Throttle Actuator Control Motor Current Range/Performance
The P2118 code indicates that the Powertrain Control Module (PCM) has detected an abnormal current flow in the throttle actuator control motor circuit. This motor controls the throttle plate position based on accelerator pedal input. The PCM monitors the motor's current draw and compares it to expected values; if the current is out of range or the motor performance is degraded, this code sets. Common causes include a faulty throttle body assembly, wiring issues, or a failing PCM.
1. Most Common Causes
- Faulty throttle actuator control motor (integrated in throttle body)
- Wiring or connector issues in the throttle actuator circuit
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Idle instability or stalling
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect throttle body wiring and connectors for damage or corrosion.
Step 3: Test throttle actuator motor resistance and voltage supply using a multimeter.
Step 4: Perform a throttle body relearn procedure after repairs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, including parts and labor. Replacing the throttle body assembly is the most common fix, costing around $300-$500.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.