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.
2016 Toyota MiraiFACTORY OEM SERVICE PROCEDURE
Lighting System
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [06/2015 - 11/2018]
| DTC Code | Description |
|---|---|
| B1244 | Light Sensor Circuit Malfunction |
| B2414 | Steering Position Sensor Malfunction |
| B242C | Right Headlight ECU Malfunction |
| B242D | Left Headlight ECU Malfunction |
| B242E | Open in IG Circuit |
| B2439 | Headlamp LH Circuit |
| B243A | Headlamp RH Circuit |
| B243D | Left Low Beam Fan Malfunction |
| B243E | Right Low Beam Fan Malfunction |
| B2443 | Lost Communication with Left Headlight and Right Headlight LIN |
| B2451 | Vehicle Specifications have not been Stored |
| B2455 | Right Headlight ECU Variation Error |
| B2456 | Left Headlight ECU Variation Error |
| U0073 | Control Module Communication Bus OFF |
| U0100 | Lost Communication with EV ECU |
| U0101 | Lost Communication with TCM |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0142 | Lost Communication with Body Control Module "B" |
| U0155 | Lost Communication with Instrument Panel Cluster (IPC) Control Module |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U1000 | CAN Communication Failure (Message Registry) |
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2018 - ]
| DTC Code | Description |
|---|---|
| B1244 | Light Sensor Circuit Malfunction |
| B2414 | Steering Position Sensor Malfunction |
| B242C | Right Headlight ECU Malfunction |
| B242D | Left Headlight ECU Malfunction |
| B242E | Open in IG Circuit |
| B2439 | Headlamp LH Circuit |
| B243A | Headlamp RH Circuit |
| B243D | Left Low Beam Fan Malfunction |
| B243E | Right Low Beam Fan Malfunction |
| B2443 | Lost Communication with Left Headlight and Right Headlight LIN |
| B2451 | Vehicle Specifications have not been Stored |
| B2455 | Right Headlight ECU Variation Error |
| B2456 | Left Headlight ECU Variation Error |
| U0073 | Control Module Communication Bus OFF |
| U0100 | Lost Communication with EV ECU |
| U0101 | Lost Communication with TCM |
| U012587 | Lost Communication with Multi-axis Acceleration Sensor Module Missing Message |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U012987 | Lost Communication with Brake System Control Module Missing Message |
| U014087 | Lost Communication with Body Control Module Missing Message |
| U0142 | Lost Communication with Body Control Module "B" |
| U0155 | Lost Communication with Instrument Panel Cluster (IPC) Control Module |
| U023587 | Lost Communication with Cruise Control Front Distance Range Sensor Signal Sensor or Center Missing Message |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U029387 | Lost Communication with Hybrid Powertrain Control Module Missing Message |
| U1000 | CAN Communication Failure (Message Registry) |
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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