U0107 is a generic OBD-II network code indicating a control module lost communication with the Throttle Actuator Control (TAC) module over the vehicle’s communication bus.
This code identifies a network communication condition rather than confirming a single failed component. Targeted electrical and network diagnosis is required to identify the root cause.
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Key Takeaways
- U0107 indicates a control module lost communication with the Throttle Actuator Control module.
- Possible causes include open or shorted network wiring, poor connectors, lost module power, or a failed TAC module.
- Diagnosis requires checking power and ground at the TAC module and testing the communication network circuits.
- Repairs depend on the confirmed root cause and may involve wiring repair or throttle body replacement.
U0107 Code Description and Implications
U0107 is a generic OBD-II network code indicating that a control module has lost communication with the Throttle Actuator Control (TAC) module.
Modern electronic throttle systems use a dedicated TAC module to operate the throttle plate based on accelerator pedal input.
On many applications, this TAC module is integrated directly into the throttle body assembly.
When the Powertrain Control Module stops receiving data messages from the TAC module over the communication bus, it logs this code.
Because U0107 is a generic network code, this fundamental monitoring logic applies across various vehicles from multiple manufacturers.
However, the exact network architecture and diagnostic procedures vary depending on the specific vehicle application.
When diagnosing an error code related to network communication, verifying the exact factory wiring diagram is critical.
Common Causes of the U0107 Code
The underlying causes for a lost communication code generally involve the network wiring, module power, ground circuits, or the module itself.
Lost Power or Ground: The TAC module may have lost its main power supply or ground connection due to a blown fuse or broken wire.
Network Wiring Fault: An open or short circuit on the Controller Area Network High or Low communication wires connecting to the TAC module.
Corroded Connectors: Moisture intrusion or damaged pins at the TAC module or PCM connectors can interrupt the data signal.
Failed TAC Module: An internal failure within the Throttle Actuator Control module can prevent it from transmitting data on the network.
Symptoms Associated With U0107
The prominent symptom is the illumination of the Check Engine Light and an electronic throttle control warning message.
The vehicle will likely enter a fail-safe or limp mode, severely limiting engine RPM and vehicle speed.
The accelerator pedal may feel completely unresponsive, as the PCM disables the throttle motor to ensure safety.
Depending on the application, the engine may stall at idle or refuse to start until the communication fault is resolved.
Diagnosing the U0107 Trouble Code
Diagnosis must begin by confirming the exact factory service information and network topology for the specific vehicle application.
Check for other network codes that might indicate a broader communication failure rather than an isolated TAC module issue.
Verify that the TAC module has proper battery voltage and clean ground connections before testing the communication circuits.
Use a digital multimeter or oscilloscope to test the network circuits between the PCM and the TAC module for opens or shorts.
If power, ground, and network wiring are confirmed intact, the TAC module itself may have failed internally.
Repairing the U0107 Issue
Repairs must follow confirmed diagnosis. Never replace the PCM or throttle body solely based on the presence of a network code.
If a blown fuse is found, identify and repair the short circuit that caused the fuse to blow before replacing it.
If the network wiring is open or shorted, repair the wires and secure the harness away from sharp edges or hot components.
If connectors are corroded, clean the terminals, apply dielectric grease, or replace the pigtail connector.
If electrical testing confirms the TAC module has internal network failure, replace the throttle body assembly using a component meeting the correct specification.
Cost Considerations for U0107 Repairs
Repair costs vary considerably depending on the confirmed root cause and the specific vehicle application.
Repairing damaged network wiring or replacing a blown fuse involves minimal parts and moderate labor costs.
Replacing a throttle body assembly involves standard parts costs, though labor can increase if significant intake disassembly is required.
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Prevention Strategies for Future Occurrences
Preventing network communication faults requires protecting the vehicle’s engine bay wiring from physical damage and environmental exposure.
Inspecting the wiring harness near the throttle body can help identify developing chafing or heat damage before it causes a network short.
Keeping module connector seals intact may reduce moisture intrusion and terminal corrosion in harsh driving environments.
Troubleshooting Tips and Best Practices
Always check for Technical Service Bulletins related to U0107 for your specific vehicle application.
Manufacturers may release updated wiring harness pigtail kits, revised throttle body part numbers, or software updates to address known network issues.
Do not assume the throttle body requires replacement simply because a communication code is present.
A simple blown fuse, a chafed network wire, or a corroded connector can produce the code without the module being defective.
If the vehicle recently underwent intake service, verify that the TAC module connector was fully seated and the wiring was not pinched.
More OBD-II Codes
| U0100 | U0101 | U0109 | U0073 |
| U0121 | U0126 | U0140 | U0151 |
| U0155 | U1000 | U1001 | U1017 |
| P2100 | P2101 | P2102 | P2103 |
| P2104 | P0505 | P0121 | P0220 |
| P0700 | P0300 | P0171 | P0420 |
Frequently Asked Questions
Is the U0107 code generic or manufacturer-specific?
U0107 is a generic SAE-defined OBD-II network code. Its fundamental definition regarding lost communication with the Throttle Actuator Control module applies across various manufacturers.
Can a blown fuse cause a U0107 code?
Yes. If the fuse supplying power to the Throttle Actuator Control module blows, the module will shut down and stop communicating, triggering this code.
Will disconnecting the battery clear the U0107 code?
Disconnecting the battery may temporarily clear the code, but it does not repair the underlying network or power fault. It also erases valuable freeze frame data.
Can I drive my vehicle with a U0107 code?
Driving is not recommended. A lost communication fault with the throttle module forces the vehicle into a severe limp mode or disables the throttle entirely.
Does U0107 mean the throttle body must be replaced?
Not necessarily. While an internal module failure is a possible cause, a blown fuse, an open network wire, or a corroded connector can also trigger the code.
What Should You Do About the U0107 Code?
Confirm the exact factory definition and diagnostic procedure for your specific vehicle application before attempting repairs.
Do not assume the throttle body or PCM requires replacement based solely on the presence of the diagnostic trouble code.
Inspect the TAC module power and ground circuits, verify connector integrity, and test the network communication lines to rule out external faults.
Follow the applicable manufacturer diagnostic workflow to isolate the relevant system and components before replacing any hardware.
