P1516 Chevy Code: Throttle Position Sensor Issues Explained

The P1516 Diagnostic Trouble Code (DTC) is a common issue that arises in the throttle actuator control (TAC) system of Chevrolet vehicles. In this article, we will explore the meaning of the P1516 Chevy code, common symptoms, potential causes, and possible solutions. 

By understanding this code and its implications, Chevy owners and technicians will be equipped with the knowledge to diagnose and resolve throttle-related issues effectively.

Let’s get started!

P1516 Chevy: A Quick Overview

Take a look at the summary of the P1516 for Chevy!

  • Definition: Throttle Actuator Control Module/ Throttle Actuator Position Performance
  • Severity: High
  • DIY Skill Level: Advance
  • Continue To Drive?: No
  • Estimated Repair Cost: $60 – $600

What Does The P1516 Mean In Chevy Vehicles?

The P1516 Chevy DTC indicates a potential issue with the TAC module. This code suggests that there is a malfunction or a communication problem between the TAC module and the Engine Control Module (ECM), which is responsible for managing various engine functions.

When the P1516 DTC is triggered, it typically points to a fault within the TAC system, affecting the electronic throttle body’s operation. The electronic throttle control system plays a crucial role in regulating the engine’s air intake and improving overall performance. The P1516 DTC is commonly encountered in various Chevrolet models, including: the Silverado, Tahoe, Suburban, Trailblazer, etc.

Sometimes, the P1516 DTC may be accompanied by additional diagnostic trouble codes, which can provide further insight into the underlying issue. Some of the common accompanying codes include: P2101, P2119, P2135, and P2176.

How Serious Is The P1516 Chevy Code?

The severity of the P1516 DTC in Chevy vehicles can vary. In general, a P1516 code indicates a potentially serious problem, and it is not advisable to continue driving with this code. The issue can result in reduced engine power and driveability issues. While it may not pose an immediate safety risk, driving with the P1516 code can impact drivability and performance. 

It is recommended to seek professional assistance promptly to diagnose and resolve the issue. Ignoring the code may lead to further damage and increased fuel consumption. 

What Are The Signs Of The P1516 Chevy Code?

Here are some common signs of P1516 in Chevrolet vehicles:

  • Illuminated check engine light (MIL)
  • “Reduced engine power” message on the dashboard
  • Engine hesitation or stumbling
  • Throttle response issues
  • Reduced fuel efficiency
  • Poor acceleration

What Are The Causes Of The P1516 Code In Chevrolet Vehicles?

The P1516 Chevy code can be caused by various reasons, including:

  • Faulty throttle position sensor (TPS)
  • Malfunctioning throttle body
  • Wiring or connector issues in the TAC system
  • Carbon build-up in the throttle body
  • ECM software or calibration problems
  • Defective TAC system

Read more: P1345 Chevy: Meaning, Symptoms, Causes and Fixes

How To Diagnose And Repair P1516 Chevrolet Code?

Diagnosing and repairing the P1516 Chevy code requires identifying the underlying causes. In this section, we will provide an overview of the essential tools and parts needed, a step-by-step procedure for diagnosis and repair, as well as discuss the level of DIY repair and estimated costs.

Diagnostic Tools And Essential Parts

To diagnose and repair the P1516 Chevy code, you may need the following tools and parts:

Step-by-Step Guide 

  1. Connect a scan tool or OBD-II code reader to retrieve and record the specific trouble codes, including P1516.
  2. Inspect the throttle body and wiring connections for any visible damage or loose connections. Repair or replace the throttle body and its wiring if needed.
  3. Use a multimeter to test the TPS sensor for proper voltage readings. If the sensor is defective, repair or replace it.
  4. Clean the throttle body and TPS using throttle body cleaner and electrical contact cleaner.
  5. Clear the trouble codes using the scan tool and test drive the vehicle to ensure that you have resolved the issue.


  • Be cautious when working with electrical components and ensure the battery is disconnected before starting any repairs.
  • Follow the manufacturer’s instructions and specifications for testing and replacing components.
  • Thoroughly clean the throttle body and TPS to ensure proper functionality.

Read more: P1101 Intake Air Flow System Performance in Chevy Cruze Vehicles

DIY Repair Level And Estimated Costs

Diagnosing and repairing the P1516 Chevy code can range in difficulty depending on the specific cause. DIY enthusiasts with moderate automotive repair experience can perform basic cleaning and inspection. However, for more complex issues or component replacements, it is recommended to consult with an expert or qualified mechanic.

The estimated cost for repairing the P1516 code can vary depending on the cause and the parts required. Here is a general cost breakdown:

Repair TaskEstimated Cost
Throttle body cleaning$60 – $120
Repairing wiring/connectors$60 – $130
Replacement of the TPS$100 – $250
Throttle body replacement$300 – $700

Please note that the costs provided are estimates and can vary based on factors such as the vehicle model, location, and labor rates. For accurate quotes, we recommend reaching out to local repair shops or mechanics. They can provide precise estimates based on your specific vehicle and the labor rates in your area.


Ready to tackle the P1516 code in your Chevrolet? With the insights you’ve gained, confidently diagnose and resolve this issue. Share this valuable information with fellow Chevy owners who may be facing similar challenges.

If you have any questions or success stories, we’re here to listen in the comments section below. Keep your Chevy running smoothly and stay tuned for more expert automotive guides. Drive with confidence!

Reference Sources

  1. Wikipedia, Throttle position sensor
  2. CarParts.com, What Is a Throttle Actuator? Function and Symptoms of Failure Explained.