U0107

Lost Communication With Throttle Actuator Control Module

Network / Communication Network/Communication Module Communication Loss 🟡 Moderate — Fix within a week ⚠️ Drive with Care
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What This Actually Means

In plain language — no jargon

Your engine computer has lost its electrical conversation with the throttle control module, like a phone call dropping mid-conversation. The throttle can't receive commands to adjust engine airflow, causing drivability issues.

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Symptoms You May Notice

3 known symptoms for this code
Check Engine Light illuminated
Engine idle rough or unstable
Reduced engine power or limp mode activation
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECM communicates with the Throttle Actuator Control (TAC) module via CAN or dedicated bus to command throttle position and monitor feedback. The ECM expects valid data packets at regular intervals; if communication fails for a set duration (typically 100-500ms), the fault is triggered.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
TAC Module Communication Timeout Valid data received every 10-50ms No response for >100ms or repeated checksum errors
Bus Voltage Level 12-14V stable <10V or >16V causes signal corruption
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Battery terminals and connectors
Clean corrosion from battery posts, ground straps, and all engine bay connectors with a wire brush to restore electrical contact.
2
CAN bus or TAC wiring harness
Inspect under-hood wiring for pinched, cracked, or corroded connectors; reseat any loose plugs on the throttle body and ECM.
3
Throttle Actuator Control Module
If wiring is sound, the TAC module itself may be faulty and require replacement by a dealer or qualified technician.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code U0107 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code U0107

What happens after you fix the fault

Once the fault is repaired, U0107 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.