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 Acura RDX BaseFACTORY OEM SERVICE PROCEDURE
Master Lighting Control Unit DTCS
MASTER LIGHTING CONTROL UNIT
| DTC | Description | DTC type |
|---|---|---|
| B214A | Master lighting control unit internal failure | Internal error |
| B214B | Master lighting control unit internal failure | Internal error |
| B214C | Master lighting control unit lost communication with all ambient light on LIN | Loss of communication |
| B214D | Ambient light failure | Signal error |
| B214E | Master lighting control unit lost communication with ambient light on LIN | Loss of communication |
| U1280 | Master lighting control unit B-CAN communication error (BUS-OFF) | Loss of communication |
| U1281 | Master lighting control unit lost communication with MICU/BCM | Loss of communication |
| U128D | Master lighting control unit lost communication with gauge control module | Loss of communication |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.