Jeep Grand Cherokee Engine Coolant Temperature Sensor Guide (2014-2024)
Having temperature gauge issues or a check engine light on your Grand Cherokee? It could be this small, but critical, sensor.
- A bad ECT sensor can cause a check engine light, poor fuel economy, an erratic temp gauge, and overheating.
- For the 3.6L V6, the sensor is on the back of the driver's side cylinder head; for V8s, it's on the water pump.
- Check for TSB 07-005-23 if you have a 2023 model with a coolant leak near the sensor.
- For best results, choose an OEM (Mopar) or premium aftermarket brand like Delphi or NGK.
Is a Bad Coolant Temp Sensor Causing Your Jeep's Problems?
A faulty Engine Coolant Temperature (ECT) sensor on a 2014-2024 Jeep Grand Cherokee can cause a surprising number of issues. Because the engine's computer relies on this sensor for so much information, a bad signal can lead to everything from poor performance to a no-start condition. The most common sign is a check engine light with codes like P0117, P0118, or P0128. You might also notice your temperature gauge on the dashboard behaving erratically—swinging from cold to hot, or not moving at all. Other symptoms include reduced fuel economy, black smoke from the exhaust, a rough idle, or difficulty starting the engine, especially when it's warm.
🎬 Watch this video to learn more about common ECT sensor symptoms.Don't Mistake It for a Thermostat Issue
A bad thermostat and a bad ECT sensor can have similar symptoms, like an overheating engine or a gauge that reads incorrectly. A key difference is that a thermostat is a mechanical part that can get stuck open or closed, while the sensor is an electronic part that fails electrically. Often, a thermostat stuck open will cause a P0128 code (Coolant Temperature Below Thermostat Regulating Temperature), while sensor-specific codes like P0117 (low circuit) or P0118 (high circuit) point directly to the sensor or its wiring.
Choosing the Right Aftermarket Sensor
When it comes to sensors for your Grand Cherokee, you have options ranging from the original factory part to various aftermarket brands. For a critical sensor like this, quality matters.
- Tier 1: OEM & Premium Aftermarket (Mopar, Delphi, NGK): Mopar is the original equipment manufacturer (OEM) part your Jeep came with. It guarantees perfect fit and function. Delphi and NGK are often original equipment suppliers, meaning they make the parts for Mopar in many cases. Choosing one of these brands is the safest bet for reliability and avoiding repeat repairs.
- Tier 2: Quality Aftermarket (Standard Ignition, Dorman, Beck Arnley, Walker): These brands are well-known in the aftermarket and offer a good balance of price and quality. They engineer parts to meet or exceed OEM specifications and are a reliable choice for most owners. Dorman is known for providing solutions to common OEM problems, while Beck Arnley focuses on sourcing parts that match the original's form and fit for specific applications. 🎬 See why Beck/Arnley sensors are a reliable choice for your Jeep.
- Tier 3: Economy Brands (Crown Automotive, Holstein, Omix-Ada, Global Parts): These brands offer the most budget-friendly options. While they can be a good value, their quality can sometimes be inconsistent. For a sensor that is relatively inexpensive and easy to replace, saving a few extra dollars with a budget brand might be a risk if it fails prematurely.
Known Issues for 2014-2024 Grand Cherokee
While there are no widespread recalls for the ECT sensor itself on this generation of Grand Cherokee, a Technical Service Bulletin (TSB 07-005-23) was issued for some 2023 models. This TSB addresses a potential coolant leak from a broken lock ring on the ECT sensor for vehicles built within a specific two-week period in late 2022. The repair involves inspecting the sensor and replacing it if it can be rotated easily, which indicates a broken lock ring. Owners of other years frequently discuss symptoms like fluctuating temperature gauges in online forums, which can be caused by a failing sensor, a bad thermostat, or air in the cooling system.
Pro Tip: Check Your Engine Code
Before buying a new sensor, get your check engine light codes read. An auto parts store can do this for free. Codes like P0117 or P0118 strongly suggest a sensor or wiring issue, while a P0128 code often points to a faulty thermostat. This can save you from replacing the wrong part.
Cost of Replacing the Engine Coolant Temperature Sensor
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $45 - $75 |
| New Aftermarket | $15 - $60 |
| Shop Labor | $90 - $150 |
Frequently Asked Questions
Where is the ECT sensor located on my Grand Cherokee?
The location depends on your engine. For the 3.6L V6 engine, the sensor is located on the rear of the driver's side cylinder head, which can be tricky to access. For the 5.7L and 6.4L HEMI V8 engines, it is much easier to find, located on the front of the engine on top of the water pump housing.
Can I drive my Jeep with a bad coolant temperature sensor?
It is not recommended. A bad sensor can cause the engine to run too rich, damaging the catalytic converter, or it could fail to activate the cooling fans, leading to severe engine overheating and damage. If the temperature gauge is reading erratically or in the red, it's best to stop driving and have it inspected.
Is this a difficult DIY job?
For most people with basic tools, this is a manageable job, especially on the V8 engines where the sensor is easily accessible. The main steps are partially draining the coolant, disconnecting the electrical connector, unscrewing the old sensor, and installing the new one. The most critical step is to properly bleed the cooling system after the repair 🎬 Follow this step-by-step walkthrough for replacing your sensor and thermostat. to remove any air pockets, which can cause overheating and other issues.
Should I replace the thermostat at the same time?
If your Grand Cherokee has over 80,000 miles or if you're getting a P0128 code, it's a good idea to replace the thermostat and the sensor at the same time. They are both relatively inexpensive parts, and the thermostat is often replaced as preventative maintenance. Since you already have to drain some coolant for the sensor, doing both at once saves time and effort.
Helpful Videos
Technical Specifications
OEM Part Numbers: 5149077AB 68217702AD 68164627AA 5149096AB
2-pin connector, threaded brass body. Location varies by engine (3.6L V6 vs 5.7L/6.4L V8).
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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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