P2100
Throttle Actuator Control Motor Circuit/Open
Severeengine
Overview
The P2100 code indicates the engine control module has detected a throttle actuator control motor circuit/open condition. This is an engine-related diagnostic trouble code that may indicate a mechanical or control issue affecting the engine's operation. Depending on the severity, this code may require immediate attention to prevent engine damage.
Symptoms
- Engine running rough or stalling
- Reduced engine power
- Vehicle goes into reduced power mode
- Unusual engine noises (knocking, ticking)
Common Causes
- Clogged PCV valve or crankcase ventilation
- Worn or damaged engine components
- Low or dirty engine oil
- Blown head gasket
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Check engine oil level and condition; change if overdue
- 3Perform a compression and leak-down test
- 4Inspect related sensors and their wiring connections
- 5Listen for unusual engine noises indicating mechanical issues
Estimated Repair Cost
$200 — $3,000
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Nissan MaximaHonda CivicFord MustangDodge Charger
Related Codes
More Engine Codes
Frequently Asked Questions
Engine codes can range from minor sensor issues to critical mechanical failures. If you notice overheating, knocking, or significant power loss, stop driving and have the vehicle towed to a mechanic.