OBD-II Code P2100: Throttle Actuator Control Motor Circuit/Open

What Does P2100 Mean?

P2100 signifies the Powertrain Control Module (PCM) detected a complete electrical disconnection in the throttle actuator control (TAC) motor circuit. Modern cars use a 'drive-by-wire' system where the gas pedal sends an electronic signal to the PCM, which commands a motor to operate the throttle plate. This code indicates an 'open'—a broken wire, unplugged connector, or burnt motor—preventing the PCM from controlling engine airflow.

Technical definition: The SAE/OBD-II definition is "Throttle Actuator 'A' Control Motor Circuit/Open." The PCM uses a duty cycle to command the throttle plate's position. An open circuit means zero current is flowing, making execution impossible. The PCM instantly enters a fail-safe limp mode and illuminates the Check Engine Light.

Can I Drive With P2100?

No — Do Not Drive. Driving is unsafe. This code instantly triggers a fail-safe "limp mode," severely limiting engine power to 5-30 mph, or prevents the engine from revving above idle entirely. A sudden loss of acceleration in traffic poses a severe collision risk. Tow the vehicle to a safe location for immediate diagnosis.

Common Causes

• Damaged, Frayed, or Corroded Wiring/Connectors (Very Common) — The wiring harness to the throttle body endures intense engine heat and vibration, causing wires to break or melt. Moisture intrusion from pressure washing or road salt corrodes connector pins, completely interrupting the electrical signal.
• Faulty Throttle Actuator Control (TAC) Motor (Common) — The electric motor inside the throttle body assembly fails internally. Stripped plastic gears or a burnt-out motor winding create the physical open circuit detected by the PCM.
• Blown Fuse or Faulty Throttle Control Relay (Common) — A dedicated fuse and relay protect the Electronic Throttle Control System (ETCS). A power surge or short circuit blows the fuse, completely cutting power to the circuit and triggering P2100.
• Faulty Powertrain Control Module (PCM) or Software Glitch (Less Common) — Specific vehicles (like 2021-2022 Jeep Wranglers) suffer from PCM software glitches that erroneously set P2100, requiring a dealer update. True PCM hardware failure is rare and triggers multiple unrelated codes.
• Poor Ground Connection (Less Common) — A corroded or broken ground strap for the electronic throttle system creates high electrical resistance. The PCM interprets this lack of a solid ground as an open control circuit.
• Weak or Failing Battery (Rare) — A dying battery creates widespread low-voltage conditions. This unstable power supply forces the sensitive throttle control module to register a false open circuit fault.
🎬 See this quick breakdown of common P2100 engine error causes.

Symptoms

• Engine is in "Limp Mode" — The vehicle drastically reduces power and refuses to accelerate past 5-30 mph. Some manufacturers display a flashing red lightning bolt icon on the dashboard to indicate a critical throttle fault.
• No Throttle Response — Pressing the accelerator pedal does nothing. The engine idles but refuses to rev, rendering the vehicle undrivable.
• Check Engine Light is On — A solid or flashing Malfunction Indicator Lamp illuminates immediately upon fault detection.
• Engine Stalling or Rough Idle — The engine stalls unexpectedly at low speeds or idles erratically because the PCM cannot manage intake airflow.
• Vehicle Will Not Start — The PCM prevents engine ignition entirely if it cannot verify a safely closed throttle position.
• Abnormal Throttle Body Noises — A buzzing or repeated clicking sound from the throttle body with the ignition on indicates stripped internal motor gears.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this code.

Common Fixes & Costs

• Replacing the Throttle Body Assembly — Parts: $200-$600, Labor: $100-$250, ~1.2 hr book time (Intermediate)
  Jeep Wrangler (JL) / Gladiator (JT) 3.6L: OEM Mopar 05184349AC (Alt: OMIX 17224.52, Standard Motor Products S20220)
  Ford Escape (2.5L): OEM Ford DS7Z-9E926-D (Alt: Dorman 977-300, Hitachi ETB0033)
  Chevrolet Equinox (2.4L): OEM ACDelco 12670839 (Alt: Dorman 977-107, Hitachi ETB0070)
• Repairing Damaged Wiring or Connectors — Parts: $10-$50, Labor: $100-$300, ~1.5 hr book time (Intermediate)
• Updating PCM Software at Dealership — Parts: $0, Labor: $100-$200, ~1 hr book time (Professional)
• Replacing a Blown Fuse or Relay — Parts: $5-$30, Labor: $0, ~0.1 hr book time (DIY)
• Replacing the Powertrain Control Module (PCM) — Parts: $600-$1500, Labor: $150-$300, ~1.5 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: A used throttle body from a low-mileage donor vehicle is cost-effective for older cars (>150k miles) on a tight budget.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Verify the donor vehicle was not scrapped for engine or electrical fires.
• Match the part number exactly; superseded numbers fail to communicate with the PCM.
• Inspect the connector pins for green corrosion before purchasing.

Decision logic:

• If Vehicle has under 80k miles → Buy a new OEM part to ensure longevity and avoid repeat labor costs.
• If Vehicle has over 150k miles and the new part costs 20% of the car's value → Buy a warrantied used part, accepting its lifespan is uncertain.
• If The specific part has a known high failure rate (e.g., BMW throttle actuators) → Buy a new part with an updated, revised design.

Warranty tradeoff: Used parts offer a 30-90 day warranty. New aftermarket parts offer 1-year to lifetime warranties. New OEM parts carry a 1-year warranty.

Worst-case if a used part fails: $300-$800 (Cost of another replacement part plus repeat labor)

What Happens If You Wait — Timeline

1. Immediate: Code P2100 sets. The Check Engine Light illuminates. The vehicle instantly enters limp mode, severely limiting RPM and speed, or loses all throttle response. (MPG impact: N/A (Vehicle is undrivable)% · Added cost: $100-$300 (Towing))
2. 0-1 week of ignoring/resetting: Attempting to drive in limp mode is hazardous. Restarting the car temporarily clears the limp mode, but the hard fault remains, guaranteeing a sudden loss of power in traffic. (MPG impact: 15% (Efficiency is destroyed in limp mode)% · Added cost: $50 (Wasted fuel))
3. 1-4 weeks of ignoring/resetting: If the root cause is a short circuit, continued operation sends erratic voltage back to the Powertrain Control Module (PCM), permanently destroying the delicate driver circuits inside the computer. (MPG impact: N/A% · Added cost: $800-$2000 (Cost of a new PCM))
4. 1+ month: The vehicle is a paperweight. The initial fault remains, and secondary damage to the PCM from repeated electrical shorts is highly likely. (MPG impact: N/A% · Added cost: $1500+ (Original repair + PCM replacement))

Cost of Not Fixing It

• Immediate: Vehicle is undrivable or enters a severe 5-30 mph 'limp mode,' posing a significant collision hazard. (Added cost: $100-$300 (Towing))
• 0-1 month: Ignoring the fault causes persistent stalling, rough running, and a no-start condition. Fuel economy plummets. (Added cost: $50-$100 (Wasted fuel))
• 1-6 months: Erratic voltage from a shorted circuit permanently destroys the driver circuits inside the Powertrain Control Module (PCM). (Added cost: $800-$2000 (PCM replacement))

Diagnosis Steps

1. Check for Technical Service Bulletins (TSBs)
   Search for TSBs related to P2100 for your specific VIN. Manufacturers like Jeep issue TSBs identifying software glitches as the root cause, requiring a PCM reflash rather than hardware replacement.
   Tools: Internet access, Vehicle Identification Number (VIN) (Beginner)
2. Inspect the ETCS Fuse and Relay
   Locate the Electronic Throttle Control System (ETCS) fuse in the engine bay. Inspect the filament for a break. Swap the ETCS relay with an identical known-good relay (like the horn relay) to rule out a relay failure.
   Tools: Owner's manual, fuse puller or needle-nose pliers (Beginner)
3. Visually Inspect Wiring and Connectors
   Thoroughly inspect the wiring harness leading to the throttle body. Look for frayed wires, melted insulation, or harness rub-through. Unplug the connector and check for green corrosion, bent pins, and moisture.
   Tools: Flashlight (Beginner)
4. Test the Throttle Actuator Motor Resistance
   With the throttle body disconnected, measure the resistance between the two motor pins. A typical specification is 0.3 to 100 ohms. A reading of infinite resistance ('OL') confirms the motor has an internal open circuit and requires replacement.
   Tools: Digital Multimeter (DVOM), vehicle-specific repair manual (Advanced)
5. Perform Bi-Directional Control Test (Pro Tip)
   Use a high-end scan tool to command the throttle actuator motor to open to 25% and 50%. If the throttle does not respond, but wiring and power are confirmed good, the throttle body is dead.
   Tools: Bi-directional OBD-II Scan Tool (Professional)
6. Test the Circuit for Power and Ground
   With the ignition on (engine off), check for power and ground at the throttle actuator connector. One pin requires a 5-volt reference (Vref) from the PCM, and another requires a solid ground (less than 0.1 volts). Lack of either indicates a wiring break.
   Tools: Digital Multimeter (DVOM), vehicle-specific wiring diagram (Intermediate)
7. Check Circuit Continuity
   Disconnect the connectors at the throttle body and the PCM. Check for continuity on the two motor control wires between both ends. An 'OL' reading indicates a broken wire hidden inside the harness.
   Tools: Digital Multimeter (DVOM), vehicle-specific wiring diagram (Advanced)
8. Analyze Live Sensor Data
   View live data streams for Commanded Throttle Position and the two Throttle Position Sensors (TP1 and TP2). The voltages for TP1 and TP2 must move smoothly in opposite directions. Non-responsive data confirms an internal failure.
   Tools: Professional OBD-II Scan Tool (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Engine Coolant Temp: 180-210°F (Fully warmed up during normal operation.)
• RPM: 700-2500 RPM (Occurs at idle, during light acceleration, or at a steady cruise.)
• Engine Load: 15-50% (Triggers under any load condition, as it is a pure electrical circuit failure.)
• Vehicle Speed: 0-65 mph (Occurs instantly at any speed when the PCM detects the broken circuit.)

Related Codes

• P2101 — Throttle Actuator 'A' Control Motor Circuit Range/Performance. The throttle actuator is stuck or slow. P2100 is an electrical open circuit; P2101 is a mechanical fault.
• P2102 — Throttle Actuator 'A' Control Motor Circuit Low. Indicates a short to ground in the control circuit. P2100 indicates a complete break in the circuit.
• P2103 — Throttle Actuator 'A' Control Motor Circuit High. Points to a short to power in the circuit. P2100 signifies a total lack of connection.
• P2110 — Throttle Actuator Control System - Forced Limited RPM. Accompanies P2100 to indicate the PCM actively limited engine RPM as a fail-safe action.
• P2111 / P2112 — Throttle Actuator Control System - Stuck Open / Stuck Closed. Indicates a mechanical failure where the throttle plate is physically jammed by carbon or broken gears.
• P2135 — Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation. Indicates a disagreement between the two internal throttle position sensors, leading to limp mode.

Climate & Environmental Factors

• Cold Weather: Moisture in the intake system freezes the throttle plate in sub-freezing temperatures (around 23°F / -5°C), causing the motor to strain and trigger P2100. This requires a PCM software update to adjust cold-weather motor behavior.
• High Humidity / Road Salt: Heavy use of road salt accelerates corrosion on wiring harnesses and connector pins. This corrosion creates a complete open in the circuit, directly triggering P2100.

How to Talk to a Mechanic About This Code

Say this: "I have a P2100 code causing a limp mode condition. Please start by checking for TSBs, inspecting the ETCS fuse, and testing the wiring harness for an open circuit before quoting a new throttle body."

This directs the technician to follow a logical diagnostic path instead of immediately replacing the $500 throttle body, saving you hundreds of dollars on misdiagnosis.

Avoid saying:

• 'My car won't accelerate, just fix it.'
• 'My check engine light is on, can you look at it?'
• 'I think I need a new throttle body.'

Questions to ask before authorizing the repair:

• Did you find a relevant Technical Service Bulletin (TSB) for my vehicle?
• Was the ETCS fuse blown or the relay faulty?
• Did you perform a continuity test on the wiring harness? Was an open circuit found?
• If recommending a throttle body, did the old one fail a resistance or bi-directional test?
• Does the quoted price include the mandatory throttle relearn procedure?
• What is the warranty on the parts and labor?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: Recommended if a software update (TSB) is the likely cause or if the vehicle is under warranty.
  Best for: Vehicles under warranty., Newer Jeep, Chrysler, or GM models known to have software-related TSBs for P2100., Complex European brands like BMW or VW.
  Downsides: Highest labor rates., Defaults to expensive part replacement instead of nuanced wiring repairs. (Typical cost: +50% vs. baseline)
• Independent Shop: Best overall fit for out-of-warranty vehicles, provided you choose a shop with strong electrical diagnostic capabilities. Verify they can perform a throttle relearn.
  Best for: Out-of-warranty vehicles where cost is a major factor., Diagnosing and repairing common wiring or connector failures.
  Downsides: Shop quality varies. Ensure they have bi-directional diagnostic tools., Lacks access to the latest manufacturer software flashing equipment. (Typical cost: +0% vs. baseline)
• Chain Shop: AVOID for diagnosing P2100. The risk of incorrect diagnosis and unnecessary parts replacement is high.
  Best for: Simple jobs like battery or fuse replacement.
  Downsides: Technician skill is highly variable., Lacks the advanced diagnostic tools required for complex electrical faults., High pressure to sell parts leads to misdiagnosis. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost for P2100 exceeds 40-50% of your car's private-party value, reconsider the repair. For cars over 150,000 miles, this threshold drops to 30%.

• Car worth $4000, fix is $800: Fix it. The repair cost is 20% of the car's value.
• Car worth $3000, fix is $1500: Borderline. This is 50% of the car's value. Get a second opinion to confirm the diagnosis before proceeding.
• Car worth $2000, fix is $1500: Walk away. The repair cost is 75% of the vehicle's value. It is not economically sensible.

What Scan Tool You Need for This Code

Minimum: A scanner that reads live data streams for throttle position sensors (TPS) and performs bi-directional controls. A basic $20 code reader is useless for this repair.

Basic readers only display the P2100 code. They cannot show live data to verify wiring, nor can they perform the mandatory 'Throttle Relearn' procedure required after installing a new throttle body.

Budget: BlueDriver Pro Scan Tool (~$100) — Connects to your smartphone via Bluetooth. It reads P2100, provides freeze frame data, and streams live TPS voltages to diagnose wiring. It does NOT perform the throttle relearn procedure.

Mid-range: Foxwell NT510 Elite / XTOOL D7 (~$150) — Offers live data plus crucial bi-directional control. This allows you to command the throttle plate to open and perform the mandatory 'Throttle Relearn' function after a new throttle body is installed.

Professional: Autel MaxiCOM MK808 / MK906BT (~$500-1200) — Provides full bi-directional control, OEM-level diagnostics, and performs throttle relearns on all vehicles. Ideal for diagnosing complex electrical issues triggering P2100.

Rent vs buy: Auto parts stores read codes for free, but their tools cannot perform a throttle relearn. If replacing the throttle body yourself, you MUST buy a mid-range scanner with relearn capabilities.

How to Clear the Code After You Fix It

1. Reconnect battery (if disconnected for repair)
2. Use an OBD-II scan tool to clear the P2100 code and perform the mandatory Throttle Relearn procedure
3. Perform a complete OBD-II drive cycle to allow readiness monitors to run

Drive cycle (~20 minutes): 1) Cold start, idle for 3 minutes with A/C on. 2) Drive in city traffic (25-40 mph) with several stops. 3) Accelerate to highway speed (55-60 mph) and maintain for 5 minutes. 4) Coast down without braking. 5) Repeat if monitors are not set.

Readiness monitors affected: Catalyst Monitor, Oxygen (O2) Sensor Monitor, EVAP System Monitor, Comprehensive Component Monitor

Before emissions retest: drive at least 50 miles to fully set monitors.

Watch out for:

• Clearing the code does not fix the underlying electrical open; the code returns instantly if the repair failed.
• Disconnecting the battery resets all readiness monitors, requiring a full drive cycle before an emissions test.
• Failing to perform the Throttle Relearn procedure before driving causes immediate stalling and sets new codes.

Will This Fail Emissions / State Inspection?

Yes — this code typically fails an OBD-II emissions inspection.

• California: An active Check Engine Light results in an automatic smog check failure. All readiness monitors (except EVAP) must be 'Ready' to pass.
• New York: The NYS DMV inspection includes an OBD-II scan. An illuminated Malfunction Indicator Lamp for P2100 causes an automatic failure.
• Texas: In the 17 counties requiring emissions testing, an active P2100 code fails the OBD portion of the state inspection.

Most Commonly Affected Vehicles

• Jeep Wrangler (JL), Gladiator (JT) (2021-2022) — A software glitch is the primary cause. TSB #18-071-22 Rev. C mandates a PCM software update before replacing any hardware. TSB #09-003-20 REV. C covers 2020 models for defective throttle body batches.
• Ford Escape (2.5L) (2008-2016) — Highly prone to frayed wiring in the harness near the battery area, leading to an open circuit. Covered by extended warranty program 13N03 for 10 years/150,000 miles on 2009-2013 models.
• Chevrolet Equinox (2.4L) (2010-2017) — Caused by shorted circuit wiring or requires an ECM software update to fix intermittent glitches. Throttle body replacement is also frequent (ACDelco 12670839).
• Volkswagen Passat, Jetta, Tiguan (TDI & 2.0T) (2009-2015) — Extremely common on 2.0L TDI engines, pointing directly to a failed throttle actuator motor within the throttle body assembly due to oil intrusion.
• BMW M3 (E90, E92, E93) (2008-2013) — The S65 V8 engine uses two throttle actuators. Failure of one triggers P2100 or 2B15. Replace both actuators simultaneously, as the second unit fails shortly after.
• Toyota RAV4 (2.5L) (2013-2020) — Typically linked to a faulty throttle actuator control module or severe corrosion in the electrical connectors.
• Nissan Versa, Navara, Urvan (2007-2012) — Caused by a faulty throttle control relay or loose pins in the ECU connector. Checking the relay is the mandatory first diagnostic step.
• Kia/Hyundai Optima, Sorento, Sonata (2011-2016) — Related to a faulty throttle body assembly or wiring breaks between the throttle body and the engine computer.
• Honda Civic, CR-V (2006-2011) — Honda vehicles more commonly set P2101 (Performance) for throttle issues, but P2100 occurs when the wiring harness is physically severed.

Manufacturer-Specific Notes

• Jeep/Chrysler/Dodge: For 2021-2022 models, TSB #18-071-22 Rev. C states P2100 is caused by a software glitch. Reprogram the PCM before replacing parts. A flashing red lightning bolt on the dash confirms this fault.
• Ford: Frequently caused by frayed wiring in the harness routed near the battery. Ford issued Customer Satisfaction Program 13N03, extending the throttle body warranty to 10 years/150,000 miles for 2009-2013 models.
• Chevrolet/GM: Triggered by a software anomaly in the Engine Control Module (ECM). Checking for software updates is the required early step.
• BMW: On V-engines (like the S65 V8) using dual throttle actuators, replace both actuators if one fails. The second unit is guaranteed to fail soon after.
• Volkswagen: On 2.0L TDI engines, P2100 points directly to an internal failure of the throttle actuator motor due to oil intrusion, requiring immediate throttle body replacement.
• Mitsubishi: For the 2010-2012 Outlander, TSB-13-13-005 notes P2100 sets in freezing weather due to throttle plate icing. The fix is a dealer ECM software update.

Real Owner Stories

2022 Jeep Gladiator Rubicon with 273 miles

While passing another car, the driver hit a rumble strip. The truck immediately went into limp mode with a flashing red throttle light and set code P2100.

What they tried:

1. The owner towed the vehicle directly to the dealership, suspecting a warranty issue due to the low mileage.

Outcome: The dealer performed a PCM software update mandated by Technical Service Bulletin (TSB) #18-071-22 Rev. C. This completely resolved the issue without replacing any hardware.

Lesson: For modern Jeeps, a software glitch is the primary suspect for P2100. Always check for TSBs before authorizing hardware replacement.

2005 Ford Focus with intermittent P2100

The car randomly entered limp mode, displaying code P2100. The issue was unpredictable.

What they tried:

1. A shop installed a new throttle body, but the problem persisted.
2. The owner purchased a reconditioned ECU and had the data cloned to it.

Outcome: Even with a new throttle body and ECU, the problem remained. The final diagnosis revealed a broken wire inside the harness, a known Ford issue. A simple 'wiggle test' on the wiring loom would have identified the open circuit immediately.

Lesson: Never replace expensive components without exhaustively checking the wiring. An 'open circuit' code usually means a broken wire, which costs pennies to fix compared to a $500 throttle body.

2005 Audi A6 2.0 TDI with P2100

The Check Engine Light illuminated, and a scan revealed P2100. The owner found the throttle body housing full of oil.

What they tried:

1. The owner cleaned the oil out of the assembly and reinstalled it, but the code returned instantly.
2. The owner checked the engine bay fuse box.

Outcome: The internal motor failed due to oil contamination. The owner replaced the throttle body and found the associated 10A fuse (Fuse #24) blown. Replacing both fixed the issue.

Lesson: On VW/Audi TDI engines, P2100 almost always indicates a destroyed throttle actuator motor. Always check the associated ETCS fuse after replacing the unit.

How to Prevent This Code From Triggering

• Protect the Throttle Body Wiring Harness (Once, or during any engine work) — The wiring harness near the engine fails frequently due to heat. Wrap the loom with high-temperature resistant tape or a fiberglass sleeve to prevent wires from becoming brittle and breaking.
• Apply Dielectric Grease to Connectors (During any related repair or inspection) — Applying dielectric grease to the throttle body connector seal blocks moisture intrusion, preventing the pin corrosion that causes open circuits.
• Ensure Safe Engine Bay Cleaning (As needed) — Aggressive pressure washing forces water into sealed electrical connectors. Use low pressure, cover the PCM and throttle body connector with plastic bags, and allow ample drying time.
• Do Not Manually Force the Throttle Plate (Always) — Manually forcing a drive-by-wire throttle plate open strips the delicate internal plastic gears, causing immediate failure and triggering P2100.

Frequently Asked Questions

How much does it cost to fix code P2100?

Costs vary by cause: a fuse is under $20, wiring repairs average $150-$350, and a full throttle body replacement runs $300-$850. A dealership software update typically costs $150-$200.

Can I fix P2100 myself?

DIYers can safely inspect fuses, relays, and wiring. However, replacing the throttle body requires a professional scan tool to perform a mandatory 'relearn' procedure. Skipping this calibration causes erratic idling and persistent codes.

What are the most common mistakes when diagnosing P2100?

The biggest mistake is replacing the $400+ throttle body without checking for TSBs, blown fuses, or broken wires first. Never manually force the throttle plate open, as this strips the internal plastic gears and destroys the unit.

Can a bad battery cause a P2100 code?

Yes, indirectly. A failing battery causes widespread low voltage, forcing sensitive electronic modules like the throttle controller to malfunction. Test your battery and alternator if starting issues accompany the P2100 code.

Does P2100 affect diesel vehicles?

Yes. Modern diesels use an electronic intake air throttle valve to control airflow for EGR and DPF emissions systems. A P2100 code on a diesel indicates an identical electrical open circuit in this valve's motor.

Will clearing the code fix the problem?

No. Clearing the code only erases the fault from memory temporarily. Because P2100 is a hard electrical fault, the PCM detects the open circuit immediately on startup and triggers the limp mode again.

Can a dirty throttle body cause a P2100 code?

No. A dirty throttle body causes mechanical sticking, which triggers performance codes like P2101. It does not cause the complete electrical open circuit required to set P2100.

Will P2100 cause my car to fail an emissions test?

Yes. An active Check Engine Light is an automatic failure for any state emissions inspection. You must repair the underlying open circuit and complete a drive cycle before testing.

What should I do if the P2100 code returns after a repair?

A returning code means the initial diagnosis missed the root cause, such as replacing the throttle body when the actual fault was a broken wire. Re-diagnose the circuit by performing a 'wiggle test' on the harness to find the hidden break.

Is a throttle body 'relearn' procedure always necessary?

Yes, for almost all modern vehicles. The PCM must learn the new throttle body's closed position and full range of motion using a bi-directional scan tool. Skipping this causes high idling, stalling, and immediate return of throttle codes.

Key Takeaways

• P2100 indicates a complete electrical break in the throttle actuator circuit, immediately disabling normal acceleration.
• Driving is unsafe; the vehicle instantly enters a 5-30 mph limp mode or loses throttle response entirely, requiring a tow.
• Check the 10A ETCS fuse and search for manufacturer Technical Service Bulletins (TSBs) before spending $400+ on a new throttle body.
• Replacing the throttle body requires a digital 'relearn' procedure using a bi-directional scan tool to synchronize the new motor with the PCM.