Chrysler Sebring Automatic Transmission Output Speed Sensor Guide (2001-2010)
Solve erratic shifting and speedometer problems in your 2001-2010 Chrysler Sebring by understanding the output speed sensor.
- A bad output speed sensor is a common cause of harsh shifting and a dead speedometer on the 2001-2010 Sebring.
- The most common trouble code is P0720; this code strongly points to the output sensor or its circuit.
- Replacement is a simple DIY job for many owners, requiring basic tools and about an hour.
- Before replacing the sensor, consider having the alternator tested, as a failing one can cause identical symptoms.
Is Your Sebring Shifting Hard or Is the Speedometer Dead?
A failing automatic transmission output speed sensor is a common problem on the 2001-2010 Chrysler Sebring that can cause confusing and alarming symptoms. Because this single sensor reports vehicle speed to the car's computer, its failure can mimic a catastrophic transmission failure. Understanding the specific signs of a bad output speed sensor can help you diagnose the problem correctly and avoid unnecessary, expensive repairs.
Symptoms of a Failing Output Speed Sensor
When the output speed sensor begins to fail, it sends erratic or no signal to the vehicle's computer, resulting in several distinct symptoms. Paying attention to these signs is the first step in diagnosing the issue.
- Harsh or Erratic Shifting: The most common symptom is the transmission shifting hard, delaying shifts, or getting stuck in one gear (often called "limp mode"). This happens because the computer can't determine the correct shift points.
- Inaccurate or Dead Speedometer: The speedometer may jump around wildly, show a speed that is clearly wrong, or stop working altogether.
- Check Engine Light: A faulty sensor will trigger the Check Engine Light and store a diagnostic trouble code. The most common code for this issue is P0720 (Output Speed Sensor Circuit Malfunction).
- Cruise Control Inoperative: The cruise control system relies on a steady speed signal from the OSS. If the signal is lost or erratic, the cruise control will not engage.
Could It Be the Alternator?
In some Chrysler Sebring models, a failing alternator can create electrical "noise" or interference that disrupts the speed sensor's signal, causing identical symptoms. Before replacing the sensor, it's a wise diagnostic step to have your alternator and battery tested, especially if you've also noticed dimming lights or a whining noise from the engine bay.
Choosing the Right Aftermarket Sensor for Your Sebring
When replacing the output speed sensor, you don't have to buy an expensive OEM part from the dealer. Several reputable aftermarket brands offer quality replacements at a lower cost. They generally fall into a few tiers.
- Premium Aftermarket (NGK/NTK, Standard Ignition): Brands like NTK (the sensor division of NGK) and Standard Motor Products (SMP) are well-regarded in the industry. They often have experience as Original Equipment suppliers and manufacture their sensors to meet or exceed OE specifications, undergoing rigorous testing. These are excellent choices for reliability and longevity.
- OE-Matching Quality (Beck Arnley): Beck Arnley specializes in parts for foreign and domestic vehicles that match OE form, fit, and function. They source high-quality components to provide a dependable alternative to the dealer part.
- Economy Options (ATP, Pioneer Cable, Skyward, True Tech): These brands provide a functional replacement at the lowest price point. While they can solve the immediate problem, they may not have the same long-term durability or undergo the same level of testing as premium brands. They are a viable option for budget-conscious repairs.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $55 - $80 |
| New Aftermarket | $13.98 - $101.76 |
| Shop Labor | $60 - $125 |
DIY Replacement is Possible
Replacing this sensor is a job most home mechanics can handle. Depending on the year and engine, it's located on the outside of the transmission and can be accessed either from the top after removing the air filter box or from the side after removing the driver's side wheel well liner. It typically requires only a 1-inch or 25mm wrench or socket.
Frequently Asked Questions (FAQ)
What is the difference between the input and output speed sensor?
Your Sebring has two main transmission speed sensors. The input sensor measures the speed of the transmission's input shaft (how fast it's being spun by the engine), while the output sensor measures the output shaft's speed (how fast power is being sent to the wheels). The computer compares these two speeds to ensure the transmission is in the correct gear and not slipping. The output sensor is the one responsible for the speedometer reading.
Can I just replace the output sensor if I get a P0720 code?
Yes, a P0720 code specifically points to a fault in the output speed sensor circuit. While the issue could be in the wiring, the sensor itself is the most common point of failure. Given the low cost of the part, replacing the sensor is the most common and effective repair.
Is it safe to drive with a bad output speed sensor?
It is not recommended. While the car may still move, you will have an inoperable speedometer and the transmission may shift harshly and unpredictably. This can be a safety hazard in traffic, and driving the vehicle for an extended period in this condition can put extra strain on the transmission.
How do I know if it's the sensor or the wiring?
While a faulty sensor is more common, a visual inspection of the wiring harness and connector leading to the sensor is a good idea. Look for any obvious damage, corrosion on the pins, or loose connections. If the wiring looks good, the sensor is the most likely culprit. In rare cases, a bad alternator can also cause the same symptoms due to electrical interference.
Technical Specifications
OEM Part Numbers: 4800879 04800879 4800879AB
The output speed sensor for the 2001-2010 Chrysler Sebring is a two-wire magnetic pickup sensor that threads directly into the transmission case. It is sealed with an O-ring to prevent fluid leaks. Depending on the model year and transmission (41TE or 62TE), the sensor may be secured with a 1-inch or 25mm hex body.
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.
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