GMC Yukon 1999-2007 Accelerator Pedal Sensor: Symptoms and Replacement
If your Yukon is in 'Reduced Engine Power' mode, this guide is for you.
- The 'Reduced Engine Power' message is the most common symptom of a failing accelerator pedal sensor on a 1999-2007 Yukon.
- This is an easy DIY replacement that takes less than 30 minutes with basic tools like a 10mm socket.
- Always verify if your Yukon has fixed or power-adjustable pedals before ordering the part to ensure correct fitment.
- While cheaper aftermarket brands are available, choosing a reputable brand like Standard Ignition (SMP) or NGK is recommended for this critical electronic part.
Is Your Yukon Suddenly Slow or Unresponsive?
A common and frustrating issue for 1999-2007 GMC Yukon owners is a sudden loss of power, often accompanied by a "Reduced Engine Power" message on the dash. This safety feature, known as "limp mode," is often triggered by a failing accelerator pedal sensor. While it's designed to protect the engine, it can leave you struggling to maintain speed in traffic. This article will help you understand the symptoms, choose the right aftermarket replacement part, and get your Yukon back to full power.
Symptoms of a Failing Accelerator Pedal Sensor
When the accelerator pedal sensor starts to fail, your Yukon will give you clear warning signs. Ignoring them can lead to being stranded. The most common issue is the truck entering Reduced Engine Power mode, which severely limits acceleration and speed. You might also experience:
- Check Engine Light: Often, the first sign is an illuminated check engine light. Common trouble codes include P2138, P2122, P2123, P2127, and P2128. 🎬 See how to fix the Reduced Engine Power warning light.
- Poor or No Acceleration: The pedal might feel unresponsive, or the truck may hesitate and lag before accelerating.
- Erratic Engine Behavior: The engine might surge, idle roughly, or even stall unexpectedly.
- Harsh Shifting: A bad sensor can send incorrect information to the transmission, causing rough or improper gear changes.
A Note on Related Issues
While the pedal sensor is a frequent culprit, similar symptoms can be caused by a dirty or failing throttle body, or even bad wiring and ground connections. It's common for mechanics to clean the throttle body or check grounds before replacing the pedal sensor.
🎬 Watch this video to learn how to clean your throttle body.Choosing the Right Aftermarket Sensor: Dorman vs. NGK vs. Standard Ignition
When replacing the accelerator pedal sensor, you don't have to pay dealership prices for an OEM part. Several reputable aftermarket brands offer quality replacements. For this specific part on GM trucks, owner experiences suggest that while aftermarket can be a good value, some ultra-cheap options can be faulty out of the box.
- Standard Ignition (SMP): Often considered a top-tier aftermarket brand, Standard Motor Products manufactures parts that are designed to be direct-fit OE replacements. They emphasize rigorous testing to ensure the output voltages match original specifications, which is critical for this sensor. This is often the most reliable choice for long-term performance.
- NGK: While famous for spark plugs, NGK also produces a range of high-quality sensors. As a reputable manufacturer, their pedal sensors are a solid choice, often trusted by professional mechanics.
- Dorman: Dorman is known for providing affordable and widely available parts. For many common repairs, they are a perfectly good solution. However, some professional technicians and DIYers report mixed results with complex electronic parts, sometimes preferring to install a used OEM part over a new Dorman. While a Dorman pedal sensor can fix the problem and is easy to install, it's often considered a budget-friendly option rather than a premium one.
Pro Tip: The accelerator pedal sensor is sold as a complete assembly with the pedal itself. It's a simple part to replace, typically held in by just two or three bolts and a single electrical connector. Many owners successfully perform this replacement at home in under 30 minutes.
🎬 Watch this step-by-step guide to replacing the pedal assembly.How Much Does a New Accelerator Pedal Sensor Cost?
The cost to fix this issue varies depending on whether you do it yourself or go to a shop. The part itself is affordable, but shop labor will add to the total.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Pedal Assembly | $38.95 - $97.99 |
| New OEM Pedal Assembly | $120 - $200+ |
| Shop Labor | $75 - $150 |
| DIY Total Cost | $38.95 - $97.99 |
| Estimated Shop Total | $150 - $350+ |
Frequently Asked Questions
Was there a recall on the 1999-2007 GMC Yukon accelerator pedal?
No, there were no specific recalls for the accelerator pedal sensor on the 1999-2007 GMC Yukon. There were some special coverage adjustments and TSBs for similar issues on other GM models and years, but not a formal recall for this specific vehicle range. Always check for recalls using your vehicle's VIN on the NHTSA website.
Do I need to perform a "relearn" procedure after installing a new pedal?
Generally, for this generation of Yukon, a specific computer relearn procedure is not required. Simply disconnecting the battery's negative terminal for about 15 minutes while you perform the replacement will reset the system. After reconnecting, the computer will adapt to the new sensor on its own. Some owners report letting the engine idle for a few minutes after installation helps the process.
Can I just replace the sensor and not the whole pedal assembly?
The sensor is technically a separate component on the pedal assembly, held on by small Torx screws. However, it is almost always sold as a complete pedal assembly. Attempting to replace only the sensor is not a standard repair, can be difficult, and offers little to no cost savings. It is highly recommended to replace the entire pedal assembly.
What's the difference between an adjustable and fixed pedal sensor?
Some higher-trim Yukon models came with power-adjustable pedals. The accelerator pedal assembly is different for trucks with this feature. Ensure you order the correct part for your vehicle's options. If you have a switch to move the pedals closer or further away, you have adjustable pedals.
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Technical Specifications
OEM Part Numbers: 15107594 15126388 15233288 25832864
The complete assembly includes the pedal and the integrated electronic sensor. It mounts to the firewall with two or three 10mm bolts. It is crucial to distinguish between parts for vehicles with and without the power-adjustable pedals option.
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.
- GMC Yukon:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Yukon Suddenly Slow or Unresponsive?
- Symptoms of a Failing Accelerator Pedal Sensor
- A Note on Related Issues
- Choosing the Right Aftermarket Sensor: Dorman vs. NGK vs. Standard Ignition
- How Much Does a New Accelerator Pedal Sensor Cost?
- Frequently Asked Questions
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