DTC : U0100, U0122 (Keyless Access Power Control Unit: 9-Speed A/T) (2016 2017 2018)

DTC U0100  : Power Control Unit Lost Communication with PCM

DTC U0122  : Power Control Unit Lost Communication with VSA Modulator-Control Unit (VSA Message)

NOTE: 

• Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
• The DTC may be stored due to the grounding failure or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).

DTC (Power Control Unit)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
• If you have any loss of communication DTCs for the PCM, troubleshoot those DTCs first.

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   Clear DTCs

   - 2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 3. Wait for at least 6 seconds.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Power Control Unit Lost Communication with PCM
   U0122 Power Control Unit Lost Communication with VSA Modulator-Control Unit (VSA Message)

   Are DTC U0100 or U0122 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Open wire check (F-CAN A_H, F-CAN A_L lines)

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

   - 2. Disconnect the following connector.

   Keyless access/TPMS control unit connector C (20P)

   - 3. Jump the SCS line with the HDS, and wait more than 1 minute.

   SCS short

   - 4. Disconnect the transmitting control unit connectors.

   PCM connector A (51P)

   VSA modulator-control unit 38P connector

   - 5. 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 as specified in the table while in the vehicle OFF (LOCK) mode.

   DTC	CIRCUIT NAME	RECEIVING CONTROL UNIT	TRANSMITTING CONTROL UNIT
   U0100 Power Control Unit Lost Communication with PCM	F-CAN A_H	Keyless access/TPMS control unit connector C (20P) No. 2 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018)	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
   	F-CAN A_L	Keyless access/TPMS control unit connector C (20P) No. 12 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018)	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
   U0122 Power Control Unit Lost Communication with VSA Modulator-Control Unit (VSA Message)	F-CAN A_H	Keyless access/TPMS control unit connector C (20P) No. 2 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018)	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)
   	F-CAN A_L	Keyless access/TPMS control unit connector C (20P) No. 12 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018)	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)

   Is there continuity?

   YES 

   The F-CAN A_L to F-CAN A_H wire is OK. Go to step 3.

   NO 

   Repair an open or high resistance in the F-CAN A_H and/or F-CAN A_L wire (S) between the receiving control unit and the transmitting control unit.

3. Determine possible failure area (the receiving control unit or the transmitting control unit)

   -1. Reconnect all connectors.

   - 2. Turn the vehicle to the ON mode.

   - 3. Clear the DTCs with the HDS.

   Clear DTCs

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Power Control Unit Lost Communication with PCM
   U0122 Power Control Unit Lost Communication with VSA Modulator-Control Unit (VSA Message)

   Are DTC U0100 and U0122 indicated?

   YES 

   Check for loose terminals and poor connections in the keyless access/TPMS control unit connector. Check is OK, replace the Keyless Access/TPMS Control Unit - Removal and Installation .

   NO 

   The keyless access/TPMS control unit is OK at this time. Update or replace the transmitting control unit. (Refer to the DTC code shown on the display, and then update or replace the control unit based on the instructions in the table below.)

   DTC	TRANSMITTING CONTROL UNIT
   U0100 Power Control Unit Lost Communication with PCM	Update or replace the PCM ('16-'18 9-Speed A/T) - Removal and Installation .
   U0122 Power Control Unit Lost Communication with VSA Modulator-Control Unit (VSA Message)	Update or replace the VSA Modulator-Control Unit - Removal and Installation .