The throttle position sensor (TPS) on a 2008 Chevy Silverado is mounted directly to the throttle body, which sits atop the intake manifold. It’s a small three‑wire sensor attached to the side of the throttle body and is easiest to access from the engine bay after removing the air intake duct.
What the TPS does
The TPS monitors the position of the throttle plate and provides a voltage signal to the engine control module. This signal helps control fuel delivery and idle speed as part of the Silverado’s electronic throttle control system. Problems with the TPS can cause rough idling, reduced power, or poor acceleration.
Where to find it on the 2008 Silverado
In most 2008 Silverado configurations (4.3L, 4.8L, 5.3L, and 6.0L engines), the TPS is built into the throttle body. The throttle body sits on top of the intake manifold, usually toward the passenger side of the engine bay. The sensor itself is a small rectangular module mounted to the throttle body with a 3‑pin connector. Access is easier after removing the air intake duct or tube that leads to the throttle body.
Before you begin the search, note that the exact appearance can vary slightly by engine size, but the location remains the same: mounted on the throttle body itself.
To locate the TPS, follow these quick locator steps:
- Open the hood and remove the air intake tube from the air box to expose the throttle body.
- Find the throttle body on top of the intake manifold, generally on the passenger side of the engine bay.
- Look for a small rectangular sensor attached to the side or rear of the throttle body with a 3‑pin electrical connector.
- Confirm the connector and sensor orientation before disconnecting or removing any wiring or screws (note the sensor’s mounting screws, usually two small ones).
Concluding the locator steps: On a 2008 Silverado with electronic throttle control, the TPS is not a standalone bolt‑on part far away from the throttle body—it is integral to the throttle body itself, so replacing the sensor often means replacing the entire throttle body assembly if needed.
Safety and quick checks
When inspecting or handling the TPS, disconnect the negative battery terminal and handle connectors gently. If you’re diagnosing TPS issues, use an OBD-II scanner to check for TPS-related fault codes and consider testing the sensor with a multimeter or consulting the service manual for the specific voltage range for your engine.
Summary
For a 2008 Chevy Silverado, the throttle position sensor is mounted on the throttle body, which sits atop the intake manifold on the engine. Access it by removing the air intake duct and locating the small three‑pin sensor on the side of the throttle body. In many cases, a faulty TPS is addressed by replacing the entire throttle body assembly rather than the sensor alone.