DTC B2772: Control Module Communication Stuck

DTC detecting condition:

When the following conditions are all met.

Battery voltage remains at 10 V or more for 1 second or more.
CAN bus is not in sleep state.
Clear memory is not in progress.
CAN message register freeze in TPMS & keyless entry control module.

Trouble symptom:

Not communicable with Subaru Select Monitor.
Lock/unlock cannot be operated with keyless entry.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to KEYLESS ENTRY (DIAGNOSTICS)>General Description>CAUTION .

CHECK DTC .

Turn the ignition switch to OFF.
Disconnect the TPMS & keyless entry control module connector.
Connect the disconnected connectors.
Using the Subaru Select Monitor, perform the clear memory for «Keyless Entry». Ref. to KEYLESS ENTRY (DIAGNOSTICS)>Clear memory .
Turn the ignition switch to OFF.
Turn the ignition switch to ON.
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. Ref. to WHEEL AND TIRE SYSTEM>TIRE PRESSURE MONITORING SYSTEM .

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, there was a temporary poor contact in the connector, temporary open or short circuit in the harness, or temporary access error of EEPROM.