Parts for your 2017 Holden Commodore-Knock sensor

2017 Holden Commodore knock sensor — purpose, replacement and servicing tips

Based on technical sources including Holden/GM Service Information (SI) for VF Series II, the Holden VF Series II Workshop Manual, ACDelco parts and service catalogues (EPC/TDS), and GM diagnostic references (GDS2/DTC lists), the 2017 Holden Commodore does use knock sensors across its engine range. Both the 3.6‑litre V6 and the 6.2‑litre LS3 V8 are equipped with two knock sensors monitored by the engine control module (ECM). These sources specify fitted knock sensors and related diagnostic trouble codes (such as P0325/P0330), confirming the component is relevant to this model year.

On a 2017 Holden Commodore, the knock sensor’s job is to “listen” for detonation (pinging) and let the ECM trim ignition timing to protect the engine. That means better reliability on our variable Aussie and Kiwi fuels, smoother running up hills or when towing, and the best blend of power and economy without risking piston or bearing damage.

Common signs of a crook or noisy knock sensor circuit include a check engine light, dull performance, rough running under load, higher fuel use, and occasional rattly pinging. The ECM will usually pull timing to stay safe, so it can feel a bit flat compared with normal.

For servicing, the sensor itself isn’t a regular consumable, but it should be considered if there’s a detonation or knock-related fault code, after coolant or oil leaks into the valley/onto the block, or when doing intake/manifold-off work (V6) or exhaust/side-of-block access (LS3). Good practice is to:

• Scan for codes (e.g., P0324–P0334) and view knock retard data before replacing parts.
• Inspect the harness and connectors for heat or oil damage, wiring faults are common.
• Only fit quality, correct-spec sensors, cheapies can be too sensitive or deaf.
• Install on a clean, dry, flat boss with no sealant under the sensor, use a torque wrench to the factory spec.
• Clear codes and road test under load to confirm proper timing control.

Owners who’ve done big kays, frequent towing, track days, or who’ve had cooling or oil issues should have the area checked during scheduled services. Using the recommended fuel grade, keeping the cooling system healthy, and fixing intake/exhaust leaks helps the ECM and knock sensors do their best work.

FAQs

Where are the knock sensors on a 2017 VF Series II Commodore?
On the 3.6‑litre V6, they’re mounted on the engine block beneath the intake area, so the manifold usually needs to come off for access. On the LS3 V8, they’re fitted to the sides of the block, generally accessed from underneath or with exhaust components moved, depending on the workspace.

Can a bad knock sensor damage the engine?
The sensor itself won’t, but if it can’t detect knock, detonation may go unchecked. The ECM often goes safe by pulling timing, which protects the engine but hurts performance. Ignoring persistent knock or related fault codes can risk internal damage over time, so it’s worth sorting promptly.

Do knock sensors need routine replacement?
Not on a schedule. They’re replaced when faulty, contaminated, or if diagnostics point to a failed sensor or harness. Always verify with scan data and a proper inspection before swapping parts.