Cadillac P1516: Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

What Does The Cadillac P1516 Code Mean?

This code indicates that the actual throttle position does not match the predicted throttle position for greater than 1s.

Conditions for setting the DTC:

• P1516 and P2101 DTC P0606 and P1682 is not set.
• The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
• The engine is running or the following conditions are met: The engine is not running. The ignition voltage is greater than 11 V. The TAC system is not in the Battery Saver mode. The ECM is commanding the throttle. The ECM has learned the minimum throttle position.

DTC P1516 and P2101 run continuously when the above conditions are met.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> ACDelco Professional 213-4668 Throttle Position Sensor
>>> HOWYAA HVE72A Electronic Fuel Injection Throttle Body Assembly for 07-11 Cadillac
>>> CRC 05078 Throttle Body and Air-Intake Cleaner - 12 Wt Oz.
>>> GM Genuine Parts 12588923 Fuel Injection Throttle Control Actuator Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• GM, 2013, Service Bullettin – Prior To Any Circuit Testing.
• GM, 2012, Service Bullettin – Diagnosis and Repair – Malfunction Indicator Lamp (MIL) Illuminated, Reduced Engine Power Message Displayed, DTC P2135 Set.
• GM, 2013, Service Bullettin – Special Coverage Adjustment – Throttle Position Sensor Replacement.
• GM, 2013, Service Bullettin – Special Coverage Adjustment – Throttle Position Sensor Replacement.
• GM, 2012, Service Bullettin – Special Coverage Adjustment – Throttle Position Sensor Replacement.
• GM, 2015, Service Bullettin – Special Coverage Adjustment – Throttle Body – Reduced Power Mode.
• GM, 2015, Service Bullettin – Special Coverage Adjustment – Throttle Body – Reduced Power Mode.
• GM, 2015, Service Bullettin – PIP4578B SES Light, Idle Surge, and/or Reduced Engine Power Mode with DTCs P0068, P0121, P0506, P0507, P1516, P2101, P2119, and/or P2176 – Clean Throttle Body and Perform Idle Learn
  Reset.
• GM, 2019, Service Bullettin – PIP5660 Diagnostic Tip: MIL Illuminated Possible Reduced Engine Power Message with DTC P2101 and/or P1516 Set as Current or History.
• GM, 2019, Service Bullettin – PIP5673 PQC E01 ECM Restriction.