Powertrain

U0155-LOST COMMUNICATION WITH CLUSTER/CCN

U0155 - Lost Communication With Cluster/CCN:

WHEN MONITORED
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- FCM is configured correctly

SET MONITORED
Bus messages not received from the Cluster/CCN for approximately 2 to 5 seconds.

POSSIBLE CAUSES
- CAN B Bus circuits open or shorted
- DTCs related to battery voltage, ignition, or VIN messages
- FCM not configured correctly
- Cluster/CCN
- Cluster/CCN power and ground
- Module that set the DTC

Diagnostic Test

1. VERIFY DTC IS ACTIVE

NOTE Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Q: Is this DTC active?

YES: Go To 2
NO: Refer to the Stored Lost Communication test procedure. Refer to the table of contents. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
With the scan tool, read active DTCs from all modules.

NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Q: Does the scan tool display any active DTCs to the conditions listed above?

YES: Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. VERIFY THAT THE CCN IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the CCN is active on the bus.

Q: Is the CCN active on the bus?

YES: Go To 4
NO: for No Response diagnostic procedures. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
With the scan tool, select Network Diagnostics.

Q: Is there more than one module with active DTCs "Logged Against" the CCN?

YES: Replace/update the Cluster (CCN) in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace/update the module that set this DTC in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test