The P2119 OBD-II trouble code indicates a problem with the throttle actuator control system, specifically related to the throttle body range or performance. This code is set when the Powertrain Control Module (PCM) detects that the electronic throttle control is not operating as requested, potentially causing decreased engine performance and drivability issues.
| P2119 Code Meaning | P2119 Code Common Causes |
|---|---|
| Throttle Actuator Control Throttle Body Range/Performance issue | Faulty throttle position sensor (TPS) |
| Electronic throttle control not operating as requested | Damaged throttle actuator motor |
| Throttle valve position discrepancy | Dirty or sticking throttle body |
| PCM-detected throttle control malfunction | Corroded or damaged wiring in the TAC circuit |
| Potential safety concern due to unexpected throttle behavior | Faulty accelerator pedal position sensor (APPS) |
Faulty Throttle Position Sensor (TPS)
The throttle position sensor is a crucial component of the electronic throttle control system, providing feedback to the PCM about the current position of the throttle plate.
Symptoms
- Erratic idle
- Hesitation during acceleration
- Sudden drops in engine power
- Inconsistent throttle response
Technical Explanation
The TPS is typically a potentiometer or Hall effect sensor that translates the throttle plate’s position into a voltage signal. When faulty, it can send incorrect or inconsistent data to the PCM, triggering the P2119 code.
Step-by-Step Diagnosis
- Connect an OBD-II scanner and check for additional related codes.
- Use the scanner to view live data from the TPS while slowly opening and closing the throttle.
- Look for smooth transitions in the TPS readings. Jumps or flat spots indicate a problem.
- Measure the resistance of the TPS using a multimeter, comparing results to manufacturer specifications.
- Check the TPS wiring for any signs of damage or corrosion.
Solution Methods
- Clean the throttle body and TPS contacts if dirty.
- Adjust the TPS if it’s out of calibration (on adjustable models).
- Replace the TPS if it’s determined to be faulty.
Cost Estimates
- TPS replacement: $100 – $250
- Throttle body cleaning: $50 – $100
- Professional diagnosis: $75 – $150
Warning: Improper handling of the throttle body can cause serious engine performance issues. If you’re unsure, seek professional assistance.
Damaged Throttle Actuator Motor
The throttle actuator motor is responsible for physically moving the throttle plate based on commands from the PCM.
Symptoms
- Engine stalling
- Lack of throttle response
- Check Engine Light illumination
- Vehicle enters limp mode
Technical Explanation
The throttle actuator motor uses an electric motor and gear system to precisely control the throttle plate position. When damaged, it may not respond correctly to PCM commands, leading to a mismatch between expected and actual throttle positions.
Step-by-Step Diagnosis
- Visually inspect the throttle body for any obvious damage or obstructions.
- Use a scan tool to command the throttle open and closed, observing its movement.
- Listen for any unusual noises from the throttle body during operation.
- Check the resistance of the throttle actuator motor windings using a multimeter.
- Inspect the throttle actuator motor wiring for any signs of damage or poor connections.
Solution Methods
- Clean the throttle body if there’s carbon buildup affecting the plate’s movement.
- Replace the entire throttle body assembly if the actuator motor is integrated and faulty.
- In some cases, the actuator motor might be replaceable separately.
Cost Estimates
- Throttle body replacement: $200 – $600
- Throttle actuator motor (if separate): $150 – $300
- Professional installation: $100 – $200
Recommendation: Always use OEM or high-quality aftermarket parts for throttle body replacements to ensure proper functionality and avoid future issues.
Dirty or Sticking Throttle Body
A dirty throttle body can cause the throttle plate to stick or move erratically, leading to the P2119 code.
Symptoms
- Rough idle
- Stalling when coming to a stop
- Hesitation during acceleration
- Uneven or surging engine performance
Technical Explanation
Over time, carbon deposits can build up on the throttle plate and surrounding housing. This buildup can interfere with the smooth operation of the throttle, causing it to stick or move unpredictably.
Step-by-Step Diagnosis
- Remove the air intake duct to access the throttle body.
- Visually inspect the throttle plate and housing for carbon buildup.
- Manually move the throttle plate (with the engine off) to check for smooth operation.
- Use a scan tool to monitor throttle position while an assistant presses the accelerator pedal.
- Look for any delays or inconsistencies in throttle movement.
Solution Methods
- Clean the throttle body using a specialized throttle body cleaner.
- Gently remove carbon deposits with a soft brush or cloth.
- Avoid spraying cleaner directly into the throttle body; instead, apply it to a cloth first.
- After cleaning, perform a throttle relearn procedure using a scan tool.
Cost Estimates
- DIY throttle body cleaning: $10 – $20 for cleaner
- Professional throttle body cleaning service: $50 – $150
Warning: Never force the throttle plate open, as this can damage the delicate components inside the throttle body.
Corroded or Damaged Wiring in the TAC Circuit
Wiring issues can cause intermittent or constant problems with the throttle actuator control system.
Symptoms
- Intermittent Check Engine Light
- Erratic throttle behavior
- Loss of throttle control
- Multiple related trouble codes
Technical Explanation
The throttle actuator control system relies on precise electrical signals. Corroded, frayed, or damaged wiring can introduce resistance or intermittent connections, leading to erroneous signals and triggering the P2119 code.
Step-by-Step Diagnosis
- Visually inspect all wiring related to the throttle body and accelerator pedal.
- Check for signs of rodent damage, heat damage, or corrosion.
- Use a multimeter to perform continuity tests on suspect wires.
- Wiggle wire harnesses while monitoring for changes in system behavior.
- Check ground connections for tightness and corrosion.
Solution Methods
- Repair any damaged wires using proper automotive-grade wire and connectors.
- Clean corroded connections with electrical contact cleaner.
- Replace entire wiring harness sections if damage is extensive.
- Apply dielectric grease to connections to prevent future corrosion.
Cost Estimates
- DIY wire repair: $20 – $50 for supplies
- Professional wiring repair: $100 – $300
- Wiring harness replacement: $200 – $600
Recommendation: Always use a wiring diagram specific to your vehicle when diagnosing electrical issues to ensure accurate testing and repair.
Faulty Accelerator Pedal Position Sensor (APPS)
The APPS, also known as the throttle pedal position sensor, provides input to the PCM regarding the driver’s throttle demand.
Symptoms
- Delayed or no response to accelerator pedal input
- Engine rev-hanging
- Inconsistent acceleration
- Vehicle enters limp mode
Technical Explanation
The APPS typically consists of two or more sensors for redundancy. When these sensors provide conflicting information or fall out of their expected range, the PCM may set the P2119 code and limit throttle operation as a safety measure.
Step-by-Step Diagnosis
- Use a scan tool to monitor APPS voltages while slowly pressing and releasing the pedal.
- Look for smooth, consistent changes in voltage without drops or spikes.
- Compare the values from multiple APPS sensors (if equipped) for consistency.
- Check the resistance of the APPS using a multimeter, comparing to specifications.
- Inspect the APPS wiring and connector for any signs of damage or corrosion.
Solution Methods
- Clean the APPS connector if corrosion is present.
- Adjust the accelerator pedal position if it’s out of calibration (where applicable).
- Replace the entire accelerator pedal assembly if the APPS is integrated and faulty.
Cost Estimates
- APPS replacement: $150 – $350
- Accelerator pedal assembly replacement: $200 – $500
- Professional diagnosis and installation: $100 – $200
Warning: A malfunctioning APPS can cause unexpected acceleration or lack of throttle response. If you suspect an APPS issue, avoid driving the vehicle until it’s repaired.
In conclusion, the P2119 code indicates a potentially serious issue with the throttle control system that requires prompt attention. While some causes like a dirty throttle body can be addressed by a skilled DIY mechanic, many of the potential issues involve complex electronic systems that may require professional diagnosis and repair. Always prioritize safety and seek expert help if you’re unsure about any aspect of the diagnosis or repair process.
Frequently Asked Questions About P2119
- Can I drive my car with the P2119 code?
It’s not recommended to drive with this code active. The vehicle may enter limp mode or experience unpredictable throttle behavior, which can be dangerous. - How often should I clean my throttle body to prevent P2119?
Most manufacturers don’t specify a cleaning interval. However, cleaning every 30,000 to 60,000 miles can help prevent issues, especially in high-mileage vehicles. - Will a P2119 code clear itself?
The code may clear if the issue resolves temporarily, but it will likely return if the underlying problem isn’t fixed. Proper diagnosis and repair are necessary for a permanent solution. - Can a bad battery cause a P2119 code?
While uncommon, a weak battery can cause voltage fluctuations that may affect the throttle control system. However, this usually triggers other codes as well. - Is the P2119 code covered under warranty?
It depends on your vehicle’s age, mileage, and specific warranty terms. Many manufacturers cover electronic throttle components under powertrain warranties. - How long does it take to replace a throttle body?
A professional mechanic can typically replace a throttle body in 1-2 hours, depending on the vehicle model and accessibility. - Can aftermarket performance chips cause a P2119 code?
Yes, some aftermarket performance modifications can interfere with the throttle control system and trigger this code. Always use reputable products and consider potential impacts on your vehicle’s systems. - Is it normal for the throttle body to make noise?
A slight whirring noise during key-on engine-off self-tests is normal. However, grinding, clicking, or loud buzzing noises during operation may indicate a problem that could lead to a P2119 code.