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 MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEM (W/ AFS) - DIAGNOSTIC CODES (1 OF 2)LIGHTING SYSTEM (W/ AFS)DTC U0073: CONTROL MODULE COMMUNICATION BUS OFF; DTC U0100: LOST COMMUNICATION WITH ECM/PCM "A"; DTC U0101: LOST COMMUNICATION WITH TCM; DTC U0126: LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE; DTC U0129: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE; DTC U0142: LOST COMMUNICATION WITH BODY CONTROL MODULE "B"; DTC U0155: LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE; DTC U0242: LOST COMMUNICATION WITH HEADLAMP CONTROL MODULE "B"; DTC U0293: LOST COMMUNICATION WITH HYBRID VEHICLE CONTROL SYSTEM [12/2019 - 11/2023]DESCRIPTION
2025 Toyota Highlander XLE, FWD
DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication With Hybrid Vehicle Control System [12/2019 - 11/2023]: Description
2025 Toyota Highlander XLE, FWDSECTION Description
These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly LH and other ECUs.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| U0073 | Control Module Communication Bus Off | The headlight ECU sub-assembly LH does not send/receive data. | CAN communication system | AFS |
| U0100 | Lost Communication With ECM/PCM "A" | The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more. |
|
AFS |
| U0101 | Lost Communication with TCM | for HV Model:
for Gasoline Model:
|
for HV Model:
for Gasoline Model:
|
AFS |
| U0126 | Lost Communication with Steering Angle Sensor Module | The headlight ECU sub-assembly LH does not receive data from the steering sensor for approximately 10 seconds or more. |
|
AFS |
| U0129 | Lost Communication with Brake System Control Module | for HV Model:
for Gasoline Model:
|
for HV Model:
for Gasoline Model:
|
AFS |
| U0142 | Lost Communication with Body Control Module "B" | The headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more. |
|
AFS |
| U0155 | Lost Communication with Instrument Panel Cluster (IPC) Control Module | The headlight ECU sub-assembly LH does not receive data from the combination meter assembly for approximately 30 seconds or more. |
|
AFS |
| U0242 | Lost Communication With Headlamp Control Module "B" | The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH for approximately 10 seconds or more. |
|
AFS |
| U0293 | Lost Communication With Hybrid Vehicle Control System | The headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more. |
|
AFS |
RENDER: 1.0x
NO RELATED
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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.