P2112
Throttle Actuator Control System - Stuck Closed
Encountering the engine check light code P2112 signifies an explicit mechanical or electrical operational breakdown categorized as "Throttle Actuator Control System - Stuck Closed". Professional scanner tools usually flag this subsystem loop early on.
Driver's Summary
Code P2112 means your vehicle detected a problem with the throttle actuator control system - stuck closed system. On the road, this usually shows up as engine cranks but won't start, or starts and stalls immediately. This is a serious fault — avoid extended driving and have your vehicle inspected by a mechanic as soon as possible to prevent further damage.
Symptoms
Engine cranks but won't start, or starts and stalls immediately
Common Causes
- Carbon coking sealing the throttle plate shut
- Ice buildup in throttle body (cold climates)
- Failed throttle body motor
- Damaged throttle plate
How to Fix
- 1 Manually clean the throttle body
- 2 Allow vehicle to thaw in a warm garage
- 3 Replace the electronic throttle body
- 4 Check air filter box for debris
Technical Explanation
The PCM triggers P2112 after its internal monitoring routine detects that a specific circuit or sensor has exceeded its acceptable operating range. The control module samples the circuit continuously during normal operation, using both voltage level monitoring and frequency analysis to detect open circuits, shorts to ground, shorts to battery voltage, and high-resistance connections. After two failed drive cycles, the code transitions from a pending to a confirmed DTC, and the PCM activates the MIL. Clearing the code without repairing the fault will result in re-illumination within one to two complete drive cycles.
Is It Safe to Drive?
With P2112 active, your engine or transmission is not operating within design parameters. Short-term driving may seem fine, but internal damage is accumulating — particularly to carbon coking sealing the throttle plate shut.
Mechanic's Pro Tip
When diagnosing P2112, start with the cheapest and most accessible potential causes first: verify fuses, relay operation, and connector integrity before purchasing any parts. Use a scan tool to capture live data during the fault condition — static readings with the fault absent often yield no useful information. Document the freeze frame data stored with the code; it records the exact engine conditions (RPM, load, coolant temp, fuel trim) at the moment the fault was detected and is invaluable for replicating the fault on a test drive.
Related Fault Codes
Frequently Asked Questions
What does OBD2 code P2112 mean?
OBD2 code P2112 refers to Throttle Actuator Control System - Stuck Closed. Encountering the engine check light code P2112 signifies an explicit mechanical or electrical operational breakdown categorized as "Throttle Actuator Control System - Stuck Closed". Professional scanner tools usually flag this subsystem loop early on.
What are the most common symptoms of DTC P2112?
Drivers experiencing code P2112 typically report: Engine cranks but won't start, or starts and stalls immediately.
Is it safe to drive with trouble code P2112 active?
With P2112 active, your engine or transmission is not operating within design parameters. Short-term driving may seem fine, but internal damage is accumulating — particularly to carbon coking sealing the throttle plate shut.
How much does it cost to fix code P2112?
The estimated repair cost for P2112 ranges from $50 to $600 USD. Throttle body clean: $80; Throttle body replacement: $300 - $600
Throttle body clean: $80; Throttle body replacement: $300 - $600
Need Professional Diagnostic Assistance?
Always verify sensor signals and wiring integrity with an OBD2 scanner before purchasing replacement parts.
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