engines for 2008 VE: 3.6L Alloytec V6 (LY7/LE0), 6.0L L98 V8, and 3.6L LPG Alloytec — none use an external EGR valve.

FAQs

Does my 2008 Holden Commodore have an EGR valve?
For Australian and New Zealand–delivered 2008 VE Commodores, no. The petrol V6 and V8 engines manage NOx via cam phasing and the three-way catalytic converters, so there’s no separate EGR valve to service or replace.

How does it meet emissions without an EGR valve?
By using variable valve timing to retain a controlled amount of exhaust gas in-cylinder (internal EGR), tightly managed fueling and ignition, oxygen sensor feedback, and efficient catalytic converters. This combo meets ADR requirements without the complexity of an external EGR circuit.

My scan tool shows an EGR fault — what should I check?
First, confirm the exact engine and that the tool is set to the correct vehicle profile. Generic OBD menus can list EGR-related codes even when the engine doesn’t have EGR hardware. If the MIL is on, focus on genuine VE issues: air leaks, MAF contamination, aged O2 sensors, or cam timing correlation faults on high-kilometre Alloytec V6s.