Parts for your 2019 Holden Commodore-Exhaust mount

2019 Holden Commodore exhaust mount

Technical sources confirm the 2019 Holden Commodore (ZB, E2XX platform) is fitted with exhaust mounts, also called exhaust hanger insulators. In Holden/GM Service Information (SI) procedures for ZB Commodore exhaust and muffler replacement, technicians are instructed to support the exhaust and remove the rubber insulators from the hangers before loosening brackets. The GM Global Electronic Parts Catalogue (EPC) also lists multiple “exhaust hanger insulator” positions for the ZB (centre and rear locations across 2.0T petrol, diesel, and 3.6L V6 AWD variants). These sources make it clear the vehicle uses exhaust mounts as standard.

On the 2019 Commodore, the exhaust mounts do the quiet, important work. They carry the weight of the pipes, resonators and mufflers while isolating vibration, so the cabin stays calm and the system doesn’t thump against the floor or bumper. They also keep the tailpipes aligned in the bumper cut-outs and protect the catalytic converters and flex joints from stress by allowing a little movement without metal-on-metal contact. GM labels them “insulators” for a reason — they’re there to soak up noise, vibration and harshness.

As part of regular servicing, it’s smart to check the mounts whenever the car’s on a hoist. Look for perished or cracked rubber, elongated holes, or stretched mounts that let the rear muffler droop. Typical symptoms of a tired mount include:

• Exhaust knock over bumps or at start-up
• Extra vibration or drone at idle and on take-off
• Tailpipe sitting low or off-centre in the bumper

Replacement is straightforward but best done with the exhaust cool and safely supported. A dab of silicone spray helps slide old mounts off the hangers, avoid petroleum-based products that attack rubber. If one mount has failed, replacing the pair on that section (left/right rear on V6 AWD, for example) keeps the system sitting even. Stick with genuine or quality OEM-equivalent rubber insulators for factory NVH, firmer polyurethane can sharpen response but may add cabin buzz. After fitting, check clearances to the subframe, heat shields and bumper, and ensure no contact across the full engine rock range. Expect roughly 30–60 minutes with the right pliers and a jack stand or hoist.

Service intervals vary with climate and driving conditions, but a quick look every service and proactive replacement around the 80,000–120,000 km mark helps avoid cracked mounts leading to exhaust leaks, rattles or bumper scuffs. These little rubber heroes are cheap insurance for a quiet Commodore.

FAQs

How often should exhaust mounts be replaced on a 2019 Holden Commodore?
They don’t have a fixed interval. Inspect at each service and replace when rubber shows cracking, stretching or if the exhaust sags or knocks. Many owners see replacement somewhere between 80,000 and 120,000 km, sooner if the car tows or lives near the coast.

What are the signs of a failing exhaust mount on a ZB Commodore?
Look for a droopy or off-centre tailpipe, new rattles or thumps over bumps, vibration or drone at idle, and visible splits in the rubber insulator. If you can move the muffler by hand and it clangs on a heat shield, the mounts are likely tired.

Can polyurethane mounts be used instead of rubber?
Yes, but they’re stiffer. That can improve support and reduce movement, helpful on performance setups, but it can also increase vibration in the cabin. For most daily-driven Commodores, quality OE-style rubber insulators keep the NVH balance spot on.