Parts for your 2012 Holden Colorado-Throttle position sensors

2012 Holden Colorado throttle-position sensor: is it actually used?

Short answer: no, a conventional, stand-alone throttle-position sensor (TPS) isn’t used on the 2012 Holden Colorado sold in Australia and New Zealand. Technical references including the Holden RG Colorado (2012) workshop manual (Engine Controls), GM Global Service Information, and Bosch EDC17 diesel management material show the 2012 RG lineup here was diesel-only and drive-by-wire. Diesel engines don’t meter engine load with a throttle butterfly the way petrol engines do, so there’s no separate TPS bolted to a throttle shaft as a service item.

Instead, the Colorado’s diesel uses two key bits of hardware: an accelerator pedal position (APP) sensor at the pedal, and an electronically driven intake throttle valve (sometimes called an intake air control/throttle body) used mainly for EGR flow control and smooth shutdown. That throttle unit has its own internal motor and position feedback sensor built in. If it plays up, the assembly is diagnosed and typically replaced as a unit, there isn’t a removable TPS to swap on its own. Holden’s service info also calls for throttle actuator tests and post-repair learn procedures via a scan tool, rather than any TPS adjustment.

Why did Holden/GM do it this way? On a modern common-rail diesel, torque is controlled by fuelling, not by choking airflow. The “throttle” plate is there to help emissions and drivability, so its position is managed by the ECU with integral feedback. That’s why parts catalogues for the 2012 RG diesel list items like Accelerator Pedal Module and Intake Air Throttle Valve, but not a discrete TPS.

Owners chasing “TPS” problems on these Colorados should think in diesel terms. Common clues of intake throttle or position feedback trouble include a “Reduced Engine Power” message, limp-mode, poor EGR performance, shudder on shutdown, or DTCs relating to throttle actuator performance/position. Techs will check wiring/connectors, perform actuator tests, and may clean light soot from the throttle bore if it’s sticking. If the internal sensor or motor is faulty, the fix is replacement of the throttle body assembly followed by an ECU relearn. Likewise, odd throttle response can stem from a failing accelerator pedal position sensor rather than any traditional TPS.

Sources referenced: Holden RG Colorado (2012) Workshop Manual – Engine Controls, GM Global Service Information (GSI), Bosch EDC17 diesel management overview, Holden Australia 2012 model/engine release details.

FAQs

Does a 2012 Holden Colorado have a throttle-position sensor?
Not as a separate, serviceable part. The diesel models use an accelerator pedal position sensor and an electronically controlled intake throttle unit with an internal position sensor. There’s no bolt-on TPS like a petrol engine’s throttle body would have.

What are the symptoms of a faulty intake throttle or its position feedback on a 2012 Colorado diesel?
Expect “Reduced Engine Power,” limp-mode, harsh or shuddering shutdown, unstable idle, EGR-related faults, and stored DTCs for throttle actuator performance/position. A scan-tool actuator test and wiring checks will usually pinpoint the issue.

Can the TPS be cleaned or replaced separately on a 2012 Colorado?
No. Light soot can be cleaned from the intake throttle bore, but the position sensor is integrated. If it fails, the whole intake throttle assembly is replaced and an adaptation/relearn is performed with a scan tool. If throttle response feels odd, the accelerator pedal module is another item to test.