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.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U2516IC-CAN BUS OFF TRANSMIT ERRORManufacturer communications
1Original wording in English
MAZDA
Reported code forms U2516
ENGINE NO CRANK ALONG WITH IMMOBILIZER MALFUNCTION. DIAGNOSTIC TROUBLE CODES P1260 (IMMOBILIZER SYSTEM PROBLEM) AND B1600/B1602 (KEY ID NUMBER CANNOT BE READ) AND/OR U2516 (IC-CAN BUS OFF TRANSMIT ERROR) MAY BE STORED…
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mazda | MAZDA3 | 2004 |
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.
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.