P2102 is an OBD-II trouble code that stands for "Throttle Actuator 'A' Control Motor Circuit Low." This code indicates that the powertrain control module (PCM) has detected a low voltage signal from the throttle actuator control motor circuit. The throttle actuator is responsible for controlling the opening and closing of the throttle plate, which regulates the amount of air that enters the engine. If the PCM does not see the expected voltage signal from the throttle actuator, it will set P2102 and illuminate the check engine light. There are a few possible causes of P2102, including: A faulty throttle actuator A short or open in the throttle actuator control motor circuit A defective PCM If P2102 is set, it is important to have the vehicle diagnosed by a qualified technician as soon as possible. Driving with a P2102 code can cause the engine to run rough, stall, or experience reduced fuel economy. In some cases, it can also lead to engine damage. Here are some steps that a mechanic may take to diagnose P2102: Connect a diagnostic scanner to the vehicle and retrieve the stored codes. Visually inspect the throttle actuator for damage. Test the voltage signal from the throttle actuator control motor circuit. Replace the throttle actuator if it is faulty. Repair or replace any wiring or connectors that are damaged or corroded. Replace the PCM if it is defective. The cost of diagnosing and repairing P2102 will vary depending on the make and model of the vehicle, as well as the severity of the issue. In general, however, the cost should be around $100-$200 for diagnosis and $200-$400 for repairs.
