Parts for your 2020 Holden Colorado-Throttle position sensors

2020 Holden Colorado throttle-position-sensors: what they do and how to look after them

Referencing GM Service Information (SI) for MY2017–2020 Colorado/Trailblazer with the 2.8L Duramax diesel (RPO LWN), the model runs an electronically controlled intake-air throttle body that houses dual throttle-position sensors (TPS). The accelerator pedal module also carries dual-track position sensors. The Holden Colorado Workshop Manual and ACDelco parts catalogues list these components, and factory diagnostics include TPS-related DTCs such as P0121–P0123, P2135 and P2101. That makes throttle-position-sensors absolutely relevant and used on the 2020 Holden Colorado.

On this diesel ute, the TPS in the intake throttle body tells the engine control module (ECM) exactly where the throttle plate sits, letting it fine-tune EGR flow, smooth out shutdown, stabilise idle after cold starts, and keep torque delivery nice and linear. Paired with the accelerator pedal’s sensors (which report driver demand), the ECM blends air, fuel and boost for clean, quiet, reliable performance. It’s also how cruise control and the auto’s shift strategy stay tidy under load.

There’s no routine replacement interval for throttle-position-sensors, they’re sealed and designed to last. As part of regular servicing, it’s smart to:

• Scan for stored or pending TPS/APP codes (P0121–P0123, P2135, P2101) at each service.
• Visually check the intake throttle body connector and loom for rub-through, oil mist or corrosion.
• Keep the air path clean. If cleaning the throttle body, don’t force the blade by hand, disconnect the battery and use appropriate cleaner sparingly.
• Ensure good engine and body grounds to minimise sensor noise and voltage drop.

Replacement is straightforward but benefits from a methodical approach. Use quality OEM-equivalent parts, fit a fresh gasket, and torque fasteners correctly. After replacement, perform a throttle/idle relearn with a capable scan tool (many units self-calibrate at key-on, but a guided relearn is safest). Clear codes, check live data for smooth, matching TP sensor tracks, and road test to confirm no limp-home behaviour. If the ECM flags correlation faults, don’t forget the accelerator pedal module—its dual sensors must agree with the throttle body’s position feedback.

Common signs the Colorado’s TPS circuit needs attention include erratic throttle response, sudden reduced-power mode, harsh or clunky shutdown, surging at light throttle, poor DPF regen frequency, and the MIL glowing with the codes above. Catching small connector or wiring issues early usually saves replacing hardware unnecessarily.

Popular questions

Does a 2020 Holden Colorado actually have a throttle-position sensor?
Yes. The 2.8L Duramax diesel uses an electronic intake-air throttle with dual TPS inside, and the accelerator pedal has its own twin position sensors. Both sets feed the ECM so it can manage torque, EGR and drivability.

What are the symptoms of a failing TPS on a Colorado 2.8 diesel?
Drivers might notice lazy or jumpy throttle response, limp mode, a rough or thumpy shutdown, and the MIL on. Scan tools often show P0121–P0123, P2135 or P2101. Sometimes it’s just a connector or wiring issue rather than the sensor itself.

Do TPS parts need calibration after replacement?
The ECM typically relearns the new part at key-on, but a proper throttle/idle relearn with a scan tool is best practice. After fitting, clear codes, run the relearn, then verify the two TP tracks move smoothly and match expected percentages in live data.