P2119 Code: Here's How to Solve It Fast

The P2119 code is a diagnostic trouble code (DTC) related to the throttle actuator control system in modern vehicles. This code indicates that the powertrain control module (PCM) has detected a problem with the throttle body's range or performance. When this code is triggered, it means that the electronic throttle control is not operating as requested, which can lead to decreased engine performance and other drivability issues.

P2119 Code Meaning	P2119 Code Common Causes
Throttle Actuator Control Throttle Body Range/Performance issue	Faulty throttle body
Electronic throttle control not operating as requested	Dirty or sticking throttle plate
PCM detects inconsistent throttle position readings	Damaged wiring or connectors
Potential safety concern due to unexpected throttle behavior	Faulty throttle position sensor (TPS)
Indicates a problem in the fuel and air metering system	Defective accelerator pedal position sensor (APPS)

Understanding the Throttle Actuator Control System

The throttle actuator control system is a critical component of modern engine management. It replaces the traditional mechanical linkage between the accelerator pedal and the throttle body with an electronic system. This allows for more precise control of the engine's air intake, resulting in improved fuel efficiency and reduced emissions.

Symptoms of P2119 Code

When the P2119 code is present, you may experience one or more of the following symptoms:

1. Decreased engine performance
2. Engine entering "limp home" mode with reduced power
3. Little or no throttle response
4. Illuminated Check Engine Light
5. Rough idling or stalling
6. Increased fuel consumption
7. Difficulty starting the engine
8. Smoke from the tailpipe

Technical Explanation

The P2119 code is set when the PCM detects that the throttle plate's actual position doesn't match the commanded position. This discrepancy can occur due to various factors, including mechanical issues with the throttle body, electrical problems in the throttle control circuit, or sensor malfunctions.

The electronic throttle control system uses input from the accelerator pedal position sensor to determine how much the driver wants to accelerate. It then sends commands to the throttle actuator motor to open or close the throttle plate accordingly. The throttle position sensor provides feedback to the PCM about the actual position of the throttle plate. If there's a significant difference between the commanded position and the actual position, the P2119 code will be triggered.

Step-by-Step Diagnosis

To diagnose the P2119 code, follow these steps:

1. Connect an OBD-II scanner to the vehicle's diagnostic port and retrieve all stored codes and freeze frame data.
2. Clear the codes and test drive the vehicle to see if the P2119 code returns.
3. If the code returns, use the scanner to view live data from the throttle position sensor (TPS) and accelerator pedal position sensor (APPS).
4. Observe the TPS readings while slowly pressing and releasing the accelerator pedal. The readings should change smoothly and consistently.
5. Inspect the throttle body for carbon buildup or debris that could be impeding the throttle plate's movement.
6. Check all wiring and connectors related to the throttle control system for damage, corrosion, or loose connections.
7. Use a multimeter to test the voltage and resistance of the TPS and throttle actuator motor according to the manufacturer's specifications.
8. If all tests pass, consider performing a throttle relearn procedure as specified by the vehicle manufacturer.

Solution Methods

Depending on the root cause of the P2119 code, one or more of the following solutions may be necessary:

1. Cleaning the Throttle Body

If the throttle body is dirty or the throttle plate is sticking, a thorough cleaning may resolve the issue.

• Remove the throttle body from the vehicle
• Use a specialized throttle body cleaner and a soft brush to remove carbon deposits
• Clean the throttle plate and surrounding areas carefully
• Allow the cleaner to dry completely before reinstalling the throttle body

Warning: Never force the throttle plate open, as this can damage the throttle actuator motor.

2. Replacing the Throttle Body

If cleaning doesn't solve the problem or if the throttle body is found to be faulty, replacement may be necessary.

• Purchase a new throttle body that matches your vehicle's specifications
• Disconnect the battery before beginning work
• Remove the air intake duct and any other components blocking access to the throttle body
• Disconnect the electrical connectors and remove the mounting bolts
• Install the new throttle body, ensuring proper alignment and torquing of bolts
• Reconnect all electrical connectors and reinstall removed components
• Perform a throttle relearn procedure after installation

3. Repairing Wiring Issues

If damaged wiring or connectors are found, they must be repaired or replaced.

• Identify the damaged section of wiring or connector
• If a wire is damaged, cut out the damaged section and splice in a new piece of wire with the same gauge
• Use heat shrink tubing or electrical tape to insulate the repair
• If a connector is damaged, replace it with a new one of the same type
• Ensure all connections are clean, tight, and properly seated

4. Replacing the Throttle Position Sensor (TPS)

In some cases, the TPS may be replaceable separately from the throttle body.

• Locate the TPS on the side of the throttle body
• Remove the mounting screws and disconnect the electrical connector
• Install the new TPS, ensuring proper alignment
• Reconnect the electrical connector and secure the mounting screws
• Perform a throttle relearn procedure after installation

5. Replacing the Accelerator Pedal Position Sensor (APPS)

If the APPS is found to be faulty, it will need to be replaced.

• Locate the APPS, typically attached to the accelerator pedal assembly
• Disconnect the electrical connector and remove the mounting bolts
• Install the new APPS, ensuring proper alignment with the pedal
• Reconnect the electrical connector and secure the mounting bolts
• Perform any necessary calibration procedures as specified by the manufacturer

Cost Estimates

The cost to fix a P2119 code can vary depending on the root cause and the vehicle make and model. Here are some general estimates:

• Throttle body cleaning: $50 - $150
• Throttle body replacement: $200 - $600
• Wiring repair: $100 - $300
• Throttle position sensor replacement: $150 - $400
• Accelerator pedal position sensor replacement: $200 - $500

These estimates include parts and labor. DIY repairs can significantly reduce costs, but professional diagnosis and repair are recommended for those unfamiliar with automotive electronics.

Warnings and Recommendations

Always disconnect the vehicle's battery before working on electrical components to avoid short circuits or electrical shocks.

If you're not comfortable performing these repairs, seek the help of a qualified mechanic. Improper repairs can lead to more severe issues and potential safety hazards.

It's crucial to address the P2119 code promptly, as driving with a malfunctioning throttle control system can be dangerous. The vehicle may unexpectedly lose power or accelerate, potentially leading to accidents.

After any repairs or replacements, clear the codes and perform a thorough test drive to ensure the problem is resolved. If the code persists, further diagnosis may be necessary, possibly involving more advanced diagnostic tools or professional expertise.

Regular maintenance, including periodic cleaning of the throttle body and inspection of the throttle control system components, can help prevent issues that lead to the P2119 code.

In conclusion, the P2119 code indicates a problem with the throttle actuator control system that requires attention. By following the diagnostic steps and applying the appropriate solutions, you can resolve this issue and restore your vehicle's performance and safety. Remember to always prioritize safety and seek professional help when needed.

Frequently Asked Questions About P2119

• Can I drive my car with a P2119 code?
  While it may be possible to drive short distances, it's not recommended. The vehicle may enter limp mode or experience unexpected throttle behavior, which can be dangerous.
• How often should I clean my throttle body to prevent P2119 issues?
  Most manufacturers recommend cleaning the throttle body every 30,000 to 60,000 miles. However, this can vary based on driving conditions and vehicle model.
• Will a P2119 code clear itself?
  The code may clear temporarily if the issue resolves, but it will likely return if the underlying problem isn't fixed. Always address the root cause rather than relying on the code to clear on its own.
• Can a bad battery cause a P2119 code?
  While uncommon, a weak battery can cause voltage fluctuations that may affect the throttle control system. It's worth checking the battery and charging system as part of your diagnosis.
• Is it necessary to replace the entire throttle body if I have a P2119 code?
  Not always. Sometimes cleaning or replacing individual components like the TPS can resolve the issue. However, in many modern vehicles, the throttle body is sold as a complete unit.
• How long does it take to replace a throttle body?
  For an experienced mechanic, throttle body replacement typically takes 1-2 hours. DIY time may vary depending on skill level and vehicle accessibility.
• Can weather conditions trigger a P2119 code?
  Extreme temperatures or humidity can sometimes affect electronic components. However, a properly functioning system should be able to handle normal weather variations.
• Is it safe to perform a throttle body cleaning myself?
  If you're comfortable working on your vehicle, throttle body cleaning can be a DIY task. However, be careful not to damage the throttle plate or allow cleaning solution into the engine. When in doubt, consult a professional.