Parts for your 2008 Holden Colorado-Throttle position sensors

2008 Holden Colorado throttle-position-sensors: what they do and how to look after them

From the Holden RC Colorado Workshop Manual (2008–2011), GM Global Service Information (SI), and the Isuzu 4JJ1/4JK1 engine service manuals, it’s clear the 2008 Holden Colorado does use throttle-position sensing. Petrol variants with the 3.6L Alloytec run an electronic throttle body that contains dual throttle-position-sensors (TPS) for redundancy. Diesel models (4JJ1/4JK1) use an electronically controlled intake throttle valve with a position sensor, and the accelerator pedal has its own position sensors. So, throttle-position-sensors are absolutely relevant on this model year.

On this Colorado, the TPS tells the engine control module how far the throttle butterfly is open. That data is used to manage fuel, spark (petrol), EGR and idle control, and to keep emissions and drivability on point. Dual-track sensors are there so the ECU can cross-check signals, if they don’t agree, it throws a code and often drops into limp mode to protect the engine.

Typical hints the TPS system needs attention include:

• Hesitation, surge, or a dead spot on light throttle
• Rough idle, stalling when coming to a stop, or poor fuel economy
• Fault codes such as P0120–P0124 or P2135 (correlation) on petrol, intake throttle/EGR-related codes on diesels

Servicing tips for the 2008 Holden Colorado throttle-position-sensors:

• They’re not a routine replacement item, but inspect the connectors every service. Look for green corrosion, loose pins, or damaged insulation near the throttle body and pedal.
• If cleaning the throttle body, use sensor-safe cleaner sparingly. Don’t force the throttle plate open by hand on drive-by-wire units.
• Battery and charging health matter—low voltage can trigger TPS correlation faults. Test and correct supply issues first.
• If replacing the throttle body or a TPS-equipped assembly, use the correct part number and a fresh gasket where applicable. Perform a throttle/idle relearn with a Tech 2 or a capable scan tool. Some diesels also need intake throttle and EGR adaptation.
• After-market pedals or throttle controllers can confuse TPS/APP correlation. Remove them during diagnosis.

Replacement is straightforward for a trained tech: confirm the fault with live data, inspect wiring, swap the affected component (throttle body or intake throttle valve on diesels), and complete the relearn. Done right, the Colorado goes back to crisp throttle response and tidy fuel use, whether it’s commuting or hauling down the motorway.

FAQs

Does a 2008 Holden Colorado actually have a throttle-position-sensor?
Yes. Petrol models have dual TPS within the electronic throttle body, and diesels use an intake throttle valve with a position sensor plus an accelerator pedal position sensor. This layout is documented in the Holden RC Colorado workshop information and Isuzu 4JJ1/4JK1 engine manuals.

What symptoms point to a failing TPS on a 2008 Colorado?
Drivers may notice flat spots, surging, rough idle, or limp mode. The check engine light often appears with codes like P0120–P0124 or P2135 on petrol variants, while diesels may log intake throttle/EGR control faults. Always check wiring and power/grounds before replacing parts.

Is TPS replacement a DIY job on this model?
It can be, but a scan tool that can read live data and perform a throttle/idle relearn is strongly recommended. Incorrect installation or skipping the relearn can cause high idle, poor drivability, or repeat fault codes. Many owners opt to have a workshop handle it to save time and hassle.