U0107 Lost Communication With Throttle Actuator Control Module

Introduction:

The U0107 diagnostic trouble code (DTC) indicates a loss of communication between the vehicle's Engine Control Module (ECM) and the Throttle Actuator Control (TAC) module. This communication breakdown can lead to significant drivability issues and requires prompt diagnosis and repair. Addressing this code is crucial for restoring proper engine operation and preventing potential damage.

Comprehensive Table: U0107 Lost Communication With Throttle Actuator Control Module

Detailed Explanations:

Code Definition: U0107: Lost Communication With Throttle Actuator Control (TAC) Module

The U0107 code is a network communication error code. It means the ECM, the main computer in your car, can't "talk" to the TAC module. The TAC module controls the electronic throttle body, determining how much air enters the engine. This communication is vital for proper engine operation.

Symptoms: Reduced engine power, limp mode, erratic idling, stalling, throttle response issues, check engine light illuminated, inability to accelerate, transmission problems (shifting issues).

The symptoms arise because the ECM relies on the TAC module to control the throttle. When communication is lost, the ECM often defaults to a "limp mode" to protect the engine. This severely restricts engine power and speed. Other symptoms stem from the inability to precisely control the throttle opening.

Possible Causes (Detailed):

• CAN Bus Issues: The CAN (Controller Area Network) bus is the vehicle's communication network. If the CAN bus is damaged, corroded, or has loose connections, communication between modules will be disrupted. Think of it like a damaged internet cable preventing your computer from accessing the network. Faulty terminating resistors (which maintain signal integrity) can also cause problems.

• TAC Module Failure: The TAC module itself might be faulty. This could be due to internal electrical damage, physical damage, or software corruption within the module. Just like any electronic component, it can fail over time.

• ECM Failure: Although less common, the ECM could be the source of the problem. Internal electrical faults, software corruption, or an inability to properly communicate on the CAN bus can all lead to a U0107 code.

• Wiring Harness Issues: The wiring harness that connects the ECM and TAC module can develop problems such as open circuits (broken wires), short circuits (wires touching each other), chafed or damaged insulation, and corroded connectors. These issues interrupt the flow of communication signals.

• Power and Ground Issues: Both the ECM and TAC module need a stable power supply and a good ground connection to function correctly. Faulty ground connections, insufficient power, or blown fuses can disrupt communication.

Diagnostic Steps:

• Visual Inspection: Start by visually inspecting the wiring harnesses and connectors related to the ECM and TAC module. Look for any signs of damage, corrosion, or loose connections. Check the fuses associated with these modules as well.

• CAN Bus Testing: Use a multimeter to check the CAN bus voltage. A healthy CAN bus should have a specific voltage range. An oscilloscope provides a more detailed view of the CAN bus signal, allowing you to identify signal distortion or interference. Check the CAN bus terminating resistors for proper resistance (typically 60 ohms).

• Module Power and Ground Testing: Use a multimeter to verify that the ECM and TAC module are receiving the correct voltage and have a good ground connection. Refer to the vehicle's wiring diagram for the correct pin locations.

• Wiring Continuity Testing: Use a multimeter to check the continuity of the wiring between the ECM and TAC module. This ensures that the wires are not broken or damaged. Refer to the wiring diagram for the correct wire connections.

• Module Replacement (Last Resort): Only consider replacing the TAC module or ECM after all other tests have been exhausted. Ensure that the replacement module is properly programmed and configured to match the vehicle's specifications.

• Software/Firmware Update: Check for any available software updates for the ECM and TAC module. Outdated software can sometimes cause communication issues. A dealer or a qualified repair shop with the appropriate diagnostic tools can perform software updates.

Related Codes:

U0001, U0100, U0101, U0102, U0103, U0104, U0105, U0106, U0108, U0109, U0110, U0111, U0112. These are all "U" codes, indicating communication errors. They might relate to other modules, giving you clues to a wider network issue. For example, if you also have a U0100 (Lost Communication with ECM/PCM), it strongly suggests a CAN bus problem affecting multiple modules.

Severity:

The severity of a U0107 code is considered high. The loss of communication between the ECM and TAC module can lead to significant drivability issues, reduced engine power, and potential engine damage. Addressing this code promptly is essential for maintaining vehicle safety and performance.

Common Mistakes:

• Ignoring Wiring Issues: Focusing solely on module replacement without thoroughly inspecting the wiring harness is a common mistake. Wiring problems are often the root cause of communication failures.

• Failing to Test CAN Bus: Overlooking the importance of CAN bus integrity in communication failures is another common error. The CAN bus is the backbone of vehicle communication, and its proper functioning is crucial.

• Assuming Module Failure: Immediately replacing modules without proper diagnosis can lead to unnecessary expense. Always perform thorough testing before replacing any module.

Tools Required:

OBD-II scanner, multimeter, oscilloscope (optional), wiring diagram, CAN bus analyzer (optional). These tools are essential for diagnosing the U0107 code accurately. An OBD-II scanner allows you to read the code and other diagnostic information. A multimeter is used for testing voltage, continuity, and resistance. An oscilloscope provides a visual representation of electrical signals, which can be helpful for diagnosing CAN bus issues. A wiring diagram provides information about the wiring connections between the ECM and TAC module. A CAN bus analyzer is a specialized tool for diagnosing CAN bus problems.

Typical Repair Costs:

The repair costs for a U0107 code can vary widely depending on the cause of the problem. A simple wiring repair might cost only a few dollars, while module replacement and programming can cost several hundred dollars. Professional diagnosis and repair are often recommended to ensure accurate diagnosis and proper repair.

Frequently Asked Questions:

• What does the U0107 code mean? It indicates a loss of communication between the Engine Control Module (ECM) and the Throttle Actuator Control (TAC) module. This disrupts the engine's ability to control the throttle.

• Can I drive my car with a U0107 code? Driving is not recommended. The vehicle may be in limp mode with reduced engine power and impaired throttle response, which can be unsafe.

• Is the U0107 code serious? Yes, it's a serious issue that can lead to significant drivability problems and potential engine damage if left unaddressed.

• Can a bad battery cause a U0107 code? A weak or failing battery can sometimes cause communication issues between modules, but it's less likely to directly cause a U0107. It's more likely to trigger other voltage-related codes first.

• How do I fix a U0107 code? The repair involves diagnosing and addressing the underlying cause of the communication failure, which could include wiring repairs, CAN bus testing, or module replacement. Professional diagnosis is often recommended.

Conclusion:

The U0107 code signifies a critical communication failure between the ECM and TAC module, impacting engine performance and potentially leading to safety concerns. Thorough diagnosis, utilizing appropriate tools and a systematic approach, is essential for identifying and resolving the root cause of the problem and restoring proper vehicle operation.