Engine Coolant Temperature Sensor Guide for 1995-1998 Dodge B3500
Fix poor fuel economy, rough idling, and incorrect temperature gauge readings by understanding this critical sensor.
- A failing ECT sensor directly impacts fuel economy and engine performance.
- Symptoms include a Check Engine Light (codes P0117, P0118), poor MPG, black smoke, and an erratic temp gauge.
- Replacement is a simple DIY task that takes less than an hour with basic tools.
- Do not use Teflon tape on the new sensor's threads, as it can interfere with the electrical ground needed for an accurate reading.
Is Your B3500's Coolant Sensor Failing?
When the ECT sensor starts to go bad, it sends incorrect information to the engine's computer, which can cause a wide range of problems. Because this sensor plays a key role in both engine performance and cooling, ignoring the symptoms can lead to bigger issues. You might notice one or more of the signs listed below if your sensor is on its way out.
Choosing the Right Aftermarket Sensor for Your Van
When replacing the ECT sensor, you have a choice between OEM (Mopar) and several aftermarket brands. For a critical sensor like this, brand quality matters. A cheap, poorly made sensor can provide inaccurate readings, leading to the same problems as a failed one.
Premium Aftermarket Brands: Brands like Delphi, NGK, and Standard Ignition's non-T-series line are well-regarded in the industry. They are known for using quality materials and adhering to strict manufacturing processes to ensure their sensors provide accurate readings and have a long service life. These are often the best choice for a reliable, long-term repair without paying the higher price for an OEM part.
Value-Oriented Brands: Brands such as Four Seasons and Walker Products offer a middle ground. They are generally more affordable than premium options and can be a good choice for budget-conscious repairs. While they may not have the same reputation for longevity as top-tier brands, they are a step up from the cheapest options available.
Economy Brands: The lowest-priced brands, including Skyward, True Tech, and Global Parts, present a gamble. While the low price is tempting, these sensors may have looser quality control, leading to a higher chance of inaccurate readings or premature failure. If you choose an economy brand, be aware that you might be replacing it again sooner than you'd like.
Cost of a New Engine Coolant Temperature Sensor (1995-1998 Dodge B3500)
| Category | Estimated Cost |
|---|---|
| New Aftermarket Part | $7.31 - $65.64 |
| New OEM (Mopar) Part | $40 - $75 |
| Shop Labor | $50 - $120 |
Installation Tip: To Seal or Not to Seal?
It is very important to avoid using Teflon tape on the threads of your new sensor. Some sensors ground themselves through the threads, and tape can interfere with this electrical connection, causing incorrect readings. Many new sensors come with a thread sealant already applied. If yours does not, use a small amount of an appropriate automotive-grade liquid thread sealant.
Frequently Asked Questions
Where is the ECT sensor located on my 1995-1998 B3500?
The engine coolant temperature sensor is typically threaded into the intake manifold, near the thermostat housing and behind the alternator. You will likely need to remove the air filter housing to get a clear view and access to it.
Can I replace the ECT sensor myself?
Yes, this is a very DIY-friendly job for most home mechanics with basic tools. The replacement can usually be done in under an hour. You will need a wrench or deep socket to remove the old sensor. Be prepared for a small amount of coolant to leak out when you remove the sensor; have the new sensor ready to install quickly to minimize loss.
What happens if I don't replace a bad sensor?
Ignoring a faulty ECT sensor is not recommended. It can lead to persistently poor fuel economy, increased engine emissions, and potential long-term damage from the engine running too rich. In some cases, it can also lead to overheating, which can cause severe engine damage.
Are there any recalls or TSBs for this sensor?
As of early 2026, there are no specific NHTSA safety recalls for the engine coolant temperature sensor on the 1995-1998 Dodge B3500. Recalls for this era of Dodge vans have typically focused on other components like airbags or fuel system parts.
Technical Specifications
OEM Part Numbers: 56027873
Two-wire, two-pin sensor that sends coolant temperature data to the ECU.
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.
- Dodge B3500: