DTC U0155 (A/T System (Without CAN Gateway)) (2016 2017 2018 2019 2020)

DTC U0155  : F-CAN Malfunction (TCM-Gauge Control Module)

DTC (A/T)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode.

   - 5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   U0155 F-CAN Malfunction (TCM-Gauge Control Module)

   Is DTC U0155 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the gauge control module and the TCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Gauge control module DTC check

   - 1. Check for gauge control module DTCs with the HDS.

   DTC Description	DTC
   U0029 F-CAN communication line error
   U0100 Gauge control module lost communication with ENG/AT

   Is DTC U0029 and/or U0100 indicated?

   YES 

   Go to step 3.

   NO 

   Do the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (2017 2018 2019 2020), or Gauges Self-Diagnostic Function (2016) .

3. Open wire check (F-CAN A_H line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connectors.

   Gauge control module 32P connector

   TCM 58P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Gauge control module 32P connector: disconnected
   	TCM 58P connector: disconnected
   Test point 1	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020), or Gauge Control Module Input Test (2016)
   Test point 2	TCM 58P connector No. 34

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN A_H wire between the gauge control module and the TCM.

4. Open wire check (F-CAN A_L line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Gauge control module 32P connector: disconnected
   	TCM 58P connector: disconnected
   Test point 1	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020), or Gauge Control Module Input Test (2016)
   Test point 2	TCM 58P connector No. 47

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Substitute a known-good gauge control module , then recheck. If this DTC goes away and the gauge control module was substituted, replace the original gauge control module .

   NO 

   Repair an open in the F-CAN A_L wire between the gauge control module and the TCM.