Parts for your 2019 Holden Colorado-Throttle position sensors

2019 Holden Colorado throttle position sensors (TPS)

Referencing Holden/GM Service Information for the RG Colorado (2017–2020) and common OBD-II diagnostics, the 2019 Holden Colorado 2.8L Duramax diesel does use a throttle position sensor. It’s built into the electronically controlled intake throttle valve (throttle body). Diagnostic trouble codes such as P2101 (Throttle Actuator Control), P2119 (Throttle Closed Position Performance) and TP circuit range codes (e.g., P0122/P0123) listed in GM SI, along with parts catalogues showing an intake throttle body with dual position sensors, confirm the TPS is fitted on this model.

On the 2.8 diesel, the TPS doesn’t run the engine like a petrol throttle does. Instead, it reports the angle of the intake throttle plate the ECU commands for emissions control, smooth shutdown, EGR flow management and certain drivability strategies. The truck is fully drive‑by‑wire: the accelerator pedal has its own sensors for driver demand, and the throttle body uses the TPS to verify the plate is where the ECU wants it. If the readings don’t line up, the ute can drop into limp mode to protect itself.

There’s no set replacement interval for the TPS on a Colorado, it’s replaced only if it’s faulty. Because the TPS is integrated into the throttle body, the whole assembly is usually swapped out. As part of servicing, it’s worth inspecting the intake tract for oil mist build-up that can gum up the throttle plate, checking the connector and loom for rub-through near the housing, and scanning live data to confirm stable, matching TP sensor signals. If cleaning is needed, avoid forcing the plate by hand and use a sensor‑safe throttle cleaner sparingly. Disconnect the battery before unplugging, and always fit a new gasket if the body is removed.

• Common warning signs:
  • Reduced power, rough idle after cold start, or stalling on shutdown
  • Check engine light with codes like P2101, P2119, P0122–P0123, P2135
  • Poor EGR performance or increased soot

After replacing the throttle body/TPS, a throttle/idle learn with a capable scan tool (e.g., GDS2/Tech 2 equivalent) is recommended. Clear any faults, perform the learn procedure, then road test. If issues persist, check the accelerator pedal position sensors and EGR valve operation, as faults there can mimic TPS problems.

FAQs

Does the 2019 Holden Colorado have a throttle position sensor?
Yes. The RG Colorado 2.8L diesel uses an electronic throttle body with dual built‑in throttle position sensors. They let the ECU confirm the commanded plate angle for EGR and emissions strategies, and they trigger limp mode if readings are implausible.

How often should the TPS be replaced on a Colorado?
There’s no scheduled interval. Replace it only if diagnostic testing confirms a fault. During regular servicing, inspect wiring, check for oily deposits in the intake and verify TP sensor data with a scan tool. Many issues are solved with cleaning and connector repairs rather than replacement.

Do I need a relearn after fitting a new throttle body/TPS?
Yes, a throttle/idle learn is recommended. Use a suitable scan tool to run the calibration so the ECU knows the new closed and open positions. Clear codes, let the engine idle to stabilise, and take a short drive cycle to confirm no fault codes return.