U0107 — Data Bus: Throttle Actuator Control (TAC) Module – No Communication #

Please note: The wording of this code may differ depending on the vehicle manufacturer (OEM).
Common label variations for U0107 include:

• U0107: Lost Communication with Throttle Actuator Control Module (General Motors, Ford, Chrysler)
• U0107: No Communication with Throttle Body Control Module (Toyota, Honda)
• U0107: CAN Bus – No Signal from TAC Module (Volkswagen/Audi)

Code U0107 Overview #

The U0107 diagnostic trouble code (DTC) signals a loss of communication between the vehicle’s main computer—known as the Powertrain Control Module (PCM)—and the Throttle Actuator Control (TAC) module. The TAC module is responsible for regulating the electronic throttle body, translating your accelerator pedal input into precise engine throttle movement. When the PCM cannot communicate with the TAC module over the vehicle’s Controller Area Network (CAN) bus, it triggers this code. This can result in various drivability problems, as the engine may not respond correctly to throttle input. Prompt attention is crucial to restore normal engine operation and prevent unsafe driving conditions.

Common Symptoms for Code U0107 #

When your vehicle stores a U0107 code, you might notice a range of issues, from subtle to severe. These symptoms generally relate to throttle response and overall drivability, as the electronic link between your foot and the engine is disrupted. Typical symptoms include:

• Check Engine Light (CEL) illuminated
• Reduced engine power mode (limp mode)
• Unresponsive or erratic throttle
• Poor acceleration
• Engine may not start (in rare cases)
• Warning messages on the dashboard (e.g., “Reduced Power”, “Service Throttle Soon”)

Most Probable Causes for Code U0107 #

Several issues can trigger a U0107 code, but some are more common than others. Understanding the likely root causes, in order of frequency, helps streamline diagnostics:

1. Faulty or disconnected TAC module
2. Damaged wiring or loose connectors in the TAC circuit
3. Blown fuse or relay associated with the throttle system
4. Corroded or poor ground connection
5. Faulty PCM (rare)
6. CAN bus communication fault due to network issue

Step-by-Step Diagnostic Process for U0107 #

Diagnosing a U0107 trouble code requires a logical, stepwise approach to avoid unnecessary parts replacement and wasted time. Here’s how a professional technician would tackle it:

• 1. Scan for additional codes: Other network or throttle-related codes can provide helpful clues.
• 2. Visually inspect TAC module and connectors: Look for disconnected, corroded, or broken wires and pins.
• 3. Check fuses and relays: Locate and test any fuses or relays related to the throttle control system.
• 4. Test TAC module power and ground: Use a multimeter to ensure proper voltage and ground at TAC connector.
• 5. Verify CAN bus integrity: Use a scan tool to check if other modules communicate normally; inspect CAN bus wiring as needed.
• 6. Check for software updates: Some OEMs release PCM or TAC software updates to resolve communication glitches.
• 7. Substitute a known-good TAC module or PCM (if possible): Only after other steps, to confirm a module failure.

Possible Repairs for U0107 #

Once the root cause is identified, repairs for U0107 are typically straightforward and directly tied to the failed component or connection:

• Reconnect or replace damaged wiring/connectors between PCM and TAC module
• Replace faulty TAC module if it’s confirmed to be non-responsive
• Replace blown fuse or faulty relay supplying power to the throttle control circuit
• Clean or repair ground connections affecting module communication
• Update or reprogram PCM or TAC software per OEM recommendations
• Replace PCM (very rare; only after all other possibilities are ruled out)

Is It Safe to Drive with U0107? #

Generally, it is NOT recommended to drive with a U0107 code present. If your vehicle enters “limp mode” or loses throttle response, it may be unable to accelerate properly or could stall unexpectedly, creating a safety risk for you and other road users. Even if the car still runs, unpredictable throttle behavior can quickly turn hazardous. For your safety and to prevent further damage, have the vehicle inspected and repaired as soon as possible.

Vehicles Most Commonly Affected by U0107 #

While U0107 can appear on any vehicle with electronic throttle control, it is more frequently seen in vehicles that rely heavily on drive-by-wire systems. Models from the following OEMs are more likely to experience this issue:

• General Motors (Chevrolet, GMC, Buick, Cadillac)
• Ford (including Lincoln and Mercury)
• Chrysler (Dodge, Jeep, Ram)
• Toyota and Lexus
• Honda and Acura
• Volkswagen and Audi

Common Mistakes & Best Practices for U0107 #

Misdiagnosis is common with communication codes like U0107. Avoid these pitfalls and follow best practices to ensure an accurate fix:

• Don’t overlook simple connector issues—many cases are fixed by simply securing or cleaning a loose plug.
• Don’t replace the TAC module or PCM without confirming loss of communication—module failures are less common than wiring faults.
• Always check for related codes—they can point to root network or power issues.
• Perform a thorough visual and hands-on check before using advanced diagnostics.
• Consult OEM service information—manufacturer bulletins may exist for known issues.

Quick FAQ for Code U0107 #

Q: Can a dead battery or jump-start cause U0107?
A: Yes. Power interruptions or low voltage can disrupt module communication and trigger U0107. If the code appeared after a battery event, check all connections and clear codes after confirming system health.

Q: Is U0107 always a hardware failure?
A: Not always. While damaged modules or wiring are often to blame, software glitches or even corrosion at a connector can cause intermittent communication loss.

If you have any doubts about tackling this code yourself, seek assistance from a qualified automotive technician. Prompt, professional diagnosis is the surest path to restoring your vehicle’s performance and reliability.