Buick Encore Engine Coolant Temperature Sensor: A 2013-2022 Replacement Guide
Understanding the signs of a failing coolant sensor and how to choose the right replacement for your Encore.
- Your Encore has two coolant sensors; diagnose which one is bad before buying a replacement.
- Symptoms range from bad gas mileage and a check engine light to engine overheating.
- For reliability, choose an OEM-equivalent brand like ACDelco or Delphi.
- Check for loose wiring at the sensor connector, as noted in a GM Technical Service Bulletin.
Is Your Buick Encore's Coolant Sensor Failing?
A bad engine coolant temperature sensor can cause a surprising number of problems. Because the sensor's reading affects so many engine functions, a false signal can lead to poor performance and even leave you stranded. Watch for these common symptoms.
Key Failure Symptoms:
- Check Engine Light: This is the most common sign. The ECM will store a trouble code like P0117, P0118, or P111E. 🎬 Watch this video for a deep dive into diagnosing these codes.
- Poor Fuel Economy: If the sensor wrongly tells the ECM the engine is cold, the computer will inject extra fuel, hurting your gas mileage.
- Engine Overheating: A sensor that fails to report a high temperature won't trigger the cooling fans, leading to a real overheating event.
- False Overheating Warnings: The sensor can also fail by sending a constant "hot" signal, causing the temperature gauge to spike and the fans to run continuously, even on a cold engine.
- Black Smoke from Exhaust: An overly rich fuel mixture from a bad sensor reading can result in unburnt fuel burning in the exhaust, creating black smoke.
- Rough Idle or Hard Starts: The wrong fuel mixture can make the engine run poorly, hesitate, or be difficult to start.
A Note on the Two Sensors in Your Encore
The 1.4L engine in the 2013-2022 Buick Encore actually has two coolant temperature sensors. One is located on the engine itself (or the thermostat housing), and the second is located on the passenger side of the radiator. They work together, and a significant difference in their readings can trigger a check engine light. It is common for the radiator-mounted sensor to fail. 🎬 See how to diagnose and swap the radiator-mounted sensor. Be sure to diagnose which sensor is faulty before ordering a replacement.
Known Issues for the 2013-2022 Buick Encore
No safety recalls have been issued by the NHTSA specifically for the engine coolant temperature sensor on the Buick Encore. However, a relevant Technical Service Bulletin (TSB) exists.
TSB 17-NA-390: For some 2018 models, GM issued a bulletin for the trouble code P111E ("Engine Coolant Temperature Sensor Not Plausible"). This could be caused by a poor electrical connection at the sensor or an issue with the ECM's software. The recommended fix is to inspect the sensor's connector for a tight fit and, if needed, have a dealer update the ECM calibration. While this applies to 2018 models, checking the connector is a good first step for any year.
Choosing the Right Aftermarket Sensor
When replacing the ECT sensor, you have a choice between OEM-equivalent parts and more budget-friendly aftermarket options. For a critical sensor like this, quality matters.
- Tier 1: OEM & OEM-Equivalent Brands (ACDelco, Delphi): ACDelco is General Motors' own parts brand, offering the same quality as the part your Encore came with from the factory. Delphi was the original manufacturer for many GM parts and is also considered an OEM-quality choice. For peace of mind and longevity, these are the top recommendations.
- Tier 2: Reputable Aftermarket Brands (Standard Ignition, NGK, Hella): Brands like Standard Motor Products (SMP) and NGK have a long history of producing reliable aftermarket electronic components that meet or exceed original specifications. They are a solid choice if an OEM part is not available.
- Tier 3: Value Brands (URO Parts, Facet, Four Seasons, etc.): These brands offer a direct-fit replacement at a lower cost. They can be a good option for budget-conscious repairs, but may not offer the same long-term durability as higher-tier brands.
| Part Type | Price Range |
|---|---|
| New Aftermarket | $12.32 - $48.93 |
| New OEM (GM Genuine / ACDelco) | $40 - $75 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions
Where is the coolant temperature sensor on a Buick Encore?
There are two. The most commonly replaced one is on the passenger side of the radiator, accessible by removing the plastic air intake snorkel. The second sensor is located on the engine's thermostat housing/water outlet.
🎬 Watch a step-by-step walkthrough for replacing the engine-mounted sensor.Can I replace the coolant temperature sensor myself?
Yes, this is a DIY-friendly repair for most home mechanics. The radiator sensor is held in by a simple clip. You can swap it quickly to minimize coolant loss or partially drain the system for a cleaner job. The job typically takes less than an hour.
What happens if I don't replace a bad coolant sensor?
Ignoring a bad sensor can lead to serious issues. You will experience poor fuel economy, failed emissions tests, and rough running. Most critically, you risk the engine overheating without warning, which can cause catastrophic damage like a warped cylinder head.
Is ACDelco the same as the original GM part?
Yes. ACDelco is the official parts division of General Motors. An ACDelco GM Original Equipment part is the same as the one installed at the factory. Their "Professional" line is their premium aftermarket offering, also considered a high-quality replacement.
Helpful Videos
Technical Specifications
OEM Part Numbers: 55591401 55353807 12641073 213-4514 213-4688
Typically a 2-pin thermistor sensor. Note that the radiator-mounted and engine-mounted sensors are different parts and are not interchangeable.
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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.
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