Parts for your 2009 Holden Commodore-Camshaft sensor

2009 Holden Commodore camshaft sensor: what it does and when to replace it

Yes, the 2009 Holden Commodore uses a camshaft position sensor. This applies to VE Series models fitted with the 3.6L Alloytec V6 (LY7) and the 6.0L Gen IV V8 (L98/L76). Technical references that confirm its fitment and function include the Holden VE Commodore Service Manual (GMH), GM Global Service Information (GSI) procedures for “Camshaft Position (CMP) Sensor Replacement” on LY7 and Gen IV V8 engines, and GM/ACDelco engine management overviews. The V6 typically runs two CMP sensors (one per bank), while the V8 uses a single CMP sensor in the timing cover.

In this Commodore, the camshaft sensor tells the engine computer exactly where the cam is in its rotation. That timing info lets the ECU fire the injectors sequentially, manage spark timing cleanly, and operate variable valve timing where fitted. The upshot is crisp starts, smoother idle, better fuel economy, and lower emissions. If the sensor signal goes missing or messy, you’ll often see a check engine lamp and feel rough running, sluggish power, hard starting, or the engine cranking longer than normal. Common fault codes include P0340/P0341 for CMP circuit/performance and, on some V6s, correlation codes that can also relate to timing chain wear.

It’s not a scheduled service item, but it’s smart to give it some love during routine servicing. Under the bonnet, check the sensor connector and loom for brittle insulation, oil intrusion, or chafing, especially near the front of the cylinder heads on V6 models and around the timing cover on V8s. If replacing, use a quality OE-spec sensor, lightly oil the O-ring, seat it square, and tighten the retaining bolt to the manufacturer’s spec. Over-tightening can crack the housing. After installation, most ECUs will re-sync the cam/crank signals within a few start–stop cycles, no special relearn is usually needed.

Before throwing a new sensor at it, rule out wiring faults and, on Alloytec V6s, consider known timing chain stretch issues that can trigger cam/crank correlation faults. A quick scan with live data will show if the cam signal is clean and consistent. If the sensor is genuinely faulty, replacement is straightforward with basic tools and will restore proper timing behaviour and drivability.

• V6 (LY7): typically two CMP sensors, one per bank at the front of the heads.
• V8 (L98/L76): one CMP sensor in the timing cover near the cam gear.
• Technical sources: Holden VE Service Manual, GM GSI CMP Replacement (LY7, Gen IV V8), ACDelco/GM engine management guides.

Popular questions

Where is the camshaft sensor on a 2009 Commodore?
On the 3.6L V6, there are usually two sensors mounted at the front of the cylinder heads (bank 1 and bank 2). On the 6.0L V8, there’s a single sensor located in the front timing cover by the cam sprocket. Access is from the front of the engine bay, removing engine covers helps visibility.

What symptoms point to a bad camshaft sensor?
Expect longer crank times, a lumpy idle, flat spots under load, and a check engine light. Fault codes like P0340/P0341 are common. Note that on some Alloytec V6s, timing chain stretch can mimic sensor faults with correlation codes, so scan data and a visual check of wiring and connectors are worth doing before replacing parts.

Do camshaft sensors need regular servicing?
There’s no set replacement interval. During regular servicing, inspect the connector, wiring, and for oil leaks at the sensor O-ring. Replace the sensor only if it’s faulty or contaminated. After fitting, the ECU generally relearns on its own after a few starts and a short drive.