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2019
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Sienna SE, AWD
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Repair and Diagnosis
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Different car
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Section 13 (Engine Control System [2GR-FE] - Diagnostic Codes (3 Of 3) & Circuit Tests)
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SFI System
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DTC U0101: Lost Communication with TCM [12/2015 - 08/2016]
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Typical Malfunction Thresholds
Typical Malfunction Thresholds
WARNING:
This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
Communication signal
Lost communication with TCM