What does it mean?
B2406 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Steering Unit Communication. (PTC operate) .
Symptoms
- The CD source reports an error, will not load a disc or will not eject one
- The head unit resets itself or freezes while other sources still work
- Mechanical noise comes from the slot when a disc is inserted
- An internal error message is shown on the display
- Radio and auxiliary inputs work normally while only the disc section is dead
Likely causes
- Mechanical failure of the disc loading mechanism inside the head unit
- Dirty or worn laser pickup that can no longer track a disc
- Disc jammed in the transport or a second disc inserted on top of the first
- Internal board failure, often following a supply spike or moisture exposure
- Corrupted head unit software after an interrupted power supply
- Internal ribbon connections damaged by vibration
- Foreign object pushed into the disc slot
How to fix it
- Test with a known good original disc to rule out a marked or copied disc
- Carry out the forced eject or reset routine specified for this unit
- Check the slot for a second disc or a foreign object
- Verify the constant and switched supplies plus the ground at the head unit connector, including the relevant fuses
- Reset the unit by removing power for a short period, then retest
- Update or reload the head unit software where the manufacturer supports it
- Replace or repair the head unit once the mechanism or main board is confirmed at fault, and enter any security code afterwards