Transfer Case

Electronic Locking Differential (ELD) System

Pinpoint Test U: DTC U0155:00

Normal Operation

- DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub-Type Information)- sets in continuous memory in the Transfer Case Control Module (TCCM) if data messages received from the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or longer. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- TCCM (Transfer Case Control Module)

- IPC (Instrument Panel Cluster)

PINPOINT TEST U : DTC U0155:00

U1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to U2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

U2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Network Test.

- Carry out the network test.

Does the IPC (Instrument Panel Cluster) pass the network test?

Yes
GO to U3.

No
REFER to Information Bus.

U3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
REFER to Instrument Panel, Gauges and Warning Indicators.

No
GO to U4.

U4 RETRIEVE THE RECORDED DTCs FROM THE TCCM (Transfer Case Control Module) SELF-TEST

- Check for recorded DTCs from the TCCM (Transfer Case Control Module) self-test.

Is DTC P0562:00 or DTC P0563:00 recorded?

Yes
GO to Pinpoint Test G Pinpoint Test G: DTCs P0562:00 and P0563:00.

No
GO to U5.

U5 RECHECK THE TCCM (Transfer Case Control Module) DTCs

- Clear the DTCs.

- Wait 10 seconds.

- Repeat the TCCM (Transfer Case Control Module) self-test.

Is DTC U0155:00 still present?

Yes
GO to U6.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

U6 CHECK FOR DTC U0155:00 SET IN OTHER MODULES

- Clear all DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self-Test.

- Retrieve the continuous memory DTCs from all modules.

Is DTC U0155:00 set in the Body Control Module (BCM), Restraints Control Module (RCM), or Driver Door Module (DDM)?

Yes
INSTALL a new IPC (Instrument Panel Cluster). TEST the system for normal operation.

No
INSTALL a new TCCM (Transfer Case Control Module). REFER to Transfer Case Control Module (TCCM) . TEST the system for normal operation. REPEAT the self-test.