Accelerator Pedal Sensor for the 2008-2015 Chevrolet Silverado 1500
Experiencing 'Reduced Engine Power' in your Silverado? Your accelerator pedal sensor is a common and very fixable cause.
- The 'Reduced Engine Power' message combined with code P2138 almost always points to a failed accelerator pedal sensor.
- Replacement is a simple, DIY-friendly job requiring only basic tools and less than an hour.
- The sensor is integrated into the entire pedal assembly; you must replace the whole unit.
- While quality aftermarket parts exist, some mechanics report issues and prefer using the OEM part for this specific component to ensure reliability.
If your Silverado suddenly loses power and flashes a warning message, a faulty accelerator pedal sensor is a prime suspect. This component is critical for telling your truck how fast you want to go. When it fails, the truck's computer gets confused and enters a protective 'limp mode' to prevent unpredictable acceleration. Fortunately, this is a well-documented issue and the replacement is straightforward for a DIYer.
Symptoms of a Failing Accelerator Pedal Sensor
A bad pedal sensor will almost always make its presence known. Watch for these clear indicators:
- "Reduced Engine Power" Message: This is the most common symptom. The driver information center will display this message, and your truck's speed and acceleration will be severely limited.
- Check Engine Light: The check engine light will illuminate, storing a diagnostic trouble code. The most common code associated with this failure is P2138.
- Poor Throttle Response: You may experience a noticeable delay, hesitation, or surging when you press the gas pedal. In some cases, the pedal may not respond at all.
- Warning Lights for Traction Control/Stabilitrak: It's common for "Service Traction Control" or "Service Stabilitrak" messages to appear alongside the reduced power warning, as these systems rely on accurate throttle data.
A Note on Recalls and Special Coverage
While there are no formal safety recalls for the sensor itself on these models, GM has acknowledged the problem. They issued Technical Service Bulletins (TSBs) and a Special Coverage Adjustment (N182188250) that extended the warranty for this specific part to 10 years or 150,000 miles for some vehicles. This was due to a known issue with the sensor's internal circuitry causing code P2138. 🎬 Watch: The real fix for P2138 and reduced power messages. Always check with a dealer to see if your specific vehicle is still covered, even if you are outside the standard warranty.
Choosing the Right Aftermarket Part
When replacing the accelerator pedal assembly, you have a choice between OEM (Original Equipment Manufacturer) and aftermarket parts. For many components, aftermarket parts offer a great value. However, for this specific part on the Silverado, the decision is more nuanced.
- OEM (ACDelco/GM Genuine): This is the part your truck was built with. It guarantees perfect fit and function. Some experienced mechanics strongly recommend using the OEM part, citing instances where new aftermarket sensors were faulty right out of the box or failed prematurely.
- Aftermarket (Standard Ignition): Reputable aftermarket brands like Standard Ignition produce quality components that meet or exceed OE specifications. They are a cost-effective alternative and are often more readily available. While some users report success, be aware of the potential for issues as noted by some mechanics.
Pro Tip: Given the critical nature of this part and the mixed reports from the field, if the price difference is small, opting for the OEM pedal assembly can provide extra peace of mind. If you choose an aftermarket part, select a quality brand with a good warranty.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $95 - $170 |
| New Aftermarket (Standard Ignition) | $93.84 |
| Used OEM | $50 - $80 |
| Shop Labor for Installation | $80 - $120 |
Frequently Asked Questions
Do I need to program the new accelerator pedal?
No, a special programming or 'relearn' procedure is not typically required. After installing the new pedal, disconnecting the battery for about 15 minutes will reset the computer, allowing it to recognize the new sensor's default values upon reconnection.
Is this a difficult repair to do myself?
No, this is a very easy DIY job. It involves disconnecting the battery, unplugging one electrical connector, and removing two T30 Torx bolts that hold the pedal assembly to the firewall. The entire process can be done in under 30 minutes with basic hand tools.
🎬 Watch: Step-by-step walkthrough for replacing the pedal assembly.What is code P2138?
P2138 stands for 'Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation'. The pedal assembly has two internal sensors for safety. This code means the truck's computer is seeing conflicting voltage signals from these two sensors, can't trust the input, and triggers the 'Reduced Engine Power' mode as a precaution.
Could something else cause the 'Reduced Engine Power' warning?
Yes. While the pedal sensor is a very common cause, the issue can also be caused by a dirty or failing throttle body, a bad ground wire, or damaged wiring between the pedal and the computer. However, if you have code P2138, the pedal assembly is the most likely culprit.
🎬 See how to fix reduced engine power and related codes.Helpful Videos
Technical Specifications
OEM Part Numbers: 25832864 15101848 15847349
This is a complete pedal and sensor assembly. It is a 'drive-by-wire' component with two internal position sensors for signal redundancy. The part is a direct-fit replacement and requires no special programming.
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.
- Chevrolet Silverado 1500: