P1516 Code: Throttle Actuator Control Module Throttle Actuator Position Performance

Most vehicles have an electronic throttle control (ETC) system that works with the powertrain control module (PCM) to adjust the air-fuel ratio, retard ignition timing, and reduce pumping losses.

The ETC system also has a throttle actuator control (TAC) module that opens and closes the throttle valve.

A problem with the TAC module can cause on-board diagnostics to log a P1516 trouble code.

Caution: Although the electronic throttle body has an internal spring designed to close the throttle plate for safety, the PCM triggers the motor and its gears to drive the throttle blade open and closed. With that in mind, remember never to open or clean the throttle body with your fingers to avoid the risk of severe injury.

Although the electronic throttle body has an internal spring designed to close the throttle plate for safety, the PCM triggers the motor and its gears to drive the throttle blade open and closed.

–Richard McCuistian, ASE Certified Master Automobile Technician

What Does the P1516 Code Mean?

Diagnostic trouble code (DTC) P1516 stands for “Throttle Actuator Control Module Throttle Actuator Position Performance.”

The PCM receives feedback from the throttle position sensor, which is connected to the accelerator pedal position sensor and throttle pedal.

The TAC module operates the throttle blade in some ETC systems.

In its normal operation, the throttle blade (throttle plate) should move and quickly return to its default position.

A fault with the throttle body assembly can cause the throttle plate to get stuck.

Note: The definition of code P1516 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

P1516 on Some Chevrolet Silverado Vehicles

In some Chevrolet Silverado vehicles, the P1516 code can be set without any driveability concerns.

Under this circumstance, it’s possible that the TAC module is operating at a battery voltage of 4.5 to 5.0 volts.

An illuminated check engine light might be the only symptom for this problem, and it won’t require you to replace any part of the electronic throttle control.

What are the Common Causes of the P1516 Code?

• Damaged throttle plate
• Faulty throttle body assembly
• Wiring issues
• Powertrain control module failure

What are the Common Symptoms of the P1516 Code?

• Illuminated check engine light
• Little to no throttle response

How to Diagnose the P1516 Code

DTC 1516 is a powertrain code that can be logged in vehicles with an OBD-II system.

While this might be the case, keep in mind that the steps for diagnosing and repairing this trouble code can vary, depending on vehicle specifications.

The diagnostic process might involve using a few tools and require you to conduct an inspection of the affected part.

If you’re not familiar with the process of diagnosing trouble codes, you can always leave the task to a professional mechanic. Otherwise, you can go ahead and do it yourself.

To help you out, here are some videos you can watch to get an idea of what the process usually involves:

How to Fix the P1516 Code

The right tools and information are crucial to resolving a P1516 code.

If you’re not confident with your DIY skills yet, it’s best to leave the job to the pros.

But if you think you can handle the task on your own, you might want to consult guides like those from Chilton or an ALLDATA subscription. These resources contain vehicle-specific repair information that can help you fix the issue.