P2108 — Throttle Actuator Control Module Performance

P2108 — Throttle Actuator Control Module Performance. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: intake air leaks after the MAF sensor, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.

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 P2108 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 Inspect and clean the throttle body; check that the plate moves freely.
  5. Subsystem check Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2108 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2108 (parts and labor, USD, independent shop rates): Replace the MAF or MAP sensor: $150–$400; Clean the throttle body: $80–$200; Replace the throttle body assembly: $250–$700. Overall, fixing P2108 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

What is the most common cause of P2108?

The most common causes are: intake air leaks after the MAF sensor, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.

How do I diagnose P2108 myself?

Start with a scan: confirm P2108, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the throttle and intake air metering, and verify the suspect component against live data before buying parts.

How much does it cost to fix P2108?

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

Will P2108 clear itself?

Sometimes P2108 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 are the symptoms of P2108?

Drivers most often notice: limp-home mode with reduced power, stalling when coming to a stop, poor throttle response, unstable or high idle.

What does P2108 mean?

Behind P2108 is a specific failure in the throttle and intake air metering: throttle actuator control module performance. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2108 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

Common symptoms of P2108

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

What causes P2108?

  • dirty throttle body or stuck throttle plate
  • wiring or connector faults in the throttle circuit
  • faulty throttle position sensor or pedal sensor
  • intake air leaks after the MAF sensor

How to diagnose P2108

  1. Connect an OBD2 scanner, confirm P2108 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. Inspect and clean the throttle body; check that the plate moves freely.
  5. Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2108 does not return.

How to fix P2108

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

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

How much does it cost to fix P2108?

Repair cost depends on which component actually failed. Typical scenarios for P2108 (parts and labor, USD, independent shop rates):

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

Overall, fixing P2108 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 P2108?

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