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 Toyota Venza XLEFACTORY OEM SERVICE PROCEDURE
Lighting System
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B124400 | Light Sensor Circuit Malfunction |
| B243900 | Headlight LH Circuit |
| B243A00 | Headlight RH Circuit |
| U010087 | Lost Communication With ECM/PCM "A" Missing Message |
| U010187 | Lost Communication with TCM Missing Message |
| U011187 | Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message |
| U012087 | Lost Communication with Starter / Generator Control Module Missing Message |
| U012687 | Lost Communication with Steering Angle Sensor Module Missing Message |
| U012987 | Lost Communication with Brake System Control Module Missing Message |
| U015187 | Lost Communication with Restraints Control Module Missing Message |
| U015587 | Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message |
| U016387 | Lost Communication with Navigation Control Module Missing Message |
| U016487 | Lost Communication with HVAC Control Module Missing Message |
| U016887 | Lost Communication with Vehicle Security Control Module Missing Message |
| U020887 | Lost Communication with "Seat Control Module A" Missing Message |
| U023087 | Lost Communication with Rear Gate Module Missing Message |
| U023A87 | Lost Communication with Image Processing Module "A" Missing Message |
| U029387 | Lost Communication with Hybrid/EV Powertrain Control Module Missing Message |
| U110687 | Lost Communication with Electric Parking Brake Module Missing Message |
| U111587 | Lost Communication with Tilt & Telescopic Module Missing Message |
Factory Service Tools
Use the Manual With the Right Hardware
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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.