Accelerator Pedal Sensor for 2007-2013 GMC Yukon XL 2500: A Complete Guide
If your Yukon XL 2500 is stuck in 'Reduced Engine Power' mode, the accelerator pedal sensor is a likely culprit.
- Before replacing the pedal, check for water leaks in the driver's side kick panel wiring harness, as per TSB 07-06-04-019F, which causes identical symptoms.
- The most common symptom is the 'Reduced Engine Power' message combined with a P2138 trouble code.
- Replacement is a simple DIY job, requiring only basic tools and about 30 minutes.
- A new aftermarket part from a brand like Standard Ignition is a reliable and cost-effective alternative to a more expensive OEM part.
Is Your Yukon XL 2500's Accelerator Pedal Sensor Failing?
A bad accelerator pedal sensor can cause very noticeable and frustrating problems. The most common issue on this generation of GM trucks is a "Reduced Engine Power" message on the dashboard. This is a safety feature, often called 'limp mode', where the truck's computer limits speed and acceleration to prevent an accident when it gets confusing signals from the pedal. You may also experience a Check Engine Light, a rough or high idle, hesitation when you accelerate, or the engine may not respond at all when you press the gas pedal.
IMPORTANT: Check for Water Leaks Before Replacing Parts
Before you buy a new pedal assembly, you must check for a known issue that perfectly mimics a failed sensor. General Motors issued a Technical Service Bulletin (TSB 07-06-04-019F) for these trucks. It warns that water can leak into a major wiring connector located in the driver's side kick panel area. This water intrusion can cause the exact same symptoms, including the 'Reduced Engine Power' message and the common P2138 trouble code. Always inspect this connector for moisture or corrosion to avoid a costly misdiagnosis.
Choosing a New Aftermarket Pedal Sensor
For the 2007-2013 Yukon XL 2500, you must replace the entire accelerator pedal assembly; the sensor is integrated into it. You have a choice between original equipment (OEM) and aftermarket parts.
- OEM (AC Delco): This is the same part your truck was built with. It's a safe bet for quality and fit, but typically comes at a higher price.
- New Aftermarket (Standard Ignition): Reputable aftermarket brands like Standard Ignition (also known as SMP) are a cost-effective alternative. They specialize in engine management components and offer a new part that meets or exceeds original specifications, often for less money than the OEM equivalent. For a vehicle of this age, a quality new aftermarket part is often a smarter financial choice than a used OEM part, which will have existing wear and tear.
Pro Tip: Installation is DIY-Friendly
Replacing the accelerator pedal assembly is a straightforward job that most DIY mechanics can handle in under 30 minutes. It is held in place by two or three 10mm bolts and has one simple electrical connector. Doing it yourself can save you over $100 in shop labor costs.
Cost of Replacing the Accelerator Pedal Sensor
| Part Type | Price Range |
|---|---|
| New OEM (AC Delco) | $95 - $170 |
| New Aftermarket (Standard Ignition) | $93.84 - $93.84 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions
What is the most common trouble code for a bad accelerator pedal sensor?
The most common Diagnostic Trouble Code (DTC) is P2138, which means the two sensors inside the pedal assembly are sending conflicting signals to the computer. Other related codes can include P2122, P2123, P2127, and P2128.
Is a bad pedal sensor the same as a bad throttle position sensor (TPS)?
No. The Accelerator Pedal Sensor (APS) is part of the gas pedal assembly inside the cabin. The Throttle Position Sensor (TPS) is located on the throttle body in the engine bay. While they work together in the drive-by-wire system and can cause similar symptoms, they are two separate parts.
Do I need to reprogram the computer after replacing the sensor?
Generally, no. While some very early TSBs for other GM models mentioned reprogramming, most owners and mechanics find it is not necessary for a simple pedal replacement. Some sources suggest a simple 'relearn' procedure, which can involve turning the key to the 'On' position for 10 seconds, then off, or letting the truck idle for a few minutes to allow the computer to adjust to the new sensor.
Are there any recalls for this issue on my Yukon?
Searches for the 2007-2013 GMC Yukon XL 2500 did not show any specific safety recalls for the electronic accelerator pedal sensor itself. However, GM has issued Special Coverage Adjustments for this part on other similar models, acknowledging the high failure rate. It is always a good practice to check for any open recalls using your vehicle's VIN on the NHTSA website.
Technical Specifications
OEM Part Numbers: 25832864 15847349 15101848
This is a complete pedal assembly that includes the integrated Accelerator Pedal Position (APP) sensor. It is a drive-by-wire component with a 6-pin electrical connector.
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 XL 2500: