99 4Runner High Pitched Noise.

Temple90

New member
Was driving home today and randomly the truck started making a high pitched noise. Was able to make it home and look under the hood, maybe a pulley but sounds like something else. Didn't throw CEL initially but when I turned truck on and off CEL was on.
The noise also stayed on for about a minute with the truck off. Here is a video where you can clearly hear it.
Haven't ran the code yet, but wanted to check if anyone's experienced similar issue.
- YouTube
 
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Was driving home today and randomly the truck started making a high pitched noise. Was able to make it home and look under the hood, maybe a pulley but sounds like something else. Didn't throw CEL initially but when I turned truck on and off CEL was on.
The noise also stayed on for about a minute with the truck off. Here is a video where you can clearly hear it.
Haven't ran the code yet, but wanted to check if anyone's experienced similar issue.
- YouTube

Possibly the Alternator diode going bad.
 

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