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 NX 300h BaseFACTORY OEM SERVICE PROCEDURE
Can Communication System
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2014 - 09/2016]
| DTC Code | Description |
|---|---|
| U0100 | Lost Communication with ECM / PCM "A" |
| U0104 | Lost Communication with Cruise Control Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0182 | Lost Communication with AFS ECU |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U023A | Lost Communication with Front Camera Module |
| U0265 | Lost Communication with Parking Assist Monitor Module |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U1002 | Lost Communication with Gateway Module (Main Body) |
| U1002 | Lost Communication with Gateway Module |
| U1110 | Lost Communication with Clearance Sonar Module |
| U1115 | Lost Communication with Tilt & Telescopic Module |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2016 - 09/2017]
| DTC Code | Description |
|---|---|
| U0100 | Lost Communication with ECM / PCM "A" |
| U0104 | Lost Communication with Cruise Control Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0182 | Lost Communication with AFS ECU |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| U0233 | Lost Communication with Blind Spot Monitor Master Module |
| U023A | Lost Communication with Front Camera Module |
| U0265 | Lost Communication with Parking Assist Monitor Module |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U1002 | Lost Communication with Gateway Module |
| U1002 | Lost Communication with Gateway Module (Main Body) |
| U1110 | Lost Communication with Clearance Sonar Module |
| U1115 | Lost Communication with Tilt & Telescopic Module |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2017 - 05/2019]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| U1002 | Lost Communication with Gateway Module (Main Body ECU) |
| U1115 | Lost Communication with Tilt & Telescopic Module |
CAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [05/2019 - ]
| DTC Code | Description |
|---|---|
| B1003 | ECU Malfunction |
| U0199 | Lost Communication with "Door Control Module A" |
| U0200 | Lost Communication with "Door Control Module B" |
| U0208 | Lost Communication with "Seat Control Module A" |
| U0230 | Lost Communication with Rear Gate Module |
| 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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