P2111
Actuator Control System - Stuck OpenP2111 is a generic OBD-II powertrain diagnostic trouble code: Actuator Control System - Stuck Open. It is logged by the engine control unit when the scr/adblue monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P2111 means
P2111 is set when the powertrain control module (PCM) detects that the electronic throttle plate is mechanically or electrically unable to close from an open position. In a drive-by-wire system there is no physical cable between the accelerator pedal and the throttle body; instead, the PCM commands a small DC motor inside the throttle body to move the plate. When the PCM commands closure but the throttle position sensors continue to report an open angle, P2111 is triggered.
The most frequent root cause is carbon or varnish deposits that build up on the throttle bore and plate over time, eventually preventing the plate from seating fully. A failed actuator motor, a broken return spring inside the throttle body, or a seized throttle shaft can have the same effect. Electrical faults — a short or open in the motor drive circuit, corroded connectors, or a high-resistance ground — can also cause the PCM to lose control of the plate position.
Because an uncontrolled open throttle is a safety risk, the PCM immediately activates fail-safe (limp) mode: engine output is severely curtailed, often to a fixed low idle or a hard power cap, and the vehicle may refuse to rev above a set threshold. In some cases the engine will not start at all. The check engine light will be illuminated, and additional related codes such as P2135 (TPS correlation) or P0638 (throttle actuator range) are commonly stored alongside P2111.
Diagnosis begins with verifying the fault with a capable scan tool that can display live throttle-plate angle versus commanded angle. A simple throttle body cleaning often resolves carbon-related sticking. If the plate moves freely by hand but the code persists, electrical testing of the actuator motor and its wiring is the next step. PCM replacement is rare and should only be attempted after all other causes are ruled out.
Common causes
Most-frequently reported root causes when P2111 is logged.
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1
Carbon or varnish buildup locking the throttle plate in an open position
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2
Failed or seized throttle actuator motor
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3
Broken throttle return spring inside the throttle body assembly
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4
Corrosion or water intrusion in the throttle body or its wiring connector
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5
Open or short circuit in the throttle actuator motor drive wiring
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6
Faulty throttle position sensor (TPS) reporting incorrect plate angle
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7
Damaged throttle body bore (warped, scored, or debris obstruction)
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8
Loose or damaged PCM pin for the throttle motor circuit
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9
Faulty PCM (rare, last resort)
Symptoms drivers notice
How to diagnose P2111
A typical diagnostic flow when this code is present.
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1
Connect a scan tool and confirm P2111; note all stored and pending codes, and capture freeze-frame data
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2
Inspect the throttle body visually for carbon deposits, debris, or a stuck plate; manually rotate the plate by hand to feel for binding
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3
Clean the throttle body with an appropriate cleaner if deposits are found; re-test before further disassembly
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4
Use the scan tool live data to compare commanded throttle angle against actual TPS-reported angle during key-on
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5
Test the throttle actuator motor resistance and the motor drive circuit wiring with a multimeter per the manufacturer service manual
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6
Inspect all wiring, connectors, and grounds between the throttle body and PCM for corrosion, chafing, or loose terminals
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7
If wiring and mechanical checks pass, perform PCM pinpoint tests; replace PCM only after all other causes are excluded
Related powertrain codes
- B0001 — PCM Discrete Input Speed Signal Error
- B0004 — PCM Discrete Input Speed Signal Not Present
- C0359 — Four Wheel Drive Low Range (4LO) Discrete Output Circuit
- C0362 — 4LO Discrete Output Circuit High
- P2000 — NOx Adsorber Efficiency Below Threshold Bank 1
- P2001 — NOx Adsorber Efficiency Below Threshold Bank 2
Frequently asked questions
Is it safe to drive with a P2111 code?
No. The vehicle will typically be in limp mode with severely reduced power, and an uncontrolled open throttle creates a genuine safety risk.
Can cleaning the throttle body fix P2111?
Yes, in many cases. Carbon deposits are the most common cause of a stuck-open throttle plate.
What other codes typically appear alongside P2111?
P2135 (TPS A/B voltage correlation), P0638 (throttle actuator control range/performance), P2100 (throttle actuator motor circuit open), and accelerator pedal position codes (P2120–P2127) are commonly co-stored.
How does the PCM know the throttle is stuck open?
The PCM compares its throttle-plate command signal to the feedback voltage from one or more throttle position sensors.
Does P2111 always mean the throttle body must be replaced?
Not necessarily. Cleaning resolves carbon-related sticking in many cases.
Disabling P2111 in software
RaceTune can permanently disable P2111 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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