Acura MDX Vehicle Speed Sensor Guide (2008-2020)
Having shifting problems or a faulty speedometer? Your MDX's vehicle speed sensor might be the culprit.
- A bad speed sensor will cause harsh shifting, an erratic speedometer, and a Check Engine Light.
- The MDX has separate input and output speed sensors; diagnose the correct one before buying.
- Replacement is a feasible DIY job for those comfortable working in tight spaces, requiring basic tools.
- Investing in a quality aftermarket brand like Delphi, Beck Arnley, or Standard Ignition is recommended for long-term reliability.
Is Your Acura MDX Vehicle Speed Sensor Failing?
A bad vehicle speed sensor in your 2008-2020 Acura MDX can cause frustrating and concerning driving issues. Because the sensor provides data to multiple systems, a failure can mimic more severe transmission problems. Recognizing the symptoms early can save you from a headache and a costly misdiagnosis.
Key Failure Symptoms
- Harsh or Erratic Shifting: The most common complaint. The transmission may slam into gear, hesitate between shifts, or refuse to shift into a higher gear.
- Flashing "D" Light: The "D" on your gear selector indicator may start blinking, which is Acura's way of signaling a transmission-related fault.
- Inaccurate or Dead Speedometer: The speedometer needle may jump around, read an incorrect speed, or stop working altogether.
- Check Engine Light: A faulty VSS will often trigger the Check Engine Light. Common trouble codes include P0717 (Input/Turbine Speed Sensor Circuit No Signal) and P0720 (Output Speed Sensor Circuit Malfunction).
- Cruise Control Not Working: The cruise control system needs accurate speed data to function. If the VSS fails, cruise control will be disabled.
Input vs. Output Sensors
Your MDX transmission has both an input and an output speed sensor. They look similar but have different functions and locations. The input sensor measures the speed of the transmission's input shaft, while the output sensor (the primary VSS) measures the output shaft speed. It's crucial to diagnose which sensor has failed 🎬 Watch how to test if your speed sensor has failed. before ordering a replacement. A P0717 code points to the input sensor, while a P0720 code points to the output sensor.
🎬 Step-by-step guide to replacing the output sensor and fixing P0720.Choosing the Right Aftermarket Speed Sensor
When replacing the vehicle speed sensor, you don't have to buy an expensive part from the Acura dealer. Quality aftermarket parts can offer the same performance for a fraction of the price. However, not all aftermarket brands are created equal. For a part that can be tricky to access, it's wise to choose a reputable brand to avoid doing the job twice.
Brand Quality Tiers
- OEM Supplier/Premium Aftermarket (e.g., Delphi, Beck Arnley): Brands like Delphi are often original equipment manufacturers for many car companies, meaning their parts are built to the same standards as the factory sensor. Beck Arnley specializes in sourcing parts that match the original equipment's form, fit, and function, making them a reliable choice.
- Trusted Aftermarket (e.g., Standard Ignition / SMP, Walker Products): Standard Motor Products (SMP) is a well-regarded manufacturer known for producing durable replacement parts that undergo extensive testing. Walker Products is another established brand offering a good balance of quality and value.
- Economy Brands (e.g., Vemo): While more budget-friendly, these brands may not have the same level of quality control or longevity as premium options. They can be a viable choice for a quick fix on a budget, but for the MDX, a higher-quality part is recommended to ensure long-term reliability.
Pro Tip: Given the labor involved in accessing the sensors on some MDX models, spending a little extra on a premium or trusted aftermarket brand is a smart investment to ensure you won't have to replace it again soon.
Cost of Replacing an Acura MDX Vehicle Speed Sensor
| Part Type | Typical Cost |
|---|---|
| New Aftermarket | $20 - $82 |
| New OEM (Acura) | $40 - $90 |
| Shop Labor | $95 - $200 |
Cost estimates are based on a range of online retailers and published labor rate data. Actual costs may vary.
Frequently Asked Questions
Can I drive my MDX with a bad speed sensor?
You can, but it's not recommended. Your speedometer will be unreliable, and the transmission will shift harshly and unpredictably. This is not only a safety risk but can also cause additional stress and wear on your transmission over time.
Where are the speed sensors located on the 2008-2020 MDX?
The input and output speed sensors are located on the outside of the automatic transmission housing. On the 2007-2013 models, they are accessible from underneath the vehicle after removing a splash shield. The input sensor is typically closer to the passenger side, 🎬 See how to replace the input speed sensor on your MDX. and the output sensor is closer to the driver's side. Access may require removing the air filter box and battery on some models to reach the connectors from above.
Is this a DIY job?
For a mechanically inclined owner, yes. The replacement involves removing a splash shield, disconnecting an electrical connector, and removing a single 10mm bolt. The main challenge can be reaching the sensor, which is in a tight space. Ensure you have a torque wrench to tighten the new sensor's bolt to the correct specification, which is typically around 8 ft-lbs.
Was there a recall for the Acura MDX speed sensor?
No, there have been no specific recalls issued by the NHTSA for the vehicle speed sensors on the 2008-2020 Acura MDX. However, Acura has issued Technical Service Bulletins (TSBs) for related issues like harsh or jerky shifting, which could be related to sensor inputs.
Helpful Videos
Technical Specifications
OEM Part Numbers: 28820-PWR-013 28810-RWE-003 28810-R90-003 28810-PCJ-014
Typically a 3-pin magnetic sensor held by a single 10mm bolt. The connector is often blue or black. Ensure the new part's connector angle matches the original.
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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