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Error Code P1516 – Symptoms, Causes and Solutions.

The error code P1516 is defined as the Throttle Actuator Position Performance of the Throttle Control Module.


This error code is a manufacturer-specific trouble code, meaning it does not apply to all makes of vehicles. Rather, it applies only to specific brands of vehicles, such as GM (Chevrolet/GMC), Saturn, etc.. Definition specification, troubleshooting and repairs still vary from one make and model to another.


The PCM (powertrain control module, also known as ECM or engine control module) functions as the control center of the TAC system (Throttle Actuator Control).

The PCM determines the driver’s intent, and will then calculate the appropriate throttle response. The PCM obtains throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits for engine 1 control and engine 2 control.

Reads: Error Code P0748 OBD – Electrical Pressure Control Solenoid

System data CT They are monitored by two processors; both are found within the PCM. Both processors also monitor each data to verify that the indicated throttle position is correct.

The error code P1516 is detected when the PCM has determined an out-of-range condition between the intended and actual throttle position.

What does the P1516 code mean?

The Throttle Position Sensor (TAPS) provides the powertrain control module or PCM with the necessary information about throttle movement. It may be located on the throttle body or on the accelerator pedal inside the vehicle.

In either case, the sensor provides a signal of 0-5V to the PCM, with 0.5 volts as a typical starting point. Once the voltage is above 0.5, the engine is said to be off idle; until 4 volts. It’s usually around open throttle. If it is at 0.5 volts, the engine is said to be idling. The voltage will vary depending on the driver input.

The code P1516 is a manufacturer-specific code, primarily used by General Motors products, namely Buick, Chevrolet, GMC, Hummer, and Saturn. This lets you know that the diagnosis of this condition may be different between manufacturer vehicles.

In these cases, P1516 will be set when the voltage that is returned by the sensor does not match what is being received by the actual throttle position sensor or in some cases, may be a calculated throttle position. This particular code can be set if the voltage changes from normal to 0 volts or 5 volts for a very short period of time.

Common symptoms

Like others, the error codes code activates the light Check Engine and records the code into the vehicle’s memory system. Additionally, since this code affects the operation of the throttle actuator position, the vehicle will not display a throttle response.

Possible causes

Multiple factors could cause this code, such as:

  • Defective TAC module
  • TAC module wiring harness open or shorted
  • The poor electrical connection in the TAC module circuit
  • Water in the TAC module connector
  • Stuck or bent throttle body

How to check it

In some cases when this code is present, the PCM will put the vehicle into mode. “fail-safe” to prevent the vehicle from being driven much further. For diagnosis, the technician will first examine the system to accurately diagnose the code and make the appropriate fix, which of course, depends on the specific problem that caused the code.

The technician will check the TAC module for defects; will look for open or shorted harnesses in the module CT; look for faults in the electrical connection in the TAC module circuit, and will look for water in the TAC module connector.

Lastly, the technician will check the throttle body for signs of damage.

What is the cost of diagnosing the code P1516 CHEVROLET

The cost of diagnosing code P1516 CHEVROLET is 1.0 labor hours. Auto repair diagnostic time and labor rates vary depending on location, vehicle makes and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

How to repair

  • Replacing the TAC module
  • Repair or replace the TAC module harness
  • Fix a bad electrical connection in the TAC module circuit
  • Remove water from the TAC module connector
  • Fix stuck or bent throttle body, repair or replace as necessary

Be sure to check the ground wire from the TAC harness to the rear of the passenger-side engine block. In many cases, this could be the culprit in the code.

Also in some cases, the throttle body plate could be stuck due to dirt. You can try cleaning the throttle body before replacing any parts.

If you want to know other articles similar to Error Code P1516: Throttle Control Module Throttle Actuator Position Performance you can visit the category Fault Codes.


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