Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U0180lost communication with auto L/T
U0180LOST COMMUNICATION WITH AUTO L/T
U0180LOST COMMUNICATION WITH AUTOMATIC LIGHTING CONTROL UNIT/SENSOR
Manufacturer communications
8Original wording in English
HONDA
Service Bulletin - Service Manual Update: DTC B121E - The service information is missing the troubleshooting procedures for DTC B121E climate control lunit lost communication with touch control panel DTC B121E was mistakenly assigned to this vehicle and dos not apply. For troulbleshooting, use the procledures for DTC U0180 LOST …
HONDA
SERVICE BULLETIN - THE SERVICE INFORMATION IS MISSING THE TROUBLESHOOTING PROCEDURES FOR DTC B121E (CLIMATE CONTROL UNIT LOST COMMUNICATION WITH TOUCH CONTROL PANEL). DTC B121E WAS MISTAKENLY ASSIGNED TO THIS VEHICLE AND DOES NOT APPLY. FOR TROUBLESHOOTING, USE THE PROCEDURES FOR DTC U0180 (LOST COMMUNICATION WITH AUTOMATIC LIGH…
CADILLAC
This engineering informational bulletinis ending the need of information from the field on vehicles with the conditon of loss of audio, chimes or turn signal click/clack, with DTC U0180 or B1325 sym03
HONDA
Are you reading a DTC B121E (climate control unit lost communication with touch control panel) on the HDS and you can’t find anything in the service information to help you troubleshoot it? Just use the troubleshooting procedure for DTC U0180 (lost communication with auto L/T); it’s the one you want. DTC B121E was mistakenly ass…
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.