P2100: Throttle Actuator A Control Motor Circuit/Open
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to generic code level because this page is not scoped to one make or model.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P2100.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What Does P2100 Mean?
P2100 code: Throttle Actuator A Control Motor Circuit/Open. Symptoms, likely causes, diagnostic path, severity, and repair cost context.
Symptoms of P2100
- ⚠️ Warning light or diagnostic trouble code is stored
- ⚠️ Reduced power, unstable throttle response, high idle, or limp mode may occur
- ⚠️ Traction/stability messages may appear when throttle data is implausible
- ⚠️ Vehicle may fail an emissions or safety inspection until the code is resolved and monitors reset
Common Causes
- 🔍 Sensor reading, wiring, connector, actuator, emissions, or module condition detected by the control module
- 🔍 Low battery voltage, poor ground, software, or network issue affecting the related circuit
- 🔍 Mechanical condition that should be confirmed with live data before replacing parts
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"On January 1, my wife was returning home from a grocery run when our 2019 Forester’s dashboard suddenly lit up like a Christmas tree--Check Engine, EyeSight, Anti-Lock Brakes, Anti-Skid, and blue Temperature lights all came on simultaneously. The Forester did not lose any appreciable power but the "
— Subaru Forester owner, 2023-01-01
Source: NHTSA Complaints Database
Most Reported Vehicles for P2100
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | SUBARU FORESTER |
Frequently Asked Questions
Is P2100 enough to replace a part?
Can I drive with P2100?
What To Do Next
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.