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.
2021 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE
Can Communication System
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2014 - 08/2016]
| DTC Code | Description |
|---|---|
| U0104 | Lost Communication with Driving Support ECU |
| U0182 | Lost Communication with Lighting Control Module Front |
| U0198 | Lost Communication with Telematic Control Module |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U023A | Lost Communication with Front Camera Module |
| U0265 | Lost Communication with Parking Assist Monitor Module |
| U1002 | Lost Communication with Gateway Module (Sensor Bus) |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1002 | Lost Communication with Gateway Module (Network Gateway ECU) |
| U1110 | Lost Communication with Clearance Sonar Module |
| U1115 | Lost Communication with Tilt & Telescopic Module |
| U1117 | Lost Communication with Accessory Gateway |
| U1172 | Lost Communication with Vehicle Dynamics Control Module (ch2) |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [08/2016 - 11/2017]
| DTC Code | Description |
|---|---|
| U0104 | Lost Communication with Driving Support ECU |
| U0132 | Lost Communication with Suspension Control ECU |
| U0182 | Lost Communication with Lighting Control Module Front |
| U0198 | Lost Communication with Telematic Control Module |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U023A | Lost Communication with Front Camera Module |
| U0265 | Lost Communication with Parking Assist Monitor Module |
| U1002 | Lost Communication with Gateway Module (Sensor Bus) |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1002 | Lost Communication with Gateway Module (Network Gateway ECU) |
| U1110 | Lost Communication with Clearance Sonar Module |
| U1115 | Lost Communication with Tilt & Telescopic Module |
| U1117 | Lost Communication with Accessory Gateway |
| U1172 | Lost Communication with Vehicle Dynamics Control Module (ch2) |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2017 - 03/2019]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0182 | Lost Communication with Lighting Control Module Front |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U110F | Lost Communication With Roll Rate Sensor/Vertical Acceleration Sensor Module |
| U1115 | Lost Communication with Tilt & Telescopic Module |
| U1172 | Lost Communication with Vehicle Dynamics Control Module (ch2) |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [03/2019 - 01/2023]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0132-87 | Lost Communication with Suspension Control Module "A" Missing Message |
| U0182 | Lost Communication with Lighting Control Module Front |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt & Telescopic Module |
| U1172 | Lost Communication with Vehicle Dynamics Control Module (ch2) |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [01/2023 - ]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0132-87 | Lost Communication with Suspension Control Module "A" Missing Message |
| U0182 | Lost Communication with Lighting Control Module Front |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0209 | Lost Communication with "Seat Control Module B" |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt & Telescopic Module |
Factory Service Tools
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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.
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