Guide to the 1994-2001 Dodge Caravan Transmission Output Speed Sensor
If your Caravan's transmission is acting up, this common failure part is the likely reason.
- A failed output speed sensor is the most common cause of 'limp mode' in 1994-2001 Caravans.
- Symptoms include being stuck in 2nd gear, an erratic speedometer, and a P0720 check engine code.
- Replacement is simple, requires basic tools, and can be done in under an hour by a DIYer.
- While cheaper aftermarket sensors exist, choosing a reputable brand like Standard (SMP) or NGK (NTK) is recommended for reliability on these transmissions.
Is Your Caravan Stuck in Second Gear?
A very common problem for the 1994-2001 Dodge Caravan is the transmission suddenly going into "limp mode." This usually means it gets stuck in second gear and won't shift up or down. 🎬 Watch: This video explains how to fix limp mode issues. This is a safety feature designed to protect the transmission from further damage when it detects a major problem. In most cases, the problem is a failed Automatic Transmission Output Shaft Speed Sensor. Other symptoms include an erratic or non-working speedometer, harsh shifting, and the check engine light coming on.
Common Failure Symptoms
A bad output speed sensor can make your van difficult and unsafe to drive. Here are the most common signs to watch for:
- Transmission Stuck in "Limp Mode": The van will only operate in second gear, with high RPMs at moderate speeds. This is the most reported issue.
- Erratic or Dead Speedometer: The speedometer needle may jump around randomly or not move at all.
- Harsh or Delayed Shifting: The transmission may slam into gear or hesitate before shifting.
- Check Engine Light: A failed sensor will trigger the check engine light and store a trouble code. The most common code is P0720 (Output Speed Sensor Circuit Malfunction). 🎬 See this guide on diagnosing and fixing the P0720 code. Often, a generic P0700 (Transmission Control System Malfunction) will also appear, which simply points to a transmission-related fault.
Don't Mistake it for a Bad Transmission
Many owners fear their transmission has completely failed when these symptoms appear. However, replacing this simple and inexpensive sensor often solves the problem completely. Always check for a P0720 code before considering a costly transmission repair.
Choosing the Right Aftermarket Sensor
For many parts, aftermarket options are a great way to save money. However, with electronic sensors on Chrysler-built transmissions of this era, quality can vary. Some owners report that very cheap, unbranded aftermarket sensors can fail quickly. Brands like Standard Ignition (SMP) and NGK (NTK) are generally considered higher-quality aftermarket choices that offer a good balance of price and reliability. Cheaper brands may work, but for a critical sensor like this, spending a few extra dollars on a reputable brand can prevent you from having to do the job twice.
Input vs. Output Sensor
Your Caravan has both an input and an output speed sensor. They often look identical and are located near each other on the transmission. The P0720 code specifically points to the output sensor. Double-check you are ordering and replacing the correct part.
Cost of Replacing the Sensor
This is a relatively inexpensive repair, especially if you do it yourself. The part itself is affordable, and labor is minimal.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $13.98 - $57.47 |
| New OEM Part (Mopar) | $45 - $90 |
| Shop Labor | $50 - $120 |
| Total (DIY) | $13.98 - $57.47 |
| Total (Shop) | $65 - $210 |
Frequently Asked Questions
Where is the output speed sensor located on a 1994-2001 Caravan?
The output speed sensor is located on the outside of the transmission case. On most models, you can access it by looking down past the battery and transmission cooler lines. On some, it's easier to access from the driver's side wheel well. It is a plastic sensor held in by one bolt, with an electrical connector attached.
Is this a difficult part to replace myself?
No, this is a great DIY job for beginners. It typically requires only basic hand tools, like a socket set. The process involves disconnecting the battery, unplugging the sensor's electrical connector, removing one bolt, and swapping the old sensor for the new one. 🎬 Watch: A step-by-step walkthrough of the sensor replacement process. The most difficult part is often just reaching the sensor in a tight space.
Do I need to drain the transmission fluid?
No. The sensor is located above the fluid level. A small amount of transmission fluid might drip out when you remove the old sensor, so it's a good idea to have a rag ready, but you do not need to drain the transmission.
Will a bad output speed sensor cause other codes?
Yes. A faulty output speed sensor can cause the computer to log incorrect gear ratio codes, such as P0731 or P0732, because the computer sees a mismatch between engine speed and the (incorrect) output speed it's being told. Replacing the faulty sensor will usually resolve these other codes as well.
Helpful Videos
Technical Specifications
OEM Part Numbers: 04800879 4800879 4800879AB
2-terminal plastic body sensor, typically requires a 1-inch socket or wrench for removal.
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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