P2112 — Throttle Actuator Control System - Stuck Closed

P2112 — Throttle Actuator Control System - Stuck Closed. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: dirty throttle body or stuck throttle plate, failed electronic throttle motor, wiring or connector faults in the throttle circuit.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P2112 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the throttle and intake air metering for damage, corrosion, chafing or poor contact.
  4. Subsystem check Command the throttle actuator control system on and off with a scanner and watch the feedback signal; then remove and inspect the mechanism for sticking before replacing it.
  5. Subsystem check Inspect and clean the throttle body; check that the plate moves freely.
  6. Subsystem check Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
  7. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2112 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2112 (parts and labor, USD, independent shop rates): Replace the throttle body assembly: $250–$700; Replace the MAF or MAP sensor: $150–$400; Clean the throttle body: $80–$200. Overall, fixing P2112 usually costs between $80 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How much does it cost to fix P2112?

Replace the throttle body assembly — $250–$700; Replace the MAF or MAP sensor — $150–$400; Clean the throttle body — $80–$200. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Is it safe to drive with P2112?

Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

How do I diagnose P2112 myself?

Start with a scan: confirm P2112, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the throttle actuator control system, and verify the suspect component against live data before buying parts.

Will P2112 clear itself?

Sometimes P2112 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code P2112 mean?

P2112 — Throttle Actuator Control System - Stuck Closed. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: dirty throttle body or stuck throttle plate, failed electronic throttle motor, wiring or connector faults in the throttle circuit.

What does P2112 mean?

When P2112 appears on a scan, it means the control module has flagged a problem in the throttle and intake air metering: throttle actuator control system - stuck closed. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

“Stuck” means the throttle actuator control system is commanded to change state but feedback shows it does not move — or moves when it should not. Typical physical reasons are carbon or dirt jamming the mechanism, welded relay contacts, or a weak actuator.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2112 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2112?

  • mechanism of the throttle actuator control system jammed by carbon, dirt or corrosion
  • weak actuator motor or broken spring
  • welded relay contacts keeping the circuit permanently on
  • contaminated or failed MAF/MAP sensor
  • wiring or connector faults in the throttle circuit
  • intake air leaks after the MAF sensor
  • dirty throttle body or stuck throttle plate

Common symptoms of P2112

  • unstable or high idle
  • poor throttle response
  • stalling when coming to a stop
  • Check Engine Light on
  • limp-home mode with reduced power

How to diagnose P2112

  1. Connect an OBD2 scanner, confirm P2112 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the throttle and intake air metering for damage, corrosion, chafing or poor contact.
  4. Command the throttle actuator control system on and off with a scanner and watch the feedback signal; then remove and inspect the mechanism for sticking before replacing it.
  5. Inspect and clean the throttle body; check that the plate moves freely.
  6. Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
  7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2112 does not return.

How to fix P2112

Start with the cheapest and most common causes before replacing expensive parts:

  • Replace the throttle body assembly — $250–$700
  • Replace the MAF or MAP sensor — $150–$400
  • Clean the throttle body — $80–$200

How much does it cost to fix P2112?

Repair cost depends on which component actually failed. Typical scenarios for P2112 (parts and labor, USD, independent shop rates):

  • Replace the throttle body assembly: $250–$700
  • Replace the MAF or MAP sensor: $150–$400
  • Clean the throttle body: $80–$200

Overall, fixing P2112 usually costs between $80 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2112?

Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

Related OBD2 codes