Parts for your 2015 Holden Commodore-Throttle position sensors

2015 Holden Commodore Throttle Position Sensors (TPS)

Based on Holden/GM Service Information for the VF Commodore (Engine Controls – Description and Operation), these models run electronic throttle control (“drive‑by‑wire”) with an electric throttle body that houses two throttle position sensors (TPS1/TPS2). GM diagnostic routines and DTCs such as P0121, P0122, P0123, P0220, P2135 in the VF Commodore manuals further confirm the TPS is fitted and monitored. Component descriptions in AC Delco/GM parts catalogues and Bosch electronic throttle body documentation also specify dual, non‑serviceable TPS tracks integrated into the throttle body. So, a throttle position sensor is absolutely relevant and used on the 2015 Holden Commodore.

On this Commodore, the TPS tells the engine computer exactly how far the throttle plate is open. With that info, the ECU trims fuel, spark and idle speed, keeps emissions tidy and delivers the right punch when the loud pedal’s pressed. Because the system is drive‑by‑wire, the TPS works alongside the accelerator pedal position (APP) sensors to validate driver demand and throttle angle. If the readings don’t line up, the car can jump into “Reduced Engine Power” to keep things safe.

As part of regular servicing, it pays to give the throttle body some attention. The TPS itself isn’t a separate service item on most VF engines (it’s built into the throttle body), but good habits go a long way:

• Check for stored codes (P0121, P0220, P2135) and address wiring/connectors at the throttle body for corrosion or loose pins.
• Clean the throttle bore and plate with appropriate throttle cleaner to prevent sticky operation and erratic idle.
• If the throttle body is replaced, perform a throttle/idle relearn with a scan tool (or the prescribed key‑on cycle if allowed in GM SI).

Common symptoms of a crook TPS signal include rough or high idle, surging, hesitation, poor fuel economy, and the dreaded “Reduced Engine Power” message. If testing points to a failed TPS on a VF, the fix is typically a complete throttle body replacement rather than swapping a separate sensor. Expect to remove intake ducting, unplug the connector, undo the mounting bolts, and refit with the correct O‑ring seal. Tighten to the specified torque (refer to GM SI for the exact figure), reconnect, then carry out the relearn. A fresh throttle body paired with a proper relearn usually restores smooth take‑off and stable idle, keeping the Commodore happy on Aussie and Kiwi roads for many more kilometres.

Popular questions

Does a 2015 Holden Commodore actually have a throttle position sensor?
Yes. The VF Commodore uses an electronic throttle body with dual, built‑in throttle position sensors (TPS1/TPS2). This setup is detailed in Holden/GM Service Information and is supported by factory trouble codes like P0121 and P2135, which specifically monitor TPS performance and correlation.

Can the TPS be replaced on its own, or is it the whole throttle body?
On most VF engines, the TPS is not a separate service part. It’s integrated into the throttle body, so the usual repair is to replace the complete throttle body assembly, then perform a throttle/idle relearn using a scan tool.

What maintenance helps prevent TPS‑related dramas?
Regularly inspect the throttle body connector, keep the throttle bore clean, and scan for early fault codes during scheduled servicing. After battery disconnection or throttle body work, complete the relearn procedure to prevent unstable idle or reduced power messages.