Coolant Temperature Sensor Guide for the 2002-2010 Dodge Ram 1500
If your Ram is running rough, getting poor gas mileage, or the temp gauge is acting up, this small sensor could be the problem.
- A bad coolant sensor directly impacts fuel economy and can cause overheating.
- Replacement is a simple DIY job on 3.7L/4.7L engines but more involved on the 5.7L HEMI due to the A/C compressor location.
- Common trouble codes associated with this failure are P0117 (Circuit Low) and P0118 (Circuit High).
- There are no active recalls or TSBs from Dodge or the NHTSA for this specific part on 2002-2010 models.
Is Your Ram's Coolant Temp Sensor Failing?
A faulty Engine Coolant Temperature (ECT) sensor can cause a surprising number of problems that may seem unrelated. Because the truck's computer relies on this sensor for so many calculations, a bad reading can throw everything off. Symptoms often get worse as the engine warms up.
🎬 Watch: Common signs and symptoms of a failing ECT sensor.Aftermarket vs. OEM Coolant Sensors
For a simple electronic part like a coolant temperature sensor, a quality aftermarket replacement offers excellent value. The original factory sensors can become brittle and fail over time, and some owners report that aftermarket sensors with brass threads are a durable upgrade over the original all-plastic design. Since this is a common failure item, a reliable aftermarket sensor provides a cost-effective and dependable repair for most owners. There is no need to pay a premium for a dealer part for this specific repair.
Cost of a New Coolant Temperature Sensor (2002-2010 Dodge Ram 1500)
| Part Type | Price Range |
|---|---|
| New Aftermarket Sensor | $20.53 - $26.20 |
| New OEM (Mopar) Sensor | $50 - $80 |
| Shop Labor Cost | $75 - $150 |
Frequently Asked Questions (FAQ)
Where is the coolant temperature sensor located on my Ram 1500?
The location depends on your engine. For 3.7L V6 & 4.7L V8 engines, the sensor is on the top front of the intake manifold, usually between the alternator and A/C compressor. 🎬 See this 4.7L sensor location and replacement walkthrough. For the 5.7L HEMI V8, it is located on the front of the engine block, hidden underneath the A/C compressor.
Is replacing the coolant sensor a DIY job?
Yes, this is a very feasible DIY job for most home mechanics. For the 3.7L and 4.7L engines, it's quite simple. For the 5.7L HEMI, it's more involved because you need to move the A/C compressor, but it is still manageable with basic tools.
🎬 Watch: Step-by-step guide for replacing the 5.7L HEMI sensor.What happens if I ignore a bad coolant sensor?
Ignoring it can lead to more serious problems. You will experience poor fuel economy, rough running, and could risk engine damage from overheating if the sensor fails to trigger the cooling fans. It can also cause your truck to fail an emissions test.
Are there any recalls for this sensor?
No. Searches of the NHTSA database show no specific recalls or technical service bulletins (TSBs) for the engine coolant temperature sensor on the 2002-2010 Dodge Ram 1500.
Helpful Videos
Technical Specifications
OEM Part Numbers: 56027873 5149077AB
Two-wire, thermistor-type sensor. Resistance varies inversely with temperature. Located in a coolant passage on the engine.
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 Ram 1500: