Parts for your 2012 Holden Commodore-Throttle position sensors

2012 Holden Commodore throttle-position-sensors — purpose, care, and when to replace

Technical sources including the Holden VE Series II Service Manual (Engine Controls), GM Global SI, and Bosch electronic throttle body documentation confirm the 2012 Holden Commodore (VE Series II — 3.0/3.6 V6 SIDI and 6.0 V8 L77) uses electronic throttle control. That means it absolutely has throttle-position-sensors, but they’re built into the electronic throttle body rather than being a separate, cable-era bolt-on. The accelerator pedal also carries its own position sensors. So while the part is present and critical, it’s typically serviced by addressing the complete throttle body assembly.

On this Commodore, the throttle-position-sensors (often dual, for redundancy) track the exact angle of the throttle blade. The engine control module (ECM) compares this data with the accelerator pedal position to command airflow, fuel, and ignition. This delivers smooth response, cleaner emissions, and built-in safety checks. If the two sensor tracks disagree, the ECM flags a fault and can drop the car into limp-home to protect the engine and driver.

There’s no routine replacement interval for throttle-position-sensors on a 2012 Commodore, but the throttle body benefits from periodic inspection and gentle cleaning. Under the bonnet, look for oil mist or carbon at the blade, brittle wiring, or loose connectors. When cleaning, don’t drown the electronics—use throttle-body-safe cleaner sparingly and avoid forcing the blade by hand. After any throttle work, a throttle relearn may be required (via scan tool, or a prescribed key-on/idle procedure) to settle the idle and response.

Replacement is usually warranted when faults persist, such as intermittent throttle response, surging idle, stalling, or the MIL/traction lights with codes like P0121–P0123, P0220, P2135, or P2101. Because the throttle-position-sensors are sealed within the unit, the fix is commonly a complete throttle body replacement, followed by a proper relearn and road test. Quality parts (OE or reputable aftermarket) and careful connector handling go a long way to keeping the Commodore’s drive-by-wire happy over big kilometres.

• Common signs: hesitant throttle, limp mode, hunting idle, poor economy, illuminated check-engine/ESC lights
• Good practice: check intake leaks, confirm pedal sensor data, and verify grounds and harness integrity before replacing
• Service tip: always clear codes and perform throttle relearn after any repair or cleaning

Popular questions about 2012 Holden Commodore throttle-position-sensors

Does a 2012 Commodore have a separate throttle-position-sensor I can swap?
Not as a separate piece. The TPS is integrated into the electronic throttle body, and the accelerator pedal has its own sensors. If the TPS side fails, the usual fix is replacing the throttle body assembly and carrying out a throttle relearn.

How often should the throttle body/TPS be serviced?
There’s no scheduled replacement. Inspect during regular services and clean the throttle body if idle gets rough or sticky off-idle behaviour appears—often somewhere around 60,000–100,000 km, depending on driving and oil vapour build-up. Always avoid soaking the electronics and perform a relearn after cleaning.

What fault codes point to a TPS issue on a 2012 Commodore?
Common codes include P0121, P0122, P0123, P0220, P2135, and P2101. You might also see traction/ESC lights if the ECM isn’t happy with throttle correlation. Confirm wiring and pedal sensor data before condemning the throttle body.