DTC U0100, U0101, U0122, U0127, U0128, U0131, U0151 (Gauge Control Module without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)

DTC U0100  : Gauge Control Module Lost Communication with ENG/AT DTC U0101  : Gauge Control Module Lost Communication with AT DTC U0122  : Gauge Control Module Lost Communication with VSA Modulator-Control Unit DTC U0127  : Gauge Control Module Lost Communication with TPMS Control Unit (Body Control Module)DTC U0128  : Gauge Control Module Lost Communication with EPB DTC U0131  : Gauge Control Module Lost Communication with EPS Unit DTC U0151  : Gauge Control Module Lost Communication with SRS Unit

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• Before you troubleshoot, review the general troubleshooting information .
• According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the gauge control module.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC (Gauge Control Module)

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 and then the ON mode.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Gauge Control Module Lost Communication with ENG/AT
   U0101 Gauge Control Module Lost Communication with AT
   U0122 Gauge Control Module Lost Communication with VSA Modulator-Control Unit
   U0127 Gauge Control Module Lost Communication with TPMS Control Unit (Body Control Module)
   U0128 Gauge Control Module Lost Communication with EPB
   U0131 Gauge Control Module Lost Communication with EPS Unit
   U0151 Gauge Control Module Lost Communication with SRS Unit

   Are any DTCs indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units and the gauge control module.

2. Open wire check (F-CAN A H line, F-CAN A L line)

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

   -2. Disconnect the receiving control unit connector.

   Gauge control module connector A (32P)

   -3. Disconnect the transmitting control unit connector (s).

   Refer to the DTC shown on the display, then disconnect the connector (s) based on the instructions (see table).

   U0100: Jump the SCS line with the HDS, and wait more than 1 minute.

   U0151: Do the 12 volt battery terminal disconnection procedure , and wait for at least 3 minutes.

   DTC	Connector
   U0100	PCM connector A (50P)
   U0101 *1	TCM 58P connector

   *1: 9-speed A/T

   *2: 10-speed A/T

   DTC	Connector
   U0101 *2	TCM connector A (23P)
   U0122U0128	VSA modulator-control unit 46P connector
   U0127	Body control module connector B (36P)
   U0131	EPS control unit connector B (6P)
   U0151	SRS unit connector A (39P)

   *1: 9-speed A/T

   *2: 10-speed A/T

   -4. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN A H circuit and the F-CAN A L circuit.

   Test condition

   Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected Transmitting control unit connector (s) for indicated DTCs: disconnected

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   U0100	F-CAN A H	Gauge control module connector A (32P)	No. 19	PCM connector A (50P)	No. 11
   	F-CAN A L		No. 20		No. 10
   U0101 *1	F-CAN A H	Gauge control module connector A (32P)	No. 19	TCM 58P connector	No. 34
   	F-CAN A L		No. 20		No. 47
   U0101 *2	F-CAN A H	Gauge control module connector A (32P)	No. 19	TCM connector A (23P)	No. 19
   	F-CAN A L		No. 20		No. 18
   U0122U0128	F-CAN A H	Gauge control module connector A (32P)	No. 19	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A L		No. 20		No. 21
   U0127	F-CAN A H	Gauge control module connector A (32P)	No. 19	Body control module connector B (36P)	No. 22
   	F-CAN A L		No. 20		No. 23
   U0131	F-CAN A H	Gauge control module connector A (32P)	No. 19	EPS control unit connector B (6P)	No. 3
   	F-CAN A L		No. 20		No. 4
   U0151	F-CAN A H	Gauge control module connector A (32P)	No. 19	SRS unit connector A (39P)	No. 34
   	F-CAN A L		No. 20		No. 35

   *1: 9-speed A/T

   *2: 10-speed A/T

   Is there continuity?

   YES 

   The F-CAN A H wire and the F-CAN A L wire are OK. Refer to the DTC shown on the display, then substitute or replace the control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   U0100	Substitute a known-good PCM , then recheck. If DTC U0100 goes away after substitution, replace the original PCM .
   U0101 *1	Substitute a known-good TCM , then recheck. If DTC U0101 goes away after substitution, replace the original TCM .
   U0101 *2	Substitute a known-good TCM , then recheck. If DTC U0101 goes away after substitution, replace the original TCM .
   U0122U0128	Replace the VSA modulator-control unit .
   U0127	Substitute a known-good body control module , then recheck. If DTC U0127 goes away after substitution, replace the original body control module .
   U0131	Substitute a known-good EPS control unit , then recheck. If DTC U0131 goes away after substitution, replace the original EPS control unit .
   U0151	Substitute a known-good SRS unit , then recheck. If DTC U0151 goes away after substitution, replace the original SRS unit .

   *1: 9-speed A/T

   *2: 10-speed A/T

   NO 

   Repair an open in the F-CAN A H wire and/or the F-CAN A L wire between the gauge control module and the transmitting control unit.