Throttle Actuator Control System -- Stuck Open
The P2111 code means the vehicle's onboard diagnostic system has detected: Throttle Actuator Control System -- Stuck Open. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- moderate
- Estimated cost
- $50 - $500 (parts and labor)
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Common Symptoms
- High idle speed (1500+ RPM)
- Engine revs on its own
- Vehicle surges or lurches forward
- Reduced power mode activated
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Carbon buildup preventing throttle plate from closing Very High
- Faulty electronic throttle body motor High
- Throttle return spring broken or weak Moderate
- Foreign object stuck in throttle bore Moderate
- Throttle body mounting issue causing air leak Low
Frequently Asked Questions
Can I drive with code P2111?
No. A stuck-open throttle is a serious safety concern as the engine may rev uncontrollably and the vehicle could surge forward. The PCM may enter reduced power mode, but it is safest to not drive until repaired.
Can cleaning the throttle body fix a stuck-open throttle?
Yes, this is the most common fix. Heavy carbon buildup on the throttle plate and bore prevents full closure. Remove the air intake duct, spray throttle body cleaner on the plate and bore, and wipe clean with a rag. Do not use excessive force on the throttle plate.
Is a stuck-open throttle dangerous?
Yes, it can be. If the throttle plate cannot close, the engine will rev high and the vehicle may accelerate on its own. The PCM has safety measures (reduced power, forced idle, engine shutdown) but the safest action is to stop driving immediately.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Visually inspect throttle plate with engine off -- it should close completely with no visible gap
-
Try moving throttle plate by hand (key off, connector disconnected) -- should move freely and return to closed
-
Clean throttle body thoroughly with throttle body cleaner to remove carbon deposits
-
Check throttle body return spring for proper tension -- plate should snap closed
-
If throttle plate closes freely after cleaning, perform relearn and clear codes
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
P2111 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Commonly Affected Vehicles
- 2007-2017 Chevrolet Silverado
- 2008-2016 Toyota Camry
- 2009-2018 Nissan Altima
- 2006-2015 Honda Accord
- 2010-2019 Ford F-150
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