Ram 1500 Engine Coolant Temperature Sensor: A Guide for 2011-2019 Owners
Fix check engine lights, poor fuel economy, and incorrect temperature readings on your Ram 1500.
- A bad ECT sensor can cause a check engine light, poor fuel economy, overheating, and a faulty temperature gauge.
- For the 5.7L Hemi, the sensor is easy to access; for the 3.6L V6, access is through the driver's side wheel well.
- Code P0128 is more often caused by a stuck thermostat than a bad sensor.
- High-quality aftermarket brands like Delphi and Standard Ignition are reliable alternatives to the OEM Mopar part.
Is Your Ram 1500's Coolant Temp Sensor Failing?
A bad Engine Coolant Temperature (ECT) sensor can cause a surprising number of problems. Because the truck's computer relies on this sensor's data, a false reading can make the engine behave as if it's always cold or constantly overheating. This can lead to a check engine light, poor performance, and even prevent your truck from passing an emissions test.
Common Failure Symptoms
- Check Engine Light: The most common sign. Often with codes P0117, P0118, or P0128.
- Poor Fuel Economy: If the sensor sends a false 'cold' signal, the computer will enrich the fuel mixture, wasting gas.
- Black Smoke from Exhaust: A very rich fuel mixture can lead to unburnt fuel burning in the exhaust pipe.
- Engine Overheating: A sensor that fails to report a hot engine won't trigger the cooling fans, causing temperatures to rise.
- Inaccurate Temperature Gauge: The gauge on your dash may read empty, fluctuate wildly, or never move from cold.
- Rough Idle or Stalling: Incorrect fuel and timing adjustments from a bad reading can make the engine run poorly.
Choosing the Right Aftermarket Sensor
For the 2011-2019 Ram 1500, you don't have to buy the Mopar part to get a quality sensor. Many aftermarket brands meet or exceed the original specifications, and some even offer upgrades like brass threads instead of the original plastic. Here’s how the brands generally stack up.
Tier 1: OEM & Premium Aftermarket
These brands are either the original equipment manufacturer or are known for producing parts that are equal to or better than OEM quality. They are a reliable choice for a direct, trouble-free replacement.
- Mopar: The factory part. It's the benchmark for fit and function.
- Delphi: A well-respected OEM supplier. They emphasize meeting strict OE standards in their aftermarket parts.
- NGK / NTK: A top-tier manufacturer known globally for high-quality engine management sensors.
- Standard Ignition (SMP): A long-standing, trusted name in the aftermarket for reliable electronic components.
Tier 2: Quality Aftermarket & Specialists
These brands offer a great balance of quality and value. They are a solid choice for most repairs.
- Beck Arnley: Often sources parts from various OEM manufacturers and re-packages them.
- Crown Automotive: Specializes in Jeep and Chrysler-family vehicles, offering a good alternative to Mopar.
- Holstein / Walker Products: Dependable aftermarket brands with a reputation for quality control.
Tier 3: Value Options
These brands provide a functional replacement at a lower cost. They are suitable for budget-conscious repairs.
- Dorman: Known for making a huge range of parts. A viable and affordable option for a common sensor like this.
- Global Parts / Motorad: Standard-grade brands that will get the job done.
Known Issues, Recalls, and TSBs
There are no major recalls specifically for the engine coolant temperature sensor on the 2011-2019 Ram 1500 gasoline engines. However, two related cooling system recalls are worth noting:
- NHTSA Recall 13V177000: This affected some 2013 Ram 1500s with the 3.6L V6. A faulty coolant bypass valve could stick, preventing the heater and defroster from working. This was not a sensor issue, but the symptoms could be confusing.
- NHTSA Recall 19V-757: This applied to 2014-2019 Ram 1500s with the 3.0L EcoDiesel engine. A cracking EGR cooler could cause coolant loss and, in rare cases, a risk of fire. This does not apply to gasoline engines.
Cost to Replace a Ram 1500 Coolant Temp Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $15 - $77 |
| New OEM (Mopar) Part | $50 - $100 |
| Shop Labor | $75 - $225 |
Labor costs vary significantly based on which engine you have. The 5.7L Hemi is much easier and cheaper than the 3.6L Pentastar for this specific job.
Frequently Asked Questions (FAQ)
Where is the ECT sensor located on my Ram 1500?
It depends on your engine.
On the 5.7L Hemi, it's on the front of the engine, right below the throttle body, threaded into the water pump/thermostat housing area. It's relatively easy to see and reach.
On the 3.6L Pentastar, it's in a much tougher spot. It is located on the driver's side of the engine block, toward the rear. The easiest way to access it is by removing the driver's side front wheel and the plastic fender liner.
Can I replace the sensor myself?
Yes, this is a DIY-friendly job for most home mechanics. For the 5.7L Hemi, it's very straightforward and may only take 20-30 minutes. For the 3.6L V6, it's more involved because you have to remove the wheel and fender liner, but it is still manageable with basic tools.
What tools do I need?
You will need a basic socket set (a deep socket, often 19mm or 3/4", is needed for the sensor), a flathead screwdriver to release clips, and possibly pliers. For the 3.6L engine, you'll also need tools to safely remove the wheel. A drain pan is recommended to catch any spilled coolant.
My truck threw a P0128 code. Is it the sensor or the thermostat?
Code P0128 means the engine isn't warming up as fast as the computer expects. The most common cause for this code is a thermostat that is stuck open, causing the engine to run too cool. While a faulty sensor *can* cause this code, it's more likely to be the thermostat. If your temperature gauge never reaches its normal operating position (usually just under the halfway mark), a stuck-open thermostat is the prime suspect.
Helpful Videos
Technical Specifications
OEM Part Numbers: 5149077AB 68045803AA 05149077AA 5149096AB
2-pin, threaded sensor. Typically requires a 19mm or 3/4" deep socket for removal/installation.
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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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- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Ram 1500's Coolant Temp Sensor Failing?
- Common Failure Symptoms
- Choosing the Right Aftermarket Sensor
- Tier 1: OEM & Premium Aftermarket
- Tier 2: Quality Aftermarket & Specialists
- Tier 3: Value Options
- Known Issues, Recalls, and TSBs
- Cost to Replace a Ram 1500 Coolant Temp Sensor
- Frequently Asked Questions (FAQ)
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