BRAND NEW *OEM Quality* coolant temperature sensor to suit Holden Colorado RG and Colorado 7 RG with the 2.5L and 2.8L Duramax turbo diesel engine.

If your Colorado is logging a P0115 fault, showing a temperature gauge fault, or struggling to start in cold conditions - the coolant temperature sensor is a common failure point on the Duramax and a quick, inexpensive fix. Direct connector match - no modification required. Dispatched from Cranbourne VIC.

TO SUIT

This sensor suits the Holden Colorado RG 2.5L and 2.8L Duramax diesel (2012-2019) and the Colorado 7 RG 2.8L Duramax diesel wagon (2012-2017) - refer to the full compatibility list below.

OEM PART NUMBERS

12566778
12639899
55566146
96868950
5341391

OTHER PART NUMBERS

BOSCH: 0280130122
VEMO: V40-72-0332
WALKER: 211-1043

PACKAGE INCLUDES

1 x BRAND NEW coolant temperature sensor with 2-pin connector and seal ring. Thread: M12x1.5mm.

ABOUT THIS SENSOR

The coolant temperature sensor on the Colorado's Duramax diesel monitors coolant temperature and sends a signal to the ECU to manage fuel injection timing, glow plug operation, and idle speed - particularly important on a diesel during cold starts and warm-up towing conditions.

A failing sensor on the Duramax can cause hard cold starts, black smoke when warm, poor fuel economy, and temperature-related fault codes. Replacing it is a straightforward workshop job accessible from the engine bay.

COMMON SYMPTOMS OF FAILURE

Check engine light with fault code P0115 / P0116 / P0117 / P0118
Hard starting when cold - glow plug timing affected by incorrect temperature signal
Temperature gauge reading incorrectly or erratically
Black smoke or rich running when warm
Poor fuel consumption
Rough idle at operating temperature

[06/12 - 06/17] HOLDEN COLORADO 7 RG 2.8L 4cyl Duramax 2.8
[06/12 - 05/14] HOLDEN COLORADO RG 2.5L 4cyl Duramax 2.5
[06/12 - 09/13] HOLDEN COLORADO RG 2.8L 4cyl Duramax 2.8
[10/13 - 12/19] HOLDEN COLORADO RG 2.8L 4cyl Duramax 2.8
[10/13 ON] HOLDEN COLORADO RG 2.8L 4cyl Duramax 2.8

How do I test a coolant temperature sensor?

The most common test is to measure the sensor resistance with a multimeter at a known coolant temperature and compare against the manufacturer resistance curve. A cold engine (20 degrees C) typically reads 2,000 to 3,000 ohms and drops to around 200 to 300 ohms at operating temperature (90 degrees C). An OBD2 scanner showing a fixed temperature reading that does not change as the engine warms up is also a strong indicator of sensor failure.

Can a faulty coolant temperature sensor cause my engine to overheat?

Indirectly yes. If the sensor reports a lower temperature than actual, the ECU may not activate the cooling fan at the correct time, allowing the engine to overheat. It can also suppress the dashboard warning light, meaning you may not be alerted until the engine is already at a dangerously high temperature. Replace a suspected faulty sensor promptly.

Do I need to drain the coolant to replace the sensor?

Not always - many coolant temperature sensors can be replaced quickly with minimal coolant loss if you work fast and have a replacement ready to thread in immediately. However on some vehicles the sensor location requires partial coolant drainage. Check the sensor position on your specific engine before starting. Always use fresh coolant when topping up after replacement.

What are the symptoms of a faulty coolant temperature sensor?

Symptoms include poor fuel economy, black smoke, engine overheating warning, incorrect temperature gauge reading, hard starting when cold, and rough idle. Fault codes P0115 to P0119 are commonly associated with coolant temperature sensor faults.

Is it safe to drive with a bad coolant temperature sensor?

A faulty coolant temperature sensor can cause the ECU to run rich fuel mixtures and prevent the cooling fan from operating correctly, risking engine overheating. Replace it promptly - it is a low-cost part that can prevent expensive engine damage.

How do I know if my coolant temperature sensor or my thermostat is faulty?

A faulty thermostat typically causes the engine to overheat or never reach operating temperature. A faulty coolant temp sensor causes incorrect gauge readings and running issues but the coolant itself may be at the correct temperature. An OBD2 scanner showing live coolant temp data helps distinguish between the two.

Are there two coolant temperature sensors on my vehicle?

Many vehicles have two sensors - one for the ECU (engine management) and one for the dashboard temperature gauge. They look similar but are not interchangeable. Check your vehicle's service manual or contact us with your vehicle details to confirm which sensor you need.

Identification
SKU	CCS41-Colorado
Barcode #	4047024218239
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	CCS41
Reference OEM Number	12566778
Other OEM Numbers	12566778, 12639899, 55566146, 96868950, 5341391
Related Part Numbers	CCS41, CS874, TCS102, 0280130122, TS10237, TS10253
Trade Part Numbers	BOSCH: 0280130122, VEMO: V40-72-0332, WALKER: 211-1043
Product Specifics
Product Type	SENSOR
Sensor Type	Coolant Temperature Sensor
Thread Size	M12x1.5 mm
Spanner Size	19 mm
Number of pins	2-Pin
Connector Shape	oval
Housing Colour	Black
Compatible Makes	Holden
Fitment Type	Direct Replacement
Other Details
Note	Always verify fitment using your vehicle's OEM part number.