Parts for your 2020 Holden Astra-Throttle position sensors

2020 Holden Astra throttle position sensor (TPS)

Yes — the 2020 Holden Astra uses a throttle position sensor, integrated into its electronic throttle body. Technical sources back this up: GM Global Service Information (Astra K/BK, 2016–2020) under Engine Controls details Electronic Throttle Control with dual-track throttle position sensing, and Opel/Vauxhall TIS lists DTCs P0121, P0122, P0123 and P2135 for the Astra K, all of which specifically monitor throttle position sensor circuits. Holden BK Astra wiring diagrams also show dual TP sensor signals in the throttle body and a separate dual-track accelerator pedal position sensor. That confirms the TPS is fitted, monitored and critical to how the Astra runs.

On this Astra, the TPS tells the engine computer exactly how far the throttle plate is open, so fuelling, ignition timing and turbo response all stay crisp and efficient. Because it’s drive-by-wire, smooth pedal feel, steady idle and clean gear changes rely on the TPS and the paired accelerator pedal sensor staying in sync.

There’s no scheduled replacement for the TPS, but it’s worth a look during regular servicing if any of the following crop up:

• Erratic idle, flat spots or sudden loss of power/limp mode
• Surging on cruise, rough cold start, higher-than-normal fuel use
• Engine light with codes like P0121–P0123, P0220–P0223 or P2135

On the 2020 Astra the TPS is built into the throttle body, so faults typically mean replacing the complete throttle body assembly rather than just a sensor. A few handy tips:

• Perform a proper throttle/idle relearn with a scan tool after replacement or battery disconnect. The ECM needs to recalibrate the throttle plate position.
• Don’t force the throttle plate by hand. If cleaning, use a quality throttle-body-safe cleaner and a light touch to remove carbon at the bore and edge of the plate.
• Check the connector for oil wicking or moisture, and inspect harness routing for rub-through near the intake.
• If codes point to correlation issues (e.g., P2135), compare live data for TP1/TP2 and the pedal sensors. Replace the throttle body only after ruling out wiring and ground faults.
• Use a quality OE-equivalent unit and a new gasket/O-ring. Torque fasteners evenly to avoid air leaks.

Treated right, the Astra’s TPS setup is low-maintenance and reliable. When it does play up, a clean diagnostic approach and a proper relearn get it back to its tidy, Aussie-and-Kiwi-commute-friendly best.

Popular questions

Does the 2020 Holden Astra have a separate, replaceable TPS?

No. The throttle position sensing is integrated into the electronic throttle body as a dual-track sensor. If the sensor fails or goes out of range, the usual fix is replacing the complete throttle body assembly and performing a throttle/idle relearn.

What are the signs the TPS on a 2020 Astra needs attention?

Common signs include an engine light with codes like P0121–P0123 or P2135, a hunting or high idle, hesitation off the line, limp mode, or noticeable surging on cruise. Technicians will confirm by checking live data for TP1/TP2 agreement and harness integrity before replacing the throttle body.

Is there routine maintenance for the TPS on this model?

There’s no set interval, but during servicing it’s smart to inspect the throttle body for carbon build-up, clean it carefully if needed, and check the connector and wiring. Any replacement should be followed by a scan-tool relearn so the ECM knows the new throttle plate positions.