DTC Troubleshooting: P0651
DTC P0651: Sensor Reference Voltage 2 Circuit Malfunction
NOTE:
Before you troubleshoot, review the General Troubleshooting Information.
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

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

1.
Problem verification:

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
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 TCM and the following parts. 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.?
CVT speed sensor
Torque converter turbine speed sensor
2.
Determine possible failure area (VCC lines, others):

Determine possible failure area (VCC lines, others)
?1.
Clear the DTC with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode.

?3.
Disconnect the following connectors.
CVT speed sensor 3P connector
Torque converter turbine speed sensor 3P connector

?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
P0651 Sensor Reference Voltage 2 Circuit Malfunction
      

Is DTC P0651 indicated?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 3.
3.
Shorted part check:

Shorted part check
?1.
Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
CVT speed sensor
Torque converter turbine speed sensor

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

Is DTC P0651 indicated?

     
YES
     
     
     
Replace the part that caused the DTC when it was reconnected.?
     
NO
     
     
     
Check for poor connections and loose terminals at the TCM and the following parts, then go to step 1.
CVT speed sensor
Torque converter turbine speed sensor
4.
Shorted wire check (VCC lines to ground):

Shorted wire check (VCC lines to ground)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
TCM 50P connector

?3.
Check for continuity between these test points and body ground individually.
Test condition
Vehicle OFF (LOCK) mode
 
CVT speed sensor 3P connector: disconnected
 
Torque converter turbine speed sensor 3P connector: disconnected
 
TCM 50P connector: disconnected

Connector
Terminal
TCM 50P connector
No. 21
No. 41

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the VCC wire between the TCM and each part that was disconnected in step 2.?
     
NO
     
     
     
Go to step 5.
5.
Shorted wire check (VCC lines to power):

Shorted wire check (VCC lines to power)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between these test points and body ground individually.
Test condition
Vehicle ON mode
CVT speed sensor 3P connector: disconnected
Torque converter turbine speed sensor 3P connector: disconnected
TCM 50P connector: disconnected

Connector
Terminal
TCM 50P connector
No. 21
No. 41

Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the VCC wire between the TCM and each part that was disconnected in step 2.?
     
NO
     
     
     
The VCC wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good TCM, then recheck. If this DTC goes away and the TCM was substituted, replace the original TCM.?