DTC P0651

DTC P0651  : Sensor Reference Voltage 2 Circuit Malfunction

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, and wait for several seconds.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0651 Sensor Reference Voltage 2 Circuit Malfunction

   Is DTC P0651 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 sensor unit 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. Open wire check (VCC1, SG1 lines)

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

   - 2. Disconnect the following connectors.

   TCM subharness 26P connector

   TCM 58P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	TCM subharness 26P connector: disconnected
   	TCM 58P connector: disconnected
   Test point 1	TCM subharness 26P connector No. 15
   Test point 2	TCM 58P connector No. 10 - Refer to: A/T Control System Connector for Inputs and Outputs (2016 2017 2018), or A/T Control System Connector for Inputs and Outputs (2019), or A/T Control System Connector for Inputs and Outputs (2020 2021) .

   Test point 1	TCM subharness 26P connector No. 17
   Test point 2	TCM 58P connector No. 8 - Refer to: A/T Control System Connector for Inputs and Outputs (2016 2017 2018), or A/T Control System Connector for Inputs and Outputs (2019), or A/T Control System Connector for Inputs and Outputs (2020 2021) .

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VCC1 and SG1 wires are not open. Go to step 3.

   NO 

   Repair an open in the VCC1 and/or SG1 wire between the sensor unit and the TCM.

3. Shorted wire check (VCC1 line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	TCM subharness 26P connector: disconnected
   	TCM 58P connector: disconnected
   Test point 1	TCM 58P connector No. 10 - Refer to: A/T Control System Connector for Inputs and Outputs (2016 2017 2018), or A/T Control System Connector for Inputs and Outputs (2019), or A/T Control System Connector for Inputs and Outputs (2020 2021) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the VCC1 wire between the sensor unit and the TCM.

   NO 

   The VCC1 wire is OK. Replace the sensor unit .