Chevrolet S10 Throttle Position Sensor Guide (1999-2004)
Fix your S10's hesitation, rough idle, and poor shifting by understanding and replacing the throttle position sensor.
- A bad TPS causes hesitation, rough idle, and erratic shifting; it's a common failure item.
- Replacement is very easy, requires basic tools, and can be done in under 30 minutes.
- The same sensor fits both the 2.2L and 4.3L engines for the 1999-2004 S10.
- Invest in a quality aftermarket brand like Delphi or Standard Ignition to avoid repeat failures.
Is Your S10 Showing Signs of a Bad Throttle Position Sensor?
A failing throttle position sensor (TPS) on a 1999-2004 Chevrolet S10 can cause a lot of headaches. Because the sensor sends bad information to the engine computer, the truck may run poorly. You might notice one or more of these common symptoms:
- Hesitation or Stumbling: The truck might hesitate or stumble when you press the gas pedal.
- Rough Idle: Your engine might idle roughly, surge up and down, or stall completely.
- Poor Acceleration and Lack of Power: The truck feels sluggish and doesn't have the power it used to.
- Erratic Automatic Shifting: The transmission may shift hard, late, or at strange times. This is because the computer doesn't know the correct throttle position to command a smooth shift.
- Check Engine Light: A bad TPS will often trigger the "Service Engine Soon" or Check Engine Light. Common codes include P0121 and P0122. 🎬 Watch: How to test your sensor before buying a replacement.
Choosing the Right Aftermarket TPS for Your S10
For the 1999-2004 S10, the same throttle position sensor is used for both the 2.2L 4-cylinder 🎬 See this step-by-step replacement guide for the 2.2L engine. and 4.3L V6 engines. 🎬 Watch: How to replace the sensor on a 4.3L V6. When choosing a replacement, quality matters. While cheap parts are tempting, they often fail quickly, forcing you to do the job again. Here’s a breakdown of available brands:
- Top Tier (Recommended): Brands like Delphi and Standard Motor Products (Standard Ignition) are highly recommended. Delphi was an original equipment (OE) supplier for GM, and their parts are known for quality and reliability. Standard is also a well-respected brand that makes durable sensors. Choosing one of these brands is your best bet for a long-lasting repair.
- Mid & Budget Tier: Brands like Dorman, Walker, and other store brands offer a lower price. However, their quality can be inconsistent for electronic parts. Some owners report these parts failing in less than a year. An NGK sensor was reported by one user to cause idling issues. If your budget is tight, they can work, but be aware you might be replacing it again sooner than you'd like.
Pro Tip: Avoid the cheapest no-name sensors from online marketplaces. Forum users and mechanics consistently advise that these parts have a very high failure rate, causing the same problems to return quickly.
How Much Does a New TPS Cost?
Replacing the TPS is an affordable repair, especially if you do it yourself. The part itself is not expensive, and installation is simple.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $25 - $75 |
| Shop Labor | $90 - $140 |
| Total (Shop Repair) | $134 - $186 |
Frequently Asked Questions
Is replacing the S10 TPS a DIY job?
Yes, absolutely. This is a great beginner-level repair. It only requires basic hand tools (like a screwdriver and a small Torx bit), and it's located in an easy-to-reach spot on the side of the throttle body. The entire job can be done in under 30 minutes.
Do I need to do anything after installing the new sensor?
It's a good practice to disconnect the battery's negative terminal before you start the repair. After installing the new sensor and reconnecting the battery, the check engine light may turn off on its own after a few drives. You can also clear the code immediately with an OBD-II scanner.
Are there any recalls for the S10 throttle position sensor?
No, there are no recalls or common Technical Service Bulletins (TSBs) from GM for the throttle position sensor on the 1999-2004 Chevrolet S10.
What is the most common mistake when ordering this part?
The most common mistake is buying a very cheap, unbranded sensor to save a few dollars. These parts are known to be unreliable and often fail quickly. For a critical sensor like the TPS, it is worth spending a little more on a quality brand like Delphi or Standard Motor Products to ensure reliability and avoid doing the job twice.
Helpful Videos
Technical Specifications
OEM Part Numbers: 17106809 17113578 17113625 17123852
Fits 1999-2004 Chevrolet S10 with 2.2L or 4.3L engine. Mounts to the side of the throttle body with two screws and has a 3-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.
- Chevrolet S10: