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 MANUALSTOYOTA20254RUNNER SR5, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXDTC INDEX (2 OF 2)LIGHTING (EXT) DTCSLIGHTING SYSTEM
2025 Toyota 4Runner SR5, 4WD
Lighting System
2025 Toyota 4Runner SR5, 4WDSECTION Lighting System
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1244-00 | Light Sensor Circuit Malfunction |
| B2439-00 | Headlight LH Circuit |
| B243A-00 | Headlight RH Circuit |
| U0100-87 | Lost Communication with ECM/PCM "A" Missing Message |
| U0101-87 | Lost Communication with TCM Missing Message |
| U0111-87 | Lost Communication with Battery Energy Control Module "A" Missing Message |
| U0126-87 | Lost Communication with Steering Angle Sensor Module Missing Message |
| U0129-87 | Lost Communication with Brake System Control Module "A" Missing Message |
| U0151-87 | Lost Communication with Restraints Control Module Missing Message |
| U0155-87 | Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message |
| U0163-87 | Lost Communication with Navigation Control Module Missing Message |
| U0164-87 | Lost Communication with HVAC Control Module Missing Message |
| U0168-87 | Lost Communication with Vehicle Security Control Module Missing Message |
| U0199-87 | Lost Communication with "Door Control Module A" Missing Message |
| U0200-87 | Lost Communication with "Door Control Module B" Missing Message |
| U0208-87 | Lost Communication with "Seat Control Module A" Missing Message |
| U0230-87 | Lost Communication with Rear Gate Module Missing Message |
| U023A-87 | Lost Communication with Image Processing Module "A" Missing Message |
| U023B-87 | Lost Communication with Image Processing Module "B" Missing Message |
| U0265-87 | Lost Communication with Image Processing Sensor A Missing Message |
| U1104-87 | Lost Communication with Cruise Control Module Missing Message |
| U1106-87 | Lost Communication with Electric Parking Brake Module Missing Message |
| U1107-87 | Lost Communication with Power Management Module Missing Message |
| U1110-87 | Lost Communication with Intuitive Parking Assist Module Missing Message |
| U1115-87 | Lost Communication with Tilt & Telescopic Module Missing Message |
| U1117-87 | Lost Communication with Accessory Gateway Missing Message |
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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.