OBD-I Transmission Codes shbox.com
DTC Description Code Parameters Default Action
14 Engine Coolant Temperature Sensor Circuit (high) Engine coolant temp over 151C(306F) for 1/2 second *TCC apply cold
15 Engine Coolant Temperature Sensor Circuit (low) Engine coolant temp less than -40C (-40F) for 1/2 second *TCC apply cold
21 Throttle Position Sensor
Circuit (high)
TP voltage greater than 4.88 volts for four seconds *No TCC
*Fixed shift points
*Harsh shifts
*Maximum line pressure
*No fourth gear in hot mode
22 Throttle Position Sensor
Circuit (low)
With engine running, TP voltage less than .06 volts for four seconds *No TCC
*Fixed shift points
*Harsh shifts
*Maximum line pressure
*No fourth gear in hot mode
24 Vehicle Sensor Circuit
No signal
In Drive or Reverse with engine speed greater than 3000 rpm, output speed is less than 250 rpm for three seconds.
(MAP is 100-255 kPa, TP is 10-100%)
*Maximum line pressure
*Third gear only
28 Trans. Range Pressure Switch
Circuit error
PCM detects one of two "invalid" combinations of PSM signals for five seconds. *No TCC
*Harsh shifts
*No fourth gear in hot mode
*No 2nd gear in D2
37 Brake Switch Stuck "ON" With brake on, vehicle speed is 5-20 mph for six seconds, then vehicle speed is >20 mph for six seconds. After vehicle speed is <5 mph. This must happen seven times. *No TCC
*No fourth gear in hot mode
38 Brake Switch Stuck "OFF" With brake off, vehicle speed is >20 mph for six seconds, then vehicle speed is 5-20 mph for six seconds. After vehicle speed is <5 mph. This must happen seven times. *No TCC
*No fourth gear in hot mode
53 System Voltage Overcharged Generator voltage is greater than 19.5 volts for two seconds *No TCC
*Maximum line pressure
*Third gear only
58 Transmission Fluid Temp Sensor Circuit (high) Transmission fluid temperature is greater than 151C (306F) for one second *No default action
59 Transmission Fluid Temp Sensor Circuit (low) Transmission fluid temperature is below -40C (-40F) for one second *No default action
72 Vehicle Speed Sensor Error Two successive speed readings have a difference fo more than 1000 rpm. (Difference must be more than 1500 rpm in P and N) *Maximum line pressure
*Soft landing third gear only
*No TCC
73 Pressure Control Solenoid Current Pressure control solenoid return amperage varies more than .06 amp from commanded amperage for one second. *Harsh shifts
*Maximum line pressure
74 TCS/ASR Circuit Low ASR active for five seconds *Inhibit TCC operation
*Inhibit 4th gear, if in hot mode
75 System Voltage Low System voltage is less than 7.3 volts at low temps and less than 11.7 volts at high temps for four seconds *No TCC
*Maximum line pressure
*Third gear only
79 Transmission Fluid Overtemp Transmission temp is higher than 146C (302F) for 30 minutes *No default action
81 2-3 Shift Solenoid Circuit Fault 2-3 shift solenoid is commanded ON by PCM but circuit voltage is high for two seconds
OR
2-3 shift solenoid is commanded OFF by PCM but circuit voltage is low for two seconds
*No TCC
*Maximum line pressure
*Second or third gear only
82 1-2 Shift Solenoid Circuit Fault 1-2 shift solenoid is commanded ON by PCM but circuit voltage is high for two seconds
OR
1-2 shift solenoid is commanded OFF by PCM but circuit voltage is low for two seconds
*Maximum line pressure
*Second or third gear only
OR
*First and fourth gears only
83 TCC PWM Solenoid Circuit Fault The PCM commands the solenoid ON and voltage remains high (B+) for two seconds
OR
The PCM commands the solenoid OFF and voltage remains low (zero volts) for two seconds
*Inhibit TCC operation
*Inhibit 4th gear operation
84 3-2 Control Solenoid Circuit Fault At high duty cycle, the circuit voltage high
OR
at low duty cycle the circuit voltage is low for four seconds
*Third gear only
*Soft landing to third gear
85 TCC Stuck ON With gear selector in a drive range, transmission in 2nd, 3rd or 4th, TP sensor greater than 25% and TCC unlocked - slip is between -20 and 20 rpm *TCC ON in all gears
*Early shifts
90 TCC Solenoid Circuit Fault TCC is commanded on, but circuit is high
OR
TCC is commanded off but circuit voltage is low for two seconds
*No TCC
*No fourth gear in hot mode