Ram 5500 (2011-2018) Engine Coolant Temperature Sensor Replacement Guide
Keep your 6.7L Cummins running right by understanding the signs of a failing engine coolant temperature sensor and how to choose the best replacement.
- A failing ECT sensor on your Ram 5500 can cause overheating, poor fuel economy, and an illuminated check engine light.
- Replacement is a manageable DIY task, typically taking less than an hour.
- While economy brands are available, choosing a top-tier aftermarket brand like Delphi, NGK, or Standard (SMP) can prevent premature failure.
- Always verify the new part matches the old one, as incorrect parts (for gas engines, wrong connector) are a common issue.
Symptoms of a Failing ECT Sensor on a Ram 5500
A bad engine coolant temperature sensor can cause a range of problems, from minor annoyances to issues that could lead to engine damage. Because the sensor's reading affects so many engine functions, failure symptoms can sometimes be confusing.
🎬 Watch this video to learn more about common ECT failure symptoms.Overheating Engine: If the sensor fails and sends a false "cold" signal, the engine's cooling fans may not turn on when needed, leading to the engine overheating. Conversely, a false "hot" signal can make the fans run constantly. An overheating engine is a serious issue that can cause severe damage.
Check Engine Light: A faulty ECT sensor will often trigger a Check Engine Light. The computer stores a trouble code when the sensor's signal is out of the expected range, indicating a short, open, or performance issue.
Poor Fuel Economy: The ECM relies on the coolant temperature to determine the right air-fuel mixture. An incorrect reading can cause the engine to run rich, as if it were constantly cold, which wastes fuel.
Erratic Temperature Gauge: The temperature gauge on your dashboard might behave strangely. It could spike to hot, drop to cold, or not move at all, even when the engine is at normal operating temperature.
Choosing the Right Aftermarket ECT Sensor
When replacing the ECT sensor on your Ram 5500, you have several aftermarket options. While an OEM Cummins part is a reliable choice, many aftermarket brands offer quality parts that meet or exceed OEM specifications. However, forum discussions sometimes mention that cheaper sensors can be dead on arrival or fail prematurely, requiring you to do the job twice.
Brand Tiers for Ram 5500 ECT Sensors
- Top Tier (OEM Equivalents & Premium Aftermarket): Brands like Delphi and NGK/NTK are often original equipment suppliers to many automakers and have a strong reputation for quality and accuracy. Standard Motor Products (SMP) is another well-regarded brand in the aftermarket, known for making durable sensors that often exceed OEM quality.
- Mid-Tier (Reliable Aftermarket): Brands like Dorman and Beck Arnley offer direct-fit replacement parts that are widely available and often come with a good warranty. They provide a balance of quality and value, making them a popular choice for many repairs.
- Economy Tier: This category includes various other brands that focus on being the most affordable option. While they can work, some owners report higher failure rates or fitment issues. If you choose an economy part, be prepared for the possibility of it not lasting as long as a premium brand.
Pro Tip: When replacing the sensor, it's a good idea to compare the new part to the old one before installation. Check that the threads and electrical connector match perfectly to avoid issues. Some users have reported receiving parts for a gas engine by mistake or having connectors that don't fit properly.
Cost of Replacing a Ram 5500 ECT Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $21.73 - $61.44 |
| New OEM (Mopar/Cummins) Sensor | $30 - $115 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions (FAQ)
Where is the ECT sensor located on a 2011-2018 Ram 5500?
On the 6.7L Cummins engine, the engine coolant temperature sensor is located on the passenger side of the engine, often below the EGR tube and behind a steel plate. Accessing it may require removing this plate.
🎬 Watch a visual overview of sensor locations on the 6.7L Cummins.Can I replace the ECT sensor myself?
Yes, this is a DIY-friendly job for most people with basic tools. The process involves partially draining the coolant, unplugging the old sensor, unscrewing it, and installing the new one. The most difficult part is often accessing the sensor's location. The estimated time is under one hour.
🎬 See a step-by-step guide on replacing the sensor yourself.Do I need to drain all the coolant to replace the sensor?
You don't need to drain all the coolant. However, since the sensor is located below the coolant level in the engine, you should drain some coolant from the radiator's petcock to prevent a large spill when you remove the old sensor. Having a drain pan ready is essential.
Are there any recalls for the ECT sensor on the Ram 5500?
There are no specific recalls for the engine coolant temperature sensor itself. There was a recall (NHTSA 17V-562) for the water pump on some 2013-2017 Ram trucks with the 6.7L engine, which could fail and cause an engine fire, but this did not involve the sensor directly. Always check for the latest recalls using your vehicle's VIN on the NHTSA website.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4954905 5149077AB 5011852AB 5114413AA 3096153 3865346 4088750 4088751
The sensor for the 6.7L Cummins is a 2-pin, threaded sensor that reports temperature to the ECM via changing electrical resistance.
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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.
- Ram 5500: