DTC U0029: F-CAN Communication Line Error

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to DLC Circuit Troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Wait for at least 6 seconds.
Check for DTCs with the HDS.
Is DTC U0029 indicated?

YES -Go to step 5.

NO -Intermittent failure, the F-CAN communication line is OK at this time. Check for DTCs in the PCM with the HDS. If F-CAN DTCs are present, check for loose or -poor connections at the gauge control module and the PCM. If the connections are good, check the battery condition and the charging system, then clear all DTCs.
Turn the ignition switch to LOCK (0).
Disconnect the appropriate connector to each control unit in the table one at a time. Clear the DTC, then recheck for DTC's after each unit is disconnected.

Fig 1: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the DTC U0029 indicated after each individual unit was disconnected?

YES -Go to step 7.

NO -Replace the control unit that was disconnected when DTC U0029 did not set.
Turn the ignition switch to LOCK (0).
Disconnect all the control units connectors in the following table.

Fig 2: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the HDS from the data link connector (DLC).
Check for continuity between body ground and gauge control module 32P connector terminals No. 19 and No. 20 individually.

Fig 3: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to ground in the F-CAN wire(s).

NO -Go to next step.
Check for continuity between gauge control module 32P connector terminals No. 19 and No. 20.

Fig 4: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 22 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to ground in the F-CAN wires.

NO -Replace the gauge control module (see Gauge Control Module Replacement ).