Parts for your 2017 Holden Commodore-Egr valve

2017 Holden Commodore EGR valve – what’s fitted and what to service

Based on Holden and GM Service Information for VF Series II and early ZB models, an external EGR (exhaust gas recirculation) valve is not fitted to 2017 Commodore petrol engines, but it is fitted to the late‑2017 ZB diesel. GM’s technical data for the VF 3.6L V6 (LFX) and 6.2L V8 (LS3) shows no external EGR hardware, relying instead on variable cam phasing and a three‑way catalytic converter. GM/Opel documentation for the ZB 2.0 CDTi (B20DTH) details an electronically controlled, cooled EGR system with an EGR cooler. These sources are the Holden VF Series II and ZB Service Manuals (GM SI/GlobalConnect) and GM Powertrain engine control descriptions.

• VF Series II 3.6L V6 (LFX) – no external EGR valve (internal EGR via cam phasing)
• VF Series II 6.2L V8 (LS3) – no EGR valve
• ZB 3.6L V6 (LGX) and 2.0L turbo petrol (LTG) – no external EGR valve
• ZB 2.0L turbo diesel (B20DTH/CDTi) – fitted with cooled EGR valve and EGR cooler

Why most 2017 Commodores don’t use an EGR valve: GM’s petrol engines of this era meet ADR 79 emissions using precise fuel control, variable valve timing that provides “internal EGR”, and high‑efficiency catalysts. Deleting the external EGR hardware reduces soot‑related issues and keeps the intake cleaner, while still hitting NOx targets per GM’s engine control strategy outlined in the VF and ZB engine descriptions.

For 2017 ZB diesel owners where an EGR valve is fitted, here’s the practical lowdown. The EGR valve meters a measured amount of exhaust gas back into the intake to lower combustion temperatures and slash NOx. On the B20DTH 2.0 CDTi, it’s an electronic unit working with a dedicated EGR cooler. The valve and cooler sit near the intake manifold, with coolant lines and a position‑sensed actuator. It’s part of a wider emissions package that includes the DPF, and on some specs, SCR. When it’s healthy, drivability is smooth and NOx is kept in check, when it sticks or the cooler clogs, expect a check engine light (often P04xx codes), rough idle, soot buildup, higher fuel use, or limp‑home behaviour.

Servicing tips that line up with the Holden/Opel workshop guidance: during regular servicing around 60,000–100,000 km, inspect for soot accumulation at the valve and cooler, check electrical connectors, and look for coolant leaks at the cooler. A scan tool can command the valve and verify position feedback, software updates may refine control logic, so it’s worth asking the dealer or a GM‑capable workshop. Many valves can be cleaned if they’re sooted but not electrically failed, replace if the motor or position sensor is out of spec. Always fit new gaskets, torque to spec, and bleed the cooling system after any cooler work. After replacement, perform the EGR relearn/adaptation with a scan tool and clear codes. Use quality diesel and give the car the occasional longer run to help manage soot loading across the EGR/DPF system. Avoid blanking or deleting the EGR – that’s illegal in AU/NZ and can trigger faults, higher NOx, and warranty or insurance dramas.

• Pro tip: if repeat EGR faults occur, check upstream causes – split boost hoses, intake leaks, or a loaded DPF can all upset EGR flow checks.

FAQs

Does a 2017 Holden Commodore have an EGR valve?
It depends on the engine. VF Series II petrol models (LFX V6, LS3 V8) and ZB petrols don’t have an external EGR valve. Late‑2017 ZB diesels (2.0 CDTi B20DTH) do have a cooled EGR valve and cooler. This split is confirmed by the Holden/GM Service Manuals and GM Powertrain control descriptions.

What are the signs the EGR valve needs attention on a 2.0 CDTi ZB?
Common flags include a check engine light with P04xx codes, rough idle, sluggish response, higher fuel consumption, smoke, or limp mode. A sooted‑up valve or cooler is typical, a scan tool test, visual inspection, and checking for coolant leaks at the EGR cooler will point the way.

Can the EGR valve be cleaned, or should it be replaced?
Light to moderate soot build‑up can often be cleaned if the actuator and position sensor test OK. If the motor or sensor is out of range, replace the valve. After any work, use a scan tool to perform EGR adaptation and clear codes. Always use new gaskets and follow torque and coolant bleed procedures.