Parts for your 2017 Holden Commodore-Temperature sensors

2017 Holden Commodore temperature-sensors

Temperature-sensors absolutely are fitted to the 2017 Holden Commodore. Technical references including the Holden VF Series II Service Manual (Engine Controls for the 3.6L V6 LFX and 6.2L LS3), GM Service Information for the 6L50/6L80 automatic transmissions (transmission fluid temperature integral to the TEHCM), and the HVAC section (outside/ambient air temperature sensor) all describe these sensors and related diagnostics (e.g., ECT/IAT DTCs such as P0117, P0118, P0112, P0113). These sources confirm the Commodore relies on multiple temperature inputs for engine, transmission, and climate control operation.

On a 2017 Holden Commodore, temperature-sensors do more than just move a gauge needle. The engine coolant temperature (ECT) sensor tells the engine computer how warm the engine is, so it can sort out cold-start enrichment, ignition timing, idle speed, and when to kick the radiator fans in. Intake air temperature (IAT) helps with fuelling and spark adjustments as the air gets hotter or cooler, and in many models it’s built into the MAF assembly. Autos use transmission fluid temperature internally to shape shift timing and protect the gearbox, and the HVAC system relies on an ambient air temp sensor to keep the cabin comfy and the dash readout accurate.

These sensors aren’t routine “change at X km” items, but they do deserve attention during servicing. A quick scan-tool check of live data against the dash gauge and a surface temp reading at the thermostat housing is a smart move. If the ECT is reading way off, if the fans run flat-out for no reason, or if the check engine light throws codes like P0117/P0118, the sensor or its wiring may be the culprit. When replacing an ECT sensor, only open the cooling system when it’s stone cold, catch a little coolant, unplug the connector, swap the sensor, and refill/bleed with the correct Dex‑Cool spec. Use quality parts and inspect the connector for green crust or coolant wicking.

For IAT that’s integrated into the MAF, keep the air filter fresh and only clean the sensor with proper MAF-safe cleaner. The ambient sensor usually lives behind the front bumper, if the outside temp reads wildly wrong after a minor nose tap, check that little guy first. Transmission temp sensing on 6L50/6L80 units is inside the transmission (TEHCM) and isn’t a standalone service part—if it’s misbehaving, it’s a specialist job. Look after the sensors and the Commodore rewards with smooth starts, accurate gauges, and tidy fuel economy.

FAQs

Where is the engine coolant temperature sensor on a 2017 Commodore?
The ECT sits in a coolant passage near the thermostat/water outlet area on both the V6 and V8. Exact placement can vary slightly by engine (LFX V6 vs LS3 V8), so checking the Holden VF service diagram is the best way to spot it quickly. Look for a two‑pin connector on a small threaded sensor screwed into a coolant housing.

What are the common signs a temperature sensor is failing?
Think hard cold starts, rich running, poor fuel economy, radiator fans stuck on or never coming on, a dead or erratic temp gauge, and a check engine light with codes such as P0117/P0118 (ECT) or P0112/P0113 (IAT). Live data that doesn’t match reality—like showing sub‑zero temps on a warm day—is another giveaway.

Does the auto Commodore have a separate transmission temperature sensor?
Yes, but it’s built into the transmission’s internal control module/valve body assembly (TEHCM) on the 6L50/6L80, not a bolt-on external sensor. Diagnosis is via scan data and, if faulty, repairs typically involve transmission specialist work rather than a quick driveway swap.