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A truck came in with a “lost communication with throttle actuator” code and a long list of replaced parts—but the problem was never the parts. This video shows why communication codes get misdiagnosed and how the parts cannon took over.

Using scope data and simple logic, the real cause is uncovered: an intermittent bad ground that only failed under load. A quick, practical reminder of why verifying powers and grounds matters before replacing anything.

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00:00 – The Problem & Misdiagnosis
Multiple parts replaced for one communication code

02:00 – What the Code Really Means
Understanding U0107 and serial data faults

05:00 – How the System Communicates
Dedicated data lines between PCM and TAC

10:30 – The First Clue on the Scope
A signal that shouldn’t exist

16:30 – The Real Cause Revealed
Intermittent bad ground

20:00 – Why the Failure Only Happens on Crank
Load, current, and heat expose the fault

27:00 – Proving It With Testing
Recreating the problem and matching symptoms

32:30 – Why the Ground Was Missed
Key-on testing vs loaded circuits

37:00 – Confirming the Fix
Finding the bad ground in the right place

45:00 – Final Takeaways
How to avoid the parts cannon next time

⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.