TM 9-2320-280-20-1
REFERENCE INFORMATION
TRANSMISSION SYSTEM
(4L80-E)
The following chart will help you find the code you need. The J1 cable diagnostics checks (page 2-428) must
be performed. Always correct the lower code number first. If code 51 shows up, replace TCM (para. 4-42),
operate vehicle, and recheck for trouble codes.
TROUBLE CODE
21
22
24
28
37
38
39
51
52
53
58
59
68
69
71
73
74
75
79
81
82
83
85
86
87
CIRCUIT
Throttle Position High
Throttle Position Low
Transmission Output Speed Sensor (TOSS)
Transmission Range Pressure Switch
Torque Converter Clutch (TCC) Brake Switch Stuck “ON”
TCC Brake Switch Stuck “OFF”
TCC Stuck “OFF”
Transmission Control Module (TCM) Bad
System Voltage High Long
System Voltage High
Transmission Temperature High
Transmission Temperature Low
Transmission Component Slipping
Torque Converter Clutch (TCC) Stuck “ON”
Engine Speed Sensor Circuit Low
Pressure Control Solenoid (PCS) Current
Transmission Input Speed Sensor (TISS) Circuit
System Voltage Low
Transmission Fluid Overtemp
2-3 Shift Solenoid Circuit Fault
1-2 Shift Solenoid Circuit Fault
TCC Solenoid (PWM) Circuit Fault
Undefined Ratio
Low Ratio
High Ratio
PAGE NO.
2-422
2-422
2-422
2-422
2-422
2-422
2-423
2-423
2-423
2-423
2-423
2-423
2-424
2-424
2-424
2-424
2-425
2-425
2-425
2-425
2-426
2-426
2-426
2-427
2-427
2-421
