Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2018SIENNA LIMITED, AWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESCAN COMMUNICATION SYSTEM - DIAGNOSTIC CODES (1 OF 2)
2018 Toyota Sienna Limited, AWD
Can Communication System - Diagnostic Codes (1 Of 2)
2018 Toyota Sienna Limited, AWDSECTION Can Communication System - Diagnostic Codes (1 Of 2)
- Can Communication System
- DTC B1003: ECU Malfunction [11/2017 - ]
- DTC U0100: Lost Communication with ECM / PCM [12/2015 - 08/2016]
- DTC U0104: Lost Communication with Driving Support ECU [12/2015 - 11/2017]
- DTC U0114: Lost Communication with 4WD Control ECU [08/2016 - 11/2017]
- DTC U0164: Lost Communication with A/C ECU [12/2015 - 08/2016]
- DTC U0182: Lost Communication with AFS ECU [12/2015 - 11/2017]
- DTC U0199: Lost Communication with "Door Control Module A" [12/2015 - 11/2017]
- DTC U0199: Lost Communication with "Door Control Module A" [11/2017 - 08/2018]
- DTC U0199: Lost Communication with "Door Control Module A" [08/2018 - ]
- DTC U0200: Lost Communication with "Door Control Module B" [12/2015 - 11/2017]
- DTC U0200: Lost Communication with "Door Control Module B" [11/2017 - 08/2018]
- DTC U0200: Lost Communication with "Door Control Module B" [08/2018 - ]
- DTC U0201: Lost Communication with "Door Control Module C" [12/2015 - 11/2017]
- DTC U0201: Lost Communication with "Door Control Module C" [11/2017 - 08/2018]
- DTC U0201: Lost Communication with "Door Control Module C" [08/2018 - ]
- DTC U0202: Lost Communication with "Door Control Module D" [12/2015 - 11/2017]
- DTC U0202: Lost Communication with "Door Control Module D" [11/2017 - 08/2018]
- DTC U0202: Lost Communication with "Door Control Module D" [08/2018 - ]
- DTC U0208: Lost Communication with "Seat Control Module A" [12/2015 - 11/2017]
- DTC U0208: Lost Communication with "Seat Control Module A" [11/2017 - 08/2018]
- DTC U0208: Lost Communication with "Seat Control Module A" [08/2018 - ]
- DTC U0230: Lost Communication with Rear Gate Module [11/2017 - 08/2018]
- DTC U0230: Lost Communication with Rear Gate Module [08/2018 - ]
- DTC U0233: Lost Communication with Blind Spot Monitor Master Module [12/2015 - 08/2016]
- DTC U0233: Lost Communication with Blind Spot Monitor Master Module [08/2016 - 11/2017]
- DTC U1002: Lost Communication with Gateway Module [11/2017 - 08/2018]
- DTC U1002: Lost Communication with Gateway Module [08/2018 - ]
- DTC U1002: Lost Communication with Gateway Module (Power Management2) [12/2015 - 08/2016]
- DTC U1002 (CAN MS BUS): Lost Communication with Gateway Module (Main body ECU) [12/2015 - 11/2017]
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.