DTC B2772: Control Module Communication Stuck

DTC detecting condition: 

When all the following conditions are met.

• Battery voltage stays at 10 V or more for longer than one second.
• CAN bus is not in sleep state.
• Clear memory is not in process.
• CAN message register freezes in the TPMS & keyless entry control module or the keyless entry control module

Trouble symptom: 

• Communication is impossible with Subaru Select Monitor.
• Lock/unlock cannot be operated with keyless entry.

1. CHECK DTC  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TPMS & keyless entry control module connector or keyless entry control module connector.
   3. Connect the disconnected connectors.
   4. Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. Ref. to COMMON (diag)>CLEAR MEMORY .
   5. Turn the ignition switch to OFF.
   6. Turn the ignition switch to ON.
   7. Read the DTC of [Keyless Entry] using the Subaru Select Monitor. Ref. to KEYLESS ENTRY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2772 displayed? (Current malfunction)

   Yes  : Replace the TPMS & keyless entry control module or keyless entry control module. Ref. to SECURITY AND LOCKS>KEYLESS ENTRY CONTROL MODULE .

   No  : Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.