Throttle Actuator Control Module Performance
The P2108 code indicates that the Powertrain Control Module (PCM) has detected a performance issue with the Throttle Actuator Control (TAC) module. This module controls the electronic throttle body, which regulates air intake based on accelerator pedal position. The PCM monitors the TAC module's response and sets this code when the module fails to perform within expected parameters, often due to internal faults, wiring issues, or communication errors.
01. Most Common Causes
- Faulty throttle actuator control module
- Wiring or connector issues in the TAC circuit
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Engine stalling or rough idle
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the throttle actuator control module and its wiring for damage, corrosion, or loose connections.
Step 3: Test the TAC module power and ground circuits with a multimeter.
Step 4: Perform a throttle body relearn procedure if applicable.
Step 5: If all checks pass, replace the TAC module and reprogram if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The TAC module itself costs $50-$200, plus diagnostic and labor fees.