Chevrolet Spark Engine Coolant Temperature Sensor Guide (2011-2022)
Understanding the signs of a failing coolant temperature sensor and how to choose the right replacement for your Spark.
- A faulty ECT sensor can cause a Check Engine Light (P0118), poor fuel economy, overheating, and rough running.
- Replacement is a simple and inexpensive DIY task for most owners, typically taking less than 30 minutes.
- ACDelco is the original equipment manufacturer and a highly recommended choice for reliability.
- Do not ignore symptoms; a bad sensor can lead to reduced performance and, in severe cases, engine damage from overheating.
Is Your Spark's Coolant Sensor Failing?
A bad Engine Coolant Temperature (ECT) sensor can cause a surprising number of problems. Because the car's computer relies on this sensor for so much, a wrong signal can make the engine run poorly. You might notice one or more of these issues before the sensor fails completely.
Common Symptoms of a Bad ECT Sensor:
- Check Engine Light: This is often the first sign. A code like P0118 will be stored in the computer. 🎬 Watch: How to test and fix P0118 sensor codes
- Poor Fuel Economy: If the sensor tells the computer the engine is always cold, the computer will inject too much fuel, wasting gas.
- Engine Overheating: If the sensor fails to report that the engine is hot, the cooling fans may not turn on when needed, causing the engine to overheat.
- Black Smoke from Exhaust: A rich fuel mixture from a bad sensor reading can result in unburnt fuel burning in the exhaust, creating black smoke.
- Rough Idling or Hard Starting: The wrong fuel and air mixture can make the engine run rough or difficult to start, especially when cold.
Choosing the Right Aftermarket Sensor
When replacing the ECT sensor on your Spark, you have a few options. You don't have to buy the part from a Chevrolet dealer to get a quality component.
Brand Quality Tiers
Not all aftermarket brands are created equal. Here’s a breakdown of the brands available for your Spark:
- OEM Equivalent (Top Tier): ACDelco is General Motors' own parts brand. Choosing an ACDelco sensor is the closest you can get to the original part that came on your Spark from the factory. They are considered the GM-recommended replacement and are manufactured for the same performance and durability.
- Reputable Aftermarket (Mid Tier): Brands like Standard Ignition (SMP) and Four Seasons have a long history of making reliable replacement parts. Standard Ignition, for example, states their sensors are direct-fit OE replacements and undergo extensive testing. These are a solid choice if you want a quality part with a good warranty that costs a bit less than the OEM part.
- Value Brands (Economy Tier): Brands like Holstein, Global Parts, and True Tech offer a more budget-friendly option. Holstein notes their parts are made to match original form, fit, and function and come with a 3-year/36k mile warranty. While often perfectly functional, they may not have the same long-term durability or precise calibration as higher-tiered brands. They can be a good choice for older vehicles or those on a tight budget.
Pro Tip: For a critical sensor like the ECT, spending a few extra dollars on a top or mid-tier brand like ACDelco or Standard Ignition is often a good investment for peace of mind and long-term reliability.
Known Issues, Recalls, and Service Bulletins
My search for official recalls on the NHTSA website did not find any specific to the engine coolant temperature sensor for the 2011-2022 Chevrolet Spark. However, a Technical Service Bulletin (TSB), 20-NA-024, notes that some owners may feel their Spark is slow to warm up in very cold weather. This is considered a normal characteristic of the vehicle's energy-efficient engine and is not caused by a faulty sensor, provided no trouble codes are present. The bulletin advises against replacing the thermostat or sensor for this reason alone.
Cost of Replacing a Chevrolet Spark ECT Sensor
| Part Type | Average Cost |
|---|---|
| New Aftermarket Sensor | $16.94 - $29.66 |
| New OEM (ACDelco) Sensor | $16 - $32 |
| Shop Labor | $142 - $208 |
| Total Professional Replacement | $160 - $240 (Estimate) |
Note: Prices are estimates and can vary based on your location, the specific brand, and the repair shop's labor rates. The OEM part price is often competitive with aftermarket options.
Frequently Asked Questions (FAQ)
Where is the ECT sensor located on a Chevrolet Spark?
On the 1.2L engine (2011-2015), the engine coolant temperature sensor is located on the right side of the engine, near the front. It is typically 🎬 Watch: 1.2L Spark coolant sensor location and replacement guide screwed into the thermostat housing or a coolant passage on the cylinder head. You will see a small sensor with an electrical connector attached.
Can I replace the ECT sensor myself?
Yes, for most people with basic tools, this is a very feasible DIY job. The sensor is usually easy to access. The process involves disconnecting the battery, unplugging the electrical connector, and using a deep socket wrench to 🎬 See this step-by-step walkthrough for replacing the sensor unscrew the old sensor. Be prepared for a small amount of coolant to leak out when you remove the sensor. Make sure the engine is completely cool before starting this repair.
What happens if I don't replace a bad ECT sensor?
Continuing to drive with a bad sensor is not recommended. It can lead to persistently poor fuel economy, failed emissions tests, and rough engine performance. In a worst-case scenario, if the sensor fails to trigger the cooling fans, your engine could overheat, potentially causing severe and expensive damage like a warped cylinder head.
Is ACDelco the same as the original GM part?
Yes. ACDelco is the official parts brand for General Motors. When you buy a part labeled "ACDelco GM Original Equipment," you are getting the same part that was installed at the factory. They also offer a "Gold" (formerly "Professional") line, which are high-quality aftermarket parts that may not be the original equipment but are made to high standards.
Helpful Videos
Technical Specifications
OEM Part Numbers: 25186240 55591401 25181969 96476970
Typically a 2-pin sensor with a threaded body (M12x1.5 is a common size) that screws into a coolant passage.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chevrolet Spark:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Spark's Coolant Sensor Failing?
- Common Symptoms of a Bad ECT Sensor:
- Choosing the Right Aftermarket Sensor
- Brand Quality Tiers
- Known Issues, Recalls, and Service Bulletins
- Cost of Replacing a Chevrolet Spark ECT Sensor
- Frequently Asked Questions (FAQ)
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