Throttle Actuator Control Motor Circuit Low
The P2102 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the throttle actuator control motor circuit. This motor is responsible for opening and closing the throttle plate based on driver input via the accelerator pedal. A low voltage reading suggests a short to ground, open circuit, or faulty component, which can prevent the throttle from operating correctly, leading to reduced engine power or a no-start condition.
01. Most Common Causes
- Faulty throttle actuator control motor
- Short to ground or open in the motor circuit wiring
- Corroded or damaged connectors in the throttle body harness
- 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 no-start
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for additional codes.
Step 2: Visually inspect the throttle body wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the throttle actuator motor resistance and voltage supply using a multimeter; compare to manufacturer specs.
Step 4: If wiring and motor are okay, test the PCM output signals; replace PCM if faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may enter limp mode with reduced power, or the throttle may fail completely, causing a loss of control. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. A throttle body replacement can cost $200-$500, while wiring repairs are usually less expensive.