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330: And All Through The Shop, Not A Creature Was Stirring... Expect For This Hungry Mouse

330: And All Through The Shop, Not A Creature Was Stirring... Expect For This Hungry Mouse

Automotive Diagnostic Podcast Dec 08, 2025 32 min
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About this episode

Rodent damage to vehicle wiring can cause unique and challenging electrical issues, especially when mice chew on critical CAN bus wires. The host shares intriguing cases, including two Ford F-150s with the same wire chewed years apart and a complex 2019 Toyota Corolla HVAC problem caused by a mouse chewing wires under the fuse box. The episode highlights how rodent damage can cause open and short circuits, backfeed power through modules, and create puzzling symptoms. Diagnostic tips include checking CAN bus bias voltage and carefully tracing power feeds to isolate faults. It’s a deep dive into unusual electrical diagnostics driven by unexpected rodent behavior.

Topics: rodent damage electrical wiring issues can bus diagnostics open and short circuits diagnostic techniques hvac system faults power backfeed ford f-150 wiring toyota corolla hvac automotive troubleshooting
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Technical Too Afraid to Ask
Car

Ford F150

"So I'll give you the scenario and actually I don't even have the exact year. I think it was around a 2010 ish Ford F-150 and it wouldn't start and you couldn't communicate with a number of control modules."
Car

Ford Escape

"...twisted pair. I don't know. Anyways, I had a Ford Escape recently, where that was the case. Not only did t..."
Car

Toyota Corolla

"...allowed this to happen. So this was a 2019 Toyota Corolla. And the issue that they were having was once you..."
3 cars featured

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