641-998
NOTEKOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.
DTC 641
Shift Solenoid 3 circuit failure.
KOEO Hard Code Go to TC1
TC1 - Enter Output State Diagnostic Test Mode
DTC 643
Torque Converter Clutch circuit failure.
KOEO Hard Code Go to TC20
TC20 - Key On Engine Off Service Code 621/622/641/643
KOEO Memory Code Go to TC30
TC30 - Visually Check Shift Solenoid Harness
DTC 645
Incorrect gear ratio obtained for first gear.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 646
Incorrect gear ratio obtained for second gear.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 647
Incorrect gear ratio obtained for third gear.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 648
Incorrect gear ratio obtained for fourth gear.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 649
Electronic Pressure Control higher or lower than expected.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 651
Electronic Pressure Control circuit failure.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 652
Torque Converter Clutch solenoid circuit failure.
KOEO Hard Code Go to TC1
TC1 - Enter Output State Diagnostic Test Mode
DTC 653
Transmission Control Switch did not change states during KOER self-test.
KOER Hard Code Go to TB2
TB2 - Diagnostic Trouble Codes 65, 632 and 653
DTC 654
Transmission Range sensor not indicating "PARK" during KOEO self-test.
KOEO Hard Code Go to TD1
TD - Manual Lever Position (MLP) Sensor
DTC 656
Torque Converter Clutch continuous slip error.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 657
Transmission over temperature condition occurred.
KOEO Memory Code Go to TE100
TE100 - Rerun KOEO Self Test
DTC 659
High vehicle speed in park indicated.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 667
Transmission Range sensor circuit voltage below minimum voltage.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 668
Transmission Range circuit voltage above maximum voltage.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 675
Transmission Range sensor circuit voltage out of range. Hard fault present, vehicle is in Failure Mode Effects Management (FMEM).
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 676
Go to Transmission and Drivetrain / Testing and Inspection.
DTC 677
Go to Transmission and Drivetrain / Testing and Inspection.
DTC 691
KOEO Memory Code Go to TB1
TB1 - Diagnostic Trouble Codes 47, 633 and 691
DTC 998
KOEO Hard Code Go to TC10
TC10 - Check VPWR to Solenoid
NO DTCs LISTED
Go to QA1
QA1 - Check VREF Voltage At Self-Test Connector