DTC U0047: F-CAN B Malfunction (BUS-OFF (PCM))

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For vehicles without the adaptive cruise control (ACC) - if this DTC is stored, do not try to repair the vehicle.
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0047 indicated?

YES -Go to step 4.

NO -Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .
Watch the adaptive cruise control (ACC) indicator.
Does the ACC indicator (amber) stay on?

YES -Check for ACC system DTC, and do the indicated DTC'S TROUBLESHOOTING .

NO -Go to step 5.
Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0047 indicated?

YES -Check for poor connections or loose terminals at the ACC unit and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.

NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .