The TACM is responsible for adjusting the throttle plate opening electronically, based on commands from the PCM. A P063 code could indicate several potential problems:
* Faulty Throttle Actuator Control Motor (TACM): The motor itself may be failing or has already failed. This is a common cause.
* Wiring Problems: Damaged, shorted, or corroded wires in the TACM circuit can prevent proper communication between the PCM and the actuator.
* PCM Problems: While less likely, a problem with the PCM itself could also set this code.
* Power Supply Issues: A lack of proper voltage to the TACM could also trigger the code.
* Throttle Position Sensor (TPS): A faulty TPS can sometimes lead to this code, though it's more likely to set other codes as well.
What to do:
You should have this code diagnosed by a qualified mechanic. Simply clearing the code won't solve the underlying problem. The mechanic will need to perform a proper diagnostic to pinpoint the root cause, which might involve:
* Visual inspection of the wiring: Checking for any damage, corrosion, or loose connections in the TACM circuit.
* Testing the TACM: To determine if the motor itself is functioning correctly.
* Testing the TPS (Throttle Position Sensor): To rule out a faulty sensor.
* Checking for power and ground: Ensuring the TACM is receiving the correct voltage and ground.
* Scanning for other codes: Sometimes, additional codes will provide further clues.
Ignoring this code could lead to driveability problems, including poor acceleration, rough running, or even the inability to start the vehicle. Get it checked out as soon as possible.
