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.
U0001Automatic Gearbox Shifter Module (AGSM) CAN Communication BUS (BUS Off)
U0001-81TRANSMISSION CONTROL MODULE [TCM]
Manufacturer communications
35Original wording in English
FORD
Some 2025 Maverick hybrid vehicles built on or before 17-Feb-2025 may exhibit diagnostic trouble code (DTC) U0001:88 stored in the air conditioning control module (ACCM). If no customers symptoms are present, download and run the "air conditioning control module (ACCM) software update" application in the Ford Diagnosis and Repai…
RAM
EPS And Other CAN C Modules Offline, U0001-00, U0002-00, and U0131-00 Can C Bus Diagnostic Trouble Codes (DTCs).
RAM
EPS Steering Gear Prior to replacing EPS gear for Can C Bus Diagnostic Trouble Codes (DTCs), U0001 & U0002, please contact FCA Redacted Content. Please have the following info available: VIN, vehicle complaint, diagnostics completed, first name and last name, Dealer code, Service Manager name, Phone number or email address. If n…
RAM
EPS And Other CAN C Modules Offline, U0001 And U0002 Can C Bus Diagnostic Trouble Codes (DTCs)
Check vehicle applicability
257A 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.