The P2119 trouble code is a diagnostic code related to the throttle actuator control system in modern vehicles. When this code is triggered, it indicates that the Powertrain Control Module (PCM) has detected a problem with the throttle body’s range or performance. This issue can significantly affect your vehicle’s drivability and fuel efficiency, making it crucial to address promptly.
| P2119 Code Meaning | P2119 Code Common Causes |
|---|---|
| Throttle Actuator Control Throttle Body Range/Performance Issue | Faulty throttle body |
| Electronic Throttle Control System Malfunction | Damaged or dirty throttle plate |
| Throttle Position Sensor (TPS) Signal Out of Range | Faulty throttle position sensor |
| PCM-Detected Discrepancy in Throttle Operation | Wiring issues or poor electrical connections |
| Throttle Actuator Motor Performance Problem | Defective throttle actuator motor |
Faulty Throttle Body
The throttle body is a critical component of the engine’s air intake system, controlling the amount of air entering the engine based on driver input and engine requirements. When it malfunctions, it can trigger the P2119 code.
Symptoms
- Rough or unstable idle
- Hesitation during acceleration
- Reduced engine performance
- Check Engine Light illumination
Technical Explanation
The throttle body houses the throttle plate, which opens and closes to regulate airflow. It also contains sensors that provide feedback to the PCM about the throttle position. A faulty throttle body may not respond correctly to PCM commands or may provide inaccurate position data.
Step-by-Step Diagnosis
- Connect an OBD-II scanner and confirm the P2119 code.
- Visually inspect the throttle body for carbon buildup or physical damage.
- Check the throttle plate for smooth operation by manually moving it (engine off).
- Use a multimeter to test the throttle position sensor’s voltage output.
- Monitor live data from the throttle position sensor using a scan tool.
Solution Methods
- Clean the throttle body using a specialized throttle body cleaner.
- If cleaning doesn’t resolve the issue, replace the entire throttle body assembly.
- After replacement, perform the necessary throttle relearn procedure.
Cost Estimates
- Throttle body cleaning: $50 – $100
- Throttle body replacement: $200 – $600 (parts and labor)
Warning: Never spray cleaner directly into the throttle body while the engine is running, as this can cause severe engine damage.
Damaged or Dirty Throttle Plate
A throttle plate that’s damaged or coated with carbon deposits can cause erratic throttle behavior, leading to the P2119 code.
Symptoms
- Sticking accelerator pedal
- Inconsistent idle speed
- Poor throttle response
- Decreased fuel economy
Technical Explanation
The throttle plate is a butterfly valve inside the throttle body that opens and closes to control airflow. If it’s damaged or dirty, it may not move smoothly or seal properly, causing irregular airflow and triggering the P2119 code.
Step-by-Step Diagnosis
- Remove the air intake duct to access the throttle body.
- Inspect the throttle plate for visible damage or carbon buildup.
- Check for smooth operation by gently moving the plate (engine off).
- Look for any signs of wear on the throttle shaft.
Solution Methods
- Clean the throttle plate using a soft brush and throttle body cleaner.
- If damaged, replace the entire throttle body assembly.
- Perform a throttle relearn procedure after cleaning or replacement.
Cost Estimates
- DIY cleaning: $10 – $20 for cleaning supplies
- Professional cleaning: $50 – $150
- Throttle body replacement (if plate is damaged): $200 – $600
Recommendation: Always use a cleaner specifically designed for throttle bodies to avoid damaging sensitive components.
Faulty Throttle Position Sensor (TPS)
The Throttle Position Sensor provides crucial information to the PCM about the throttle plate’s position. A malfunctioning TPS can lead to incorrect throttle control and trigger the P2119 code.
Symptoms
- Sudden changes in idle speed
- Hesitation or stumbling during acceleration
- Poor fuel economy
- Intermittent stalling
Technical Explanation
The TPS is typically a potentiometer that changes resistance based on the throttle plate’s position. It sends a voltage signal to the PCM, which uses this information to adjust fuel injection and ignition timing. A faulty TPS may send erratic or incorrect signals.
Step-by-Step Diagnosis
- Use a scan tool to monitor TPS voltage while slowly opening and closing the throttle.
- Check for smooth voltage transitions without any drops or spikes.
- Perform a resistance test on the TPS using a multimeter.
- Inspect the TPS wiring for any damage or loose connections.
Solution Methods
- Clean the TPS and its electrical connections.
- If cleaning doesn’t resolve the issue, replace the TPS.
- Some vehicles may require the replacement of the entire throttle body assembly.
Cost Estimates
- TPS replacement: $100 – $250
- Throttle body assembly replacement (if TPS is not separately available): $200 – $600
Warning: Ensure you obtain the correct TPS for your specific vehicle make and model, as using an incompatible sensor can cause further issues.
Wiring Issues or Poor Electrical Connections
Damaged wiring or poor electrical connections in the throttle control system can cause intermittent signals or voltage drops, triggering the P2119 code.
Symptoms
- Intermittent Check Engine Light
- Erratic throttle response
- Engine stalling or misfiring
- Difficulty starting the vehicle
Technical Explanation
The throttle control system relies on precise electrical signals between various components and the PCM. Any interruption or alteration in these signals due to wiring problems can cause the PCM to detect a range or performance issue with the throttle actuator control.
Step-by-Step Diagnosis
- Visually inspect all wiring and connectors related to the throttle body and TPS.
- Check for signs of corrosion, fraying, or damage.
- Use a multimeter to test for continuity in the wiring harness.
- Perform a voltage drop test across connections while wiggling wires.
Solution Methods
- Clean corroded connections using electrical contact cleaner.
- Repair or replace damaged wiring.
- Replace faulty connectors.
- Apply dielectric grease to connections to prevent future corrosion.
Cost Estimates
- DIY wiring repair: $20 – $50 for supplies
- Professional wiring repair: $100 – $300
- Wiring harness replacement: $200 – $1000+ depending on the extent of replacement needed
Recommendation: When working with electrical systems, always disconnect the battery to prevent short circuits or electrical shocks.
Defective Throttle Actuator Motor
The throttle actuator motor is responsible for physically moving the throttle plate. If it fails, the throttle may not respond correctly to PCM commands, resulting in the P2119 code.
Symptoms
- Unresponsive or sluggish acceleration
- Engine gets stuck at idle or high RPM
- Sudden loss of power while driving
- Vehicle enters “limp mode”
Technical Explanation
The throttle actuator motor receives signals from the PCM to adjust the throttle plate position. It uses a small electric motor and gearing system to precisely control throttle movement. A defective motor may not move the throttle plate accurately or quickly enough to meet the PCM’s demands.
Step-by-Step Diagnosis
- Use a scan tool to command the throttle open and closed while observing its movement.
- Listen for any unusual noises from the throttle body during operation.
- Check the resistance of the throttle actuator motor using a multimeter.
- Inspect the motor’s wiring for any signs of damage or loose connections.
Solution Methods
- In most cases, the entire throttle body assembly needs to be replaced, as the actuator motor is often not serviceable separately.
- After replacement, perform the necessary throttle relearn procedure.
- Clear any stored codes and perform a test drive to ensure the issue is resolved.
Cost Estimates
- Throttle body assembly replacement: $200 – $600
- Labor costs: $100 – $200
Warning: Never attempt to disassemble the throttle body or actuator motor, as this can cause irreparable damage and potentially dangerous throttle operation.
In conclusion, the P2119 code indicates a problem with the throttle actuator control system that requires prompt attention. While some causes can be addressed with simple cleaning or minor repairs, others may necessitate component replacement. Always follow proper diagnostic procedures and consult your vehicle’s service manual for specific guidance. If you’re unsure about performing any repairs yourself, it’s best to seek the assistance of a qualified automotive technician to ensure the issue is resolved safely and effectively.
Frequently Asked Questions About P2119
- Can I drive my car with the P2119 code?
While your car may still run, it’s not recommended to drive with this code active. The vehicle may enter “limp mode” with reduced performance, potentially creating unsafe driving conditions. - How long does it take to fix a P2119 code?
Diagnosis typically takes 1-2 hours. Repairs can range from 30 minutes for a simple cleaning to 3-4 hours for a throttle body replacement, depending on the vehicle model and the specific issue. - Will the P2119 code clear itself?
The code may clear itself if the issue was temporary, but it’s unlikely to stay cleared if there’s an ongoing problem. Always address the root cause rather than relying on the code to clear on its own. - How much does it cost to fix a P2119 code?
Costs can vary widely, from $50-$100 for a simple throttle body cleaning to $500-$1000 for a complete throttle body replacement, including parts and labor. Always get a detailed quote from a reputable mechanic. - Can a bad battery cause a P2119 code?
While uncommon, a weak battery can cause voltage fluctuations that may trigger various codes, including P2119. However, this is rarely the root cause and other issues should be investigated first. - Is the P2119 code related to emissions?
Yes, the throttle control system is part of the engine management system, which directly affects emissions. A malfunctioning throttle can lead to increased emissions and failed emissions tests. - Can I replace the throttle body myself?
While it’s possible for an experienced DIYer, throttle body replacement often requires special tools and procedures, including a throttle relearn process. It’s generally recommended to have a professional perform this repair. - How often should I clean my throttle body to prevent P2119?
Most manufacturers don’t specify a cleaning interval, but many mechanics recommend cleaning the throttle body every 30,000 to 60,000 miles as preventive maintenance. However, this can vary based on driving conditions and vehicle model.