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DTC codes / P21xx · Fuel and air metering / P2119

P2119Throttle Actuator Control Throttle Body Range/Performance

P2119 is a generic powertrain code indicating that the engine computer has detected a problem with the throttle actuator control (TAC) system's ability to maintain the commanded throttle plate position within the expected range. The computer compares the actual throttle position from the throttle position sensor (TPS) to the desired position and sets this code when the two do not match for a calibrated period, often during a self-test or while the throttle is being moved.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Reduced engine power or limp mode, limiting vehicle speed
  • Unresponsive accelerator pedal or delayed throttle response
  • Rough idle or stalling when coming to a stop
  • Hesitation or surging during acceleration
  • Unusual noises from the throttle body, such as humming or clicking

Common causes, most likely first

  1. Carbon buildup or contamination on the throttle plate and bore, restricting movement
  2. Faulty throttle body assembly, including a sticking actuator motor or damaged gears
  3. Wiring issues in the throttle actuator control circuit, such as chafed wires or corroded connectors
  4. Failed throttle position sensor (TPS) or accelerator pedal position sensor (APP) providing inaccurate feedback
  5. Engine control module (ECM) software calibration issue or internal fault
  6. Low battery voltage or poor grounds affecting the TAC system operation

How to diagnose and fix it

  1. Inspect the throttle body for carbon deposits and clean it thoroughly with throttle body cleaner and a soft brush
  2. Check the TAC circuit wiring and connectors for damage, corrosion, or loose pins, and repair as needed
  3. Perform a throttle body relearn or calibration procedure using a scan tool after cleaning or replacement
  4. Test the throttle position sensor and accelerator pedal position sensor with a multimeter for smooth resistance changes
  5. Verify battery voltage and ground connections are within specification and load test the battery if necessary
  6. Replace the throttle body assembly if the actuator motor or internal sensors are faulty
  7. Reprogram or replace the ECM only after all other causes have been ruled out and technical service bulletins have been checked

Don't Replace the Throttle Body Yet

  • A dirty throttle body is the most common cause of P2119, and a proper cleaning often resolves the code without any parts replacement.
  • Many vehicles require a throttle body relearn procedure after cleaning or replacement; skipping this step can cause the code to return immediately.
  • A weak battery or poor ground connection can cause intermittent TAC faults that mimic a failing throttle body, so always check voltage and grounds first.
  • The code can be set by a mismatch between the throttle position sensor and the accelerator pedal position sensor, so both signals must be verified.
  • Aftermarket throttle bodies sometimes have calibration issues that set P2119 even when the part is new, so OEM or quality equivalent parts are recommended.

Can I keep driving with P2119?

If the vehicle is in limp mode or the throttle response is erratic, it is safest to avoid driving until the fault is repaired. If the only symptom is the warning light and the car drives normally, you can drive cautiously to a repair shop, but avoid aggressive acceleration or heavy loads.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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