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2016 Toyota 4Runner SR5 4.0L No Start
Posted to Asian Driveability on 5/22/2025 5 Replies

I have the Code U100 multiple times. I have no check engine light, and I can't communicate with the PCM or the TCM. I have tried unplugging multiple sensors and have checked for the 5-volt reference, and I do have it. I have used two different scanners wit...

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car Vehicle Data

2016 Toyota 4Runner SR5

VIN JTEZU5JR3G
Engine4.0 L / 6 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsNo Start
OccursAlways

Trouble Codes

U0100Lost Communication With PCM
Open Help Request

car Vehicle Data

2016 Toyota 4Runner SR5

VIN JTEZU5JR3G
Engine4.0 L / 6 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsNo Start
OccursAlways

Trouble Codes

U0100Lost Communication With PCM