Parts for your 2015 Holden Commodore-Temperature sensors

2015 Holden Commodore temperature-sensors — what they do and how to look after them

Temperature-sensors are absolutely used on the 2015 Holden Commodore (VF series). Holden’s VF Commodore Workshop Manual (MY14–MY17) and GM Service Information (SI) detail multiple temperature inputs: the engine coolant temperature (ECT) sensor in the cylinder head/water jacket, intake air temperature (IAT) sensor (often integrated with the MAF on V6), ambient air temperature sensor at the front of the vehicle, transmission fluid temperature (auto), and A/C-related sensors. The engine control module (ECM) and transmission control module (TCM) rely on these sensors for fuel, spark, idle, fan control and shift strategy. Parts listings from AC Delco/GM and Holden dealer catalogues for VF models also show distinct temperature-sensor part numbers across the range.

On a 2015 Commodore, the temperature-sensors are there to keep the driveline happy and efficient. The ECT sensor tells the ECM how hot the engine is so it can sort cold starts, mixture, ignition timing and turn the radiator fans on when needed. The IAT helps with air–fuel trims as conditions change. The ambient sensor feeds the HVAC and cluster, while the auto trans fluid temperature helps the TCM manage shift feel and protection. If any of these go out of whack, drivers can see rough running, poor economy, hard starts, high fan speeds, or warning lights.

They’re not high-maintenance items, but they do appreciate a bit of care during regular servicing. Best practice on a VF:

• Scan live data on a cold start: ECT and ambient should be close. A big mismatch points to a dodgy sensor or wiring.
• Inspect connectors and looms for corrosion, oil wicking or rub-through, especially near the thermostat housing, front bumper and airbox.
• Keep to the correct coolant type and change intervals per the service schedule, old or contaminated coolant can mistreat the ECT sensor and thermostat.
• If fitted with a MAF-integrated IAT, clean the MAF gently with appropriate cleaner—never touch the element.

When replacement is needed, genuine or quality OEM-equivalent sensors are the go. For an ECT swap, let the engine cool fully, relieve system pressure, drain enough coolant to drop below the sensor, then replace the sensor and new seal/O-ring as specified in the manual. Torque to spec from the Holden/GM service info, top up with the right coolant mix, and bleed the system so there’s no air trapped. For IAT or ambient sensors, it’s usually a simple unplug-and-swap, but always check routing and clip positions so readings stay spot-on. A quick road test and a scan tool check to confirm plausible temperatures will save headaches and keep the Commodore running sweet as.

Popular questions about 2015 Holden Commodore temperature-sensors

How many temperature-sensors does a 2015 VF Commodore have?
Most have at least an engine coolant temperature sensor, intake air temperature sensor, and ambient air temperature sensor. Auto models also monitor transmission fluid temp, and the HVAC uses additional temperature inputs. Exact count depends on engine and trim, but multiple sensors are standard.

What are the signs the coolant temperature sensor is failing?
Common symptoms include hard cold starts, rich running, poor fuel economy, fans running unexpectedly, an erratic gauge, or a check engine light. A scan tool showing ECT readings that don’t match a cold ambient start is a classic giveaway.

Do temperature-sensors need regular replacement?
They’re not routine service items. Replace only if faulty, contaminated, damaged or outside spec. Following the service schedule, using the correct coolant, and keeping connectors clean usually means they last for years without dramas.