What Does P1516 Mean?
The throttle actuator control module has detected that the actual throttle position does not match the commanded position beyond acceptable parameters. This indicates a performance issue with the electronic throttle control system's ability to accurately position the throttle plate.
Safety Warning
Potentially unsafe to drive. Vehicle may enter reduced power mode, experience unpredictable throttle response, or sudden power loss. Address immediately.
Common Causes
35%
Carbon buildup on throttle plate and bore restricting movement
30%
Failing throttle actuator motor or worn motor brushes
20%
Throttle position sensor correlation issue or drift
10%
Damaged throttle body gear mechanism or binding throttle shaft
5%
Software calibration issue or TAC module fault
Diagnostic Steps
1
Step 1: Monitor live throttle position data with scan tool during slow throttle sweep (compare commanded vs actual position)
2
Step 2: Inspect throttle body for carbon deposits and clean if necessary using proper throttle body cleaner
3
Step 3: Check for binding by manually opening throttle plate with engine off (should move smoothly)
4
Step 4: Perform throttle relearn/adaptation procedure per manufacturer specifications
5
Step 5: Test throttle actuator motor operation and current draw during commanded movements
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The throttle actuator control module has detected that the actual throttle position does not match the commanded position beyond acceptable parameters. This indicates a performance issue with the electronic throttle control system's ability to accurately position the throttle plate.
The most common cause of P1516 (Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance) is: Carbon buildup on throttle plate and bore restricting movement
Typical repair costs for P1516 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Potentially unsafe to drive. Vehicle may enter reduced power mode, experience unpredictable throttle response, or sudden power loss. Address immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1516 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
