Why does the 4L light flashing on and off?

Asked by flyfish64 Nov 22, 2015 at 08:36 AM about the 2013 Toyota Tundra Grade Double Cab 5.7L 4WD

Question type: Maintenance & Repair

The engine light, track off and 4L light come on every time I start the truck.
The 4L light flashes on and off.

6 Answers
80

Mitzi answered 4 years ago

Known issue due to soy based insulation on wiring harness rodents chew on them harness will have to be replaced temp fix is remove ground from battery wait a few minutes resets computer

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90

GuruHCMZH answered 4 years ago

Where do they typically chew on the harness? Want to know where to start looking.

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Patrick answered 4 years ago

was this solved? curious, I am having the same problem

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90

Dirtywork83 answered 4 years ago

I had the same issue after towing using a 7 blade connector. Check the backup fuse in the dash panel fuse block. Might be blown. If not, its likely that it needs a repair harness installed from Toyota. Its a well known TSB(technical service bulletin)

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Dirtywork83 answered 4 years ago

I just looked up the tsb buuuut it applies only to 07 model years with a floor shift. Ill look again Monday for your model year

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