Accelerator Pedal Sensor for the 2003-2007 Acura MDX
Experiencing hesitation, poor acceleration, or limp mode in your MDX? A faulty accelerator pedal sensor could be the cause.
- A failing sensor is the most common cause of trouble code P2138 on the 2003-2007 MDX.
- Symptoms often include sudden hesitation, sluggish acceleration, and the vehicle entering 'limp mode'.
- Replacement is a simple DIY job for most owners, requiring basic tools and less than an hour.
- The sensor is located on the engine bay firewall, not directly on the pedal inside the cabin.
Symptoms of a Failing Accelerator Pedal Sensor in a 2003-2007 Acura MDX
When the accelerator pedal sensor begins to fail, your MDX's computer can receive confusing or incorrect signals. This often leads to noticeable driving problems. Many owners report a gradual decline in performance 🎬 Watch a detailed breakdown of common pedal sensor failure symptoms. before the sensor fails completely.
- Hesitation or Lag: You press the gas pedal, but there's a delay before the vehicle accelerates. This can feel like the engine is stumbling or not responding smoothly.
- Limp Mode: This is a common and serious symptom. The vehicle's computer will intentionally limit engine power and speed to prevent potential damage when it detects a critical sensor error. Your MDX will feel very sluggish, may not shift gears properly, and will not accelerate past a certain low speed.
- Check Engine Light and Other Warnings: A failing pedal sensor will almost always trigger a Check Engine Light. You may also see other warnings on your dashboard, such as the VSA (Vehicle Stability Assist) light. The most common trouble code associated with this failure is P2138, which indicates a mismatch in the voltage signals from the sensor's 🎬 See how replacing the sensor fixes hesitation and P2138 codes. two internal circuits.
- No Throttle Response: In a complete failure, pressing the gas pedal does nothing at all. The engine may start and idle, but it will not rev up when you press the accelerator.
Driving with a Faulty Sensor
While you might be able to drive the vehicle in "limp mode," it is not recommended. Throttle response will be unpredictable and severely limited, which can be dangerous in traffic. It is best to have the vehicle serviced as soon as possible.
Choosing a New Aftermarket Accelerator Pedal Sensor
For the 2003-2007 MDX, the accelerator pedal sensor is a standalone part located on the firewall in the engine bay, connected to the accelerator pedal by a cable. When shopping for a replacement, you will find options from the Original Equipment Manufacturer (OEM) and aftermarket brands like Dorman and Standard Ignition (also known as Standard Motor Products or SMP).
OEM vs. Aftermarket Quality
For critical electronic components like the accelerator pedal sensor, many mechanics and owners prefer to use the genuine OEM part from Acura/Honda. However, quality aftermarket parts can offer a reliable repair at a lower cost. Forum discussions show mixed experiences with Dorman parts in general, with some users reporting premature failures on other applications. Standard Motor Products (SMP) is often considered a reputable aftermarket brand, with some of their parts being re-boxed OEM components. Given the importance of this sensor, choosing a well-regarded aftermarket brand is key if you decide against OEM.
A Note on Part Numbers
The common OEM part number for this sensor is 37971-RCA-A01. You may also see 37971-RDJ-A01 or 37971-RBB-003, which are often compatible. Always verify the fitment for your specific vehicle before purchasing.
Replacement Cost and Labor
Replacing the accelerator pedal sensor on a 2003-2007 MDX is a straightforward job that many DIYers can complete at home with basic tools. The sensor is located in the engine bay and is held on by a few bolts.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Sensor (Dorman, Standard Ignition) | $151 - $156 |
| New OEM Sensor (Acura/Honda) | $225 - $340 |
| Shop Labor | $100 - $150 |
| Total Professional Replacement (Aftermarket) | $251 - $306 |
Frequently Asked Questions (FAQ)
Is this a difficult part to replace myself?
No, this is considered an easy DIY repair. The job requires basic hand tools like a 10mm socket and a 12mm wrench. The process involves removing a cover, disconnecting the throttle cable and electrical connector, and unbolting the sensor assembly from 🎬 Follow this step-by-step guide to locate and replace the sensor. the firewall. The entire job can typically be done in under an hour.
Are there any recalls for the 2003-2007 MDX accelerator pedal sensor?
No, a search of the National Highway Traffic Safety Administration (NHTSA) database shows no recalls specifically for the accelerator pedal sensor on the 2003-2007 Acura MDX. There were several prominent recalls for Takata airbags affecting these model years.
Is there a Technical Service Bulletin (TSB) for this issue?
There is no specific TSB for a widespread failure of the accelerator pedal sensor itself on the 2003-2007 MDX. However, TSB 04-035 was issued for 2001-2002 models for a pedal that feels like it "pops" when first pressed, which is a different issue. The trouble code P2138 is a well-documented issue for this sensor failure across many Honda and Acura vehicles.
Will a new sensor fix my MDX's hesitation problem?
If the hesitation is accompanied by a P2138 trouble code, replacing the sensor is the correct fix and has solved the issue for many owners. However, hesitation can also be caused by other issues like a dirty throttle body, transmission problems, or fuel system issues. A proper diagnosis is always recommended.
Helpful Videos
Technical Specifications
OEM Part Numbers: 37971-RCA-A01 37971-RDJ-A01 37971-RBB-003
Mounts to the engine bay firewall. Connects to the throttle pedal via a cable and to the ECU via an electrical harness. Contains two separate sensor circuits for redundancy.
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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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