P2112 on 2010-2019 Ford Taurus 3.5L: Throttle Body Stuck Closed Causes and Fixes

What's Unique About the 2010-2019 Ford Taurus

The sixth-generation Taurus with the 3.5L V6 is part of a large family of Ford vehicles from this era known for a high rate of electronic throttle body (ETB) failures. The issue was so widespread that Ford issued Technical Service Bulletin (TSB) 10-21-6 and Customer Satisfaction Program 13N03. The failure is typically not due to dirt or carbon buildup but an internal electronic fault within the throttle body assembly, specifically contamination on the internal motor contacts, which makes cleaning ineffective and replacement the only viable solution.

Symptoms You May Notice

• Sudden and severe loss of engine power (entering 'limp mode')
• Wrench warning light illuminated on the dashboard
• Check Engine Light is on
• Unresponsive or delayed accelerator pedal
• Rough, unstable, or low idle
• Engine may stall when coming to a stop
• Vehicle fails to start (in severe cases where the throttle cannot open at all)

Most Likely Causes

1. Failed Electronic Throttle Body (ETB) Assembly 🔴 High Probability → Shop Fuel Injection Throttle Body This is a well-documented, widespread issue on many Ford vehicles from this period due to an internal electronic fault. Ford's own documents cite contamination on the throttle motor's internal electrical contacts, causing intermittent connectivity.
   How to confirm: The presence of code P2112 (or its companion P2111) combined with the vehicle entering 'limp mode' is a very strong indicator. A scan tool can monitor commanded vs. actual throttle position to confirm the discrepancy. Given the high failure rate, this is the presumptive cause.
   Typical fix: Replace the entire electronic throttle body assembly. Cleaning the old unit will not fix this internal electronic fault.
   Est. part cost: $80-$250
2. Wiring or Connector Issue ⚪ Low Probability General wear and tear, vibration, or improper servicing can lead to chafed wires or loose pins at the throttle body connector. However, this is far less common than the ETB failure itself.
   How to confirm: Visually inspect the wiring harness and connector at the throttle body for any signs of damage, corrosion, or loose pins. Use a multimeter to check for proper voltage and ground at the connector according to the vehicle's wiring diagram.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the connector.
   Est. part cost: $10-$100

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is very uncommon. Before condemning the PCM, all other possibilities, especially the throttle body and its wiring, must be exhaustively ruled out. In some rare cases, a faulty driver circuit within the PCM can mimic a failed throttle body.

Diagnosis Steps

1. Use an OBD-II scanner to confirm P2112 is the primary code. Check for other related codes like P2111 or P2104.
2. Visually inspect the electrical connector and wiring harness leading to the electronic throttle body. Look for any chafing, corrosion, or loose pins.
3. If wiring appears intact, the most probable cause is the throttle body itself. Given the extremely high failure rate on this platform, replacement is the most common and effective diagnostic step.
4. After replacing the throttle body, clear the codes and perform the throttle body relearn procedure. This can often be done without a scan tool by turning the ignition to 'ON' (engine off) for a few minutes to allow the PCM to find the new closed position, then starting the engine and letting it idle for several minutes to learn the idle trim.
5. A more robust non-scanner relearn procedure is: 1. Turn ignition ON (engine off) for 2 minutes. 2. Turn ignition OFF for 1 minute. 3. Start the engine and let it idle for 5 minutes in Park. 4. Drive the vehicle to allow the PCM to learn shift strategies.
6. If the problem persists after replacing the throttle body, perform a detailed circuit check with a multimeter to verify power, ground, and signal integrity between the PCM and the throttle body. If the wiring is confirmed to be good, a PCM fault may be considered, though this is rare.

Parts You'll Likely Need

• Electronic Throttle Body Assembly (OEM #AA5Z-9E926-A (Superseded by TB-12)) — This is the component that almost always fails, causing the P2112 code due to a known internal electronic defect. The original part number has been superseded.
  Trusted brands: Motorcraft, Bosch, Hitachi, Dorman
  OEM price range: $200-$350
  Aftermarket price range: $80-$200

Related Codes That Often Appear With This One

• P2111 — This is the companion code for 'Throttle Actuator Control System - Stuck Open.' Both codes point to the same root cause: a failing electronic throttle body assembly and are often listed together in Ford's TSBs.
• P2104 — This code for 'Throttle Actuator Control System - Forced Idle' is a status code indicating the PCM has put the vehicle into limp mode as a direct result of detecting the fault that triggered P2111 or P2112.

Technical Service Bulletins (TSBs) & Recalls

• TSB 10-21-6: Addresses DTCs P2111 and P2112 on 2010-2011 Taurus 3.5L models, recommending throttle body replacement for certain build dates.
• Customer Satisfaction Program 13N03: Extended warranty coverage for the ETB to 10 years/150,000 miles, confirming the widespread nature of the defect.

Platform-Specific Known Issues

• Ford issued TSB 10-21-6 for 2010-2011 Taurus models with the 3.5L engine (built from 3/1/2010 to 8/3/2010) that experienced codes P2111 or P2112, recommending throttle body replacement.
• Ford also initiated Customer Satisfaction Program 13N03, which extended the warranty on the electronic throttle body to 10 years or 150,000 miles for many affected models due to the high failure rate. This program has expired for all eligible vehicles.
• The official cause stated by Ford for the warranty extension was contamination on the internal motor contacts of the throttle body, leading to intermittent electrical connectivity.

Mechanic-Grade Diagnostic Values

• Throttle Actuator Control (TAC) Motor Coil Resistance — expected: 2 to 15 Ohms. Failure: A reading of less than 1 Ohm indicates a short, while an Over Limit (OL) reading indicates an open circuit.
• Throttle Position Sensor (TPS) Supply Voltage — expected: Approximately 5V (Reference Voltage - VREF). Failure: Significantly lower or no voltage indicates a wiring or PCM issue.
• Throttle Actuator Supply Voltage — expected: 11-13 Volts with ignition on. Failure: Voltage outside this range suggests a problem with the power supply circuit or PCM.
• Live Data: Commanded vs. Actual Throttle Angle — expected: Values should track each other closely.. Failure: When P2112 is set, the actual throttle angle will be more than 6 degrees lower than the commanded angle.

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System): Clear KAM (Keep Alive Memory) / Reset All Adaptations — This function should be performed after replacing the electronic throttle body to clear the old learned values and force the PCM to relearn the new throttle body's idle and range of motion.
• Ford IDS (Integrated Diagnostic System): Datalogger with Trigger — To diagnose an intermittent P2112, a technician can set up the datalogger to automatically record sensor data (like commanded vs. actual throttle position) the moment the DTC is triggered, capturing the fault event.

Wiring & Ground Locations

• C175B — The largest of the three main connectors at the Powertrain Control Module (PCM), located in the engine bay near the firewall.. This connector contains the circuits for the throttle actuator control motor and the throttle position sensors. A poor connection or corrosion here can directly cause P2112.
• G103 / G104 — Major chassis ground points located in the engine bay, typically on or near the driver's side frame rail or inner fender/strut tower.. These are primary ground points for the PCM and various engine sensors. A loose or corroded connection at these grounds can cause erratic sensor readings and communication faults, potentially mimicking a throttle body failure.

Real Owner Repair Stories

• Ford F150 Forum user 'co_heil_F150' (2016 Ford F-150 3.5L EcoBoost (platform mate with same engine/ETB) at 48,000 miles) — Sudden loss of power, would only 'idle' forward, check engine light came on. Occurred while pulling into traffic.
  ❌ Tried (didn't work) The user went straight to diagnosis and replacement.
  ✅ What actually fixed it Scanned the code, which returned P2112. The user replaced the entire throttle body and electronic actuator unit, which resolved the issue. They noted that a new gasket was also required.

OEM Part Supersession History

• AA5Z-9E926-A → AA5Z-9E926-B — The original part was prone to internal electronic failure. The supersession is likely an updated design to improve reliability.
  Heads up: The new part number AA5Z-9E926-B is a direct replacement for the original. Some sources also refer to it as TB12.

Model Year Variations Within This Range

• 2010-2012 vs 2013-2019: The Ford Taurus received a major facelift for the 2013 model year. While the 3.5L engine and the fundamental throttle body issue remained, some wiring harness routing and connector locations may differ slightly between pre-facelift (2010-2012) and post-facelift (2013-2019) models. However, the diagnostic approach for P2112 remains the same.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Internal Water Pump Failure 🔴 High — Common after 80,000 miles. Failure is often catastrophic as the timing-chain-driven pump leaks coolant directly into the engine oil, destroying the engine.
• Power Transfer Unit (PTU) Failure (AWD Models) 🔴 High — Commonly occurs from 60,000-100,000 miles. The unit is located near the hot catalytic converter, causing the fluid to break down. It has no drain plug, making service difficult and often neglected, leading to bearing failure.
• Transmission Shifting Issues / Failure 🟠 Medium — More common on earlier 2010-2013 models, but can affect all years. Symptoms include hard shifts, slipping, or complete failure.
• MyFord Touch / SYNC System Glitches 🟡 Low — Very common on 2010-2015 models. Symptoms include a frozen or black screen, unresponsiveness to touch, and random reboots. Often requires software updates or module replacement.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, a used part from a junkyard is NEVER a smart choice. The failure is due to an internal design flaw and wear on electrical contacts, not external damage. A used part has a very high likelihood of having the same defect or developing it shortly after installation.

What to inspect on the donor part:

• Not applicable, as used parts are not recommended.

OEM-only on this vehicle (don't cheap out):

• While not strictly 'OEM-only', using a new Motorcraft (Ford's OEM brand) throttle body is the most reliable option with the highest chance of a long-term fix.

Aftermarket brands forum-validated for this vehicle:

• Bosch
• Hitachi

Brands owners have reported issues with on this vehicle:

• While brands like Dorman offer a more affordable option, some professional technicians and forum users express a preference for OEM/Motorcraft for this critical part due to the nature of the original failure. Cheaper, unbranded parts from online marketplaces carry a significant risk of premature failure.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P2111 — A companion code often seen with P2112; while P2112 indicates the throttle is stuck closed, P2111 indicates it is stuck open, both resulting from the same internal ETB motor contact failure.
• P2104 — A related code mentioned in diagnostic steps that indicates the Throttle Actuator Control system has forced a 'Limited RPM' or 'Limp Mode' state.
• P2110 — Often associated with throttle actuator control system failures that force the engine into a limited power mode to prevent damage.
• P2107 — Related to the Throttle Actuator Control (TAC) module processor, which may be flagged during the internal electronic failures described in Ford's TSBs.

Frequently Asked Questions