Parts for your 2005 Holden Commodore-Map sensor

2005 Holden Commodore MAP sensor: what it is, where it lives, and how to keep it happy

Per the Holden VZ Commodore Service Manual (Engine Controls, 3.6L V6 LE0/LY7), GM Service Information for the 2005 VZ range, and Bosch/ACDelco application data, a MAP (Manifold Absolute Pressure) sensor is fitted to all 2005 Holden Commodores. That includes the 3.6L Alloytec V6 and the 5.7L LS1 V8. On the V6 it’s mounted on the upper intake manifold, on the LS1 it sits in the intake manifold near the throttle body. So yes—this part absolutely matters on a 2005 Commodore.

The MAP sensor tells the engine computer (ECM) the actual pressure inside the intake manifold. Paired with intake air temperature and rpm, it lets the ECM figure out engine load and the correct fuel and spark for smooth running. On the VZ, the MAP also works alongside the MAF, the ECM blends both signals for crisp throttle response and uses the MAP for altitude compensation and as a backup if the MAF plays up. That’s why a crook MAP often shows up as rough idle, flat spots, higher fuel use, or fault codes like P0106, P0107, or P0108.

It’s not a scheduled service item, but it’s smart to give it some attention every 100,000–150,000 kilometres or if drivability dips. Under the bonnet, check the MAP sensor connector for loose pins or green crust, make sure the harness isn’t rubbing through, and inspect the O-ring where the sensor seals to the manifold. On engines that use a grommet or short vacuum stub, make sure there are no splits. Oil mist and carbon can build up in the manifold port—if it’s dirty, wipe the port gently and avoid flooding the sensor with cleaners.

When replacement is needed, stick with OE-quality parts (ACDelco, Bosch, Delphi) so the calibration matches what the ECM expects. Swapping one is straightforward:

• Switch ignition off, remove the engine cover, unplug the connector.
• Remove the retaining screw, ease the sensor out, and check the O-ring.
• Lightly oil a new O-ring, seat the new sensor squarely, and refit the screw.
• Reconnect the plug, clear any codes, and take a short test drive to let trims settle.

A quick scan-tool check helps confirm health: with key on/engine off the MAP should read near local barometric pressure (~100 kPa at sea level). At hot idle, expect roughly 28–45 kPa depending on cam and tune. Readings stuck, wildly noisy, or out of range usually point to a sensor, wiring, or vacuum leak issue rather than a mystery gremlin.

Popular questions

Where is the MAP sensor on a 2005 Holden Commodore?
The 3.6L Alloytec V6 has it on the upper intake manifold, typically towards the rear of the plenum. The 5.7L LS1 V8 locates it in the intake manifold near the throttle body. It’s a small, two- or three-pin sensor that seals with an O-ring.

What are the symptoms of a failing MAP sensor?
Common signs include rough idle, sluggish acceleration, poor fuel economy, rich running, hard starts, and the check engine light with codes like P0106, P0107 or P0108. Always rule out vacuum leaks and wiring issues before condemning the sensor.

Does the MAP sensor need regular cleaning?
It’s not a routine service item. If the manifold port is oily or carboned up, clean the port carefully and inspect the O-ring. Avoid soaking the sensor in solvent. Replace the sensor if readings are out of whack or it fails diagnostics.