P2102 — Throttle Actuator "A" Control Motor Circuit Low

OBD2 code P2102 flags a problem with the throttle and intake air metering (throttle actuator "A" control motor circuit low). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, dirty throttle body or stuck throttle plate, 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 P2102 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 Check for supply voltage at the throttle actuator "A" control motor connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
  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 P2102 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2102 (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 P2102 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

Is it safe to drive with P2102?

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.

What does OBD2 code P2102 mean?

OBD2 code P2102 flags a problem with the throttle and intake air metering (throttle actuator "A" control motor circuit low). Short, gentle driving to a shop is usually possible. Common culprits: failed electronic throttle motor, dirty throttle body or stuck throttle plate, wiring or connector faults in the throttle circuit.

What are the symptoms of P2102?

Drivers most often notice: stalling when coming to a stop, limp-home mode with reduced power, poor throttle response, Check Engine Light on.

How much does it cost to fix P2102?

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.

Will P2102 clear itself?

Sometimes P2102 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 P2102 mean?

When P2102 appears on a scan, it means the control module has flagged a problem in the throttle and intake air metering: throttle actuator "A" control motor circuit low. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

“Circuit low” means the voltage on the throttle actuator "A" control motor circuit stays below the expected minimum — close to ground. The usual physical reasons are a short to ground, a chafed wire touching metal, a missing supply voltage, or a failed component dragging the signal down.

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 P2102 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2102?

  • failed throttle actuator "A" control motor pulling the signal low
  • missing supply voltage to the throttle actuator "A" control motor
  • signal wire shorted to ground (chafed insulation)
  • contaminated or failed MAF/MAP sensor
  • intake air leaks after the MAF sensor
  • dirty throttle body or stuck throttle plate
  • failed electronic throttle motor

Common symptoms of P2102

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

How to diagnose P2102

  1. Connect an OBD2 scanner, confirm P2102 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. Check for supply voltage at the throttle actuator "A" control motor connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
  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 P2102 does not return.

How to fix P2102

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 P2102?

Repair cost depends on which component actually failed. Typical scenarios for P2102 (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 P2102 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 P2102?

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.

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