U0107

Universal

Lost Communication With Throttle Actuator Control Module

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine or powertrain controller has detected that it cannot communicate with the throttle actuator control module. This module is involved in electronic throttle operation, but its exact role and whether it is separate or integrated depend on the vehicle. The fault may cause a warning light, reduced engine power, poor throttle response, stalling, or a no-start condition; some vehicles may show no obvious symptoms.

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⚠️ Before You Begin (Safety First)

If throttle response is limited or unpredictable, the engine stalls, or the vehicle enters reduced-power mode, pull over safely and avoid continuing to drive until it has been assessed. Do not attempt to force or adjust electronic throttle components.

Common Symptoms

  • No noticeable symptoms; an intermittent or brief communication loss may not cause an obvious change in vehicle operation.
  • Reduced engine power or a warning message may occur if the controller limits throttle operation after losing communication.
  • Poor, delayed, or limited throttle response may occur because electronic throttle operation depends on communication between control systems.
  • Engine stalling or a no-start condition may occur in some vehicles if the communication loss prevents required throttle control.
  • A check-engine or other powertrain warning light may appear.

Common Causes

  • A loose, damaged, or corroded connector may interrupt communication with the throttle actuator control module.
  • Damaged wiring or a poor electrical connection may interrupt the module’s power, ground, or network communication.
  • A weak battery or unstable vehicle voltage may disrupt communication between control modules.
  • A fuse or other power-supply problem may prevent the module from operating.
  • A fault elsewhere on the vehicle communication network may prevent messages from reaching the module.
  • The throttle actuator control module may be faulty, but this should be confirmed by testing before replacement.

Diagnostic Steps

  1. Record the code and any other warning lights or symptoms before clearing anything; related codes can help show whether the problem affects one module or the wider communication network.
  2. With the vehicle safely parked, check the battery terminals for looseness or visible corrosion. Unstable voltage can interfere with module communication.
  3. With the ignition off, visually inspect accessible wiring and connectors related to the throttle-control system for obvious damage, loose connections, or corrosion. Do not force connectors or manipulate throttle components.
  4. Check the owner’s manual for relevant fuses and inspect them only as directed. Replace a fuse only with the specified type and rating; if it fails again, seek diagnosis rather than repeatedly replacing it.
  5. If the code returns, or throttle response is abnormal, arrange professional diagnosis using vehicle-specific service information. Avoid driving if the vehicle stalls or throttle control is unreliable.

When to Call a Professional

A technician can check for related communication and voltage codes, confirm which modules are communicating, and inspect the throttle-control module’s power, ground, connectors, wiring, and network signals using vehicle-specific service information. The code alone does not prove that the module needs replacement.

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Commonly Asked Questions

Does U0107 prove that the throttle actuator control module has failed?

No. It indicates lost communication with that module, which can result from a power, ground, connector, wiring, network, or module problem. Testing is needed to identify the cause.

Can I drive with U0107?

It depends on how the vehicle behaves. If throttle response is limited or unpredictable, the engine stalls, or reduced-power mode is active, stop somewhere safe and arrange assistance. If there are no symptoms, have the fault checked promptly and follow any vehicle warnings.

Why might the vehicle show U0107 but still run normally?

The communication loss may have been brief or intermittent, and the vehicle may not show an obvious symptom. The code can still help identify a connection, voltage, wiring, or network issue that should be investigated if it returns.

Should I replace the throttle actuator control module?

Not based on this code alone. A technician should first verify module power and ground, inspect connections and wiring, and check for broader communication-network problems. The module’s configuration and service procedures vary by vehicle.

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