P1516 code — how to fix error fast
Understanding the P1516 code is vital for vehicle longevity. Dive deeper into its meaning today.
If you notice a problem with the way your car accelerates and the scanner tool reveals the code P1516, you probably have quite a few questions. First and foremost is getting to know the P1516 code meaning and why it appeared in your car. Knowing how it affects your driving comes right after, so we prepared a detailed guide to tackle all the issues regarding the code.
You can be the judge as to how the code reflects on your vehicle, but only once you’ve gone through this article with all the essential information on how to diagnose it, fix it, and make sure your car drivers smoothly after erasing the code.
Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..
What does the P1516 code mean?
The P1516 code is a generic powertrain code that relates to the electronic throttle control system (ETCS). The code indicates that there is an issue with the throttle actuator control module (TACM) or the throttle actuator control (TAC) system. The TAC system is responsible for receiving input from the accelerator pedal position sensor (APPS) and sending a signal to the engine control module (ECM) to adjust the throttle opening accordingly.
We know – it can be confusing to look at it as a bunch of random codenames and car parts. If you aren’t that much of a car guy, let us put it this way – the electronic throttle control system measures your output on the accelerator pedal and ensures that the throttle body opens accordingly with it.
Back in the day, there was no electrical system in place so the link between the pedal and the throttle body was physical. Still, these days the modernization of cars took its turn and that means it’s time to explore the reasons behind the system’s malfunction.
What causes the P1516 code?
There are several potential reasons behind the activation of code P1516. The crucial step to take toward fixing it is to uncover the exact reason behind it, so here’s our list of the most probable suspects:
TAC system malfunction
A malfunctioning TAC system is the most common cause of the P1516 code. This malfunction can occur due to several reasons, such as a defective TAC motor, a damaged TAC circuit, or a faulty TAC module.
Symptoms of a TAC system malfunction include a lack of power, idle surging, and reduced fuel efficiency.
Wiring problems can also cause the P1516 code, such as damaged or corroded wires. These issues can cause a short circuit or open circuit in the TAC system, leading to the code’s appearance.
An ECM malfunction can also cause the P1516 code, as the ECM is responsible for controlling the TAC system. A faulty ECM can send incorrect signals to the TAC system, leading to the code’s appearance.
Symptoms of an ECM malfunction include stalling, poor fuel efficiency, and engine misfires.
Which car models does the P1516 code affect the most?
While this code can affect a wide range of car models, some are more likely to experience this issue than others.
Here are some car models that are known to be most likely to be affected by the code P1516:
- Chevrolet Silverado: The 2003-2007 models of the Chevrolet Silverado are known to be prone to the P1516 code due to a faulty throttle actuator control (TAC) module.
- Cadillac CTS: The 2004-2007 Cadillac CTS is another model that commonly experiences the P1516 code due to a malfunctioning TAC module.
- GMC Sierra: Like the Chevrolet Silverado, the 2003-2007 GMC Sierra is also susceptible to the P1516 code due to a defective TAC module.
- Hummer H2: The 2003-2007 Hummer H2 is another model that may experience the P1516 code due to an issue with the TAC module.
How to diagnose the P1516 code
While diagnosing the code P1516 requires quite a few diagnostic tools, there are other ways of getting to know what causes the issue besides using a scanner tool. These methods include the following options:
Once the code has been retrieved, the mechanic will perform a visual inspection of the vehicle’s throttle control system. This may involve checking for damaged wires or connectors, loose connections, or other visible signs of damage.
Throttle body cleaning
In some cases, the P1516 code may be triggered by a dirty or clogged throttle body. If this is suspected, the mechanic may clean the throttle body using a specialized cleaner and retest the system.
TAC module replacement
If the visual inspection and cleaning do not resolve the issue, the mechanic may need to replace the throttle actuator control (TAC) module. This component is responsible for regulating the throttle opening and may fail due to wear and tear or other issues.
If damaged wiring or connectors are identified during the visual inspection, the mechanic may need to repair or replace these components to restore proper functionality.
How to fix the P1516 code
Now that you have all it takes to diagnose the issue, you are already halfway there to finally get rid of the bothersome feat. So, the next step is to fix the problem once and for all, and here are the main methods of doing so:
Throttle body cleaning
In some cases, the P1516 code may be triggered by a dirty or clogged throttle body. If this is suspected, the mechanic may clean the throttle body using a specialized cleaner. This can help to remove any debris or buildup that may be interfering with the throttle control system.
TAC module replacement
The throttle actuator control (TAC) module is responsible for regulating the throttle opening in modern vehicles. If this component fails, it can trigger the P1516 code. In these cases, the mechanic may need to replace the TAC module with a new one to restore proper functionality.
Damaged wiring or connectors can also cause the P1516 code to appear. If this is the case, the mechanic may need to repair or replace these components to restore proper communication between the different parts of the throttle control system.
In some cases, a software update may be required to fix the P1516 code. This is particularly true if the issue is related to a programming glitch or bug in the vehicle’s computer system. In these cases, the mechanic will need to update the software with the latest version provided by the manufacturer.
How to prevent the P1516 code
Routine maintenance can help prevent the P1516 code from appearing. Here are some preventative measures:
- Regularly inspect and maintain the TAC system
- Keep the TAC system clean and free of debris
- Follow the manufacturer’s recommended maintenance schedule
In conclusion, understanding the P1516 code and diagnosing and fixing the issue promptly can help prevent further damage and ensure that your vehicle runs smoothly.
As for our final say regarding this code, it’s pretty simple – try to repair and fix the damage as soon as you spot the code to prevent having to deal with driving safety issues. Since the code can lead to serious issues with the throttle response and acceleration, it’s best to instantly fix the underlying issue so you can continue to drive safely.
What causes the P1516 code?
The P1516 code can be caused by several factors, including a malfunctioning TAC module, damaged wiring or connectors in the throttle control system, or a dirty or clogged throttle body.
Is it safe to keep driving with the code P1516?
We wouldn’t recommend you to keep driving without fixing the issue that caused the code P1516 first since it can drastically affect the throttle response of your car.
How can I prevent the P1516 code from appearing?
Routine maintenance can help prevent the P1516 code from appearing. This includes inspecting and maintaining the TAC system, keeping it clean and free of debris, and following the manufacturer’s recommended maintenance schedule.