OBD-I Transmission Codes			© shbox.com
DTC	Description	Code Parameters	Default Action
14	Engine Coolant Temperature  Sensor Circuit (high)	Engine coolant temp over 151ºC(306ºF) for 1/2 second	*TCC apply cold
15	Engine Coolant Temperature  Sensor Circuit (low)	Engine coolant temp less than -40ºC (-40ºF) 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 151ºC (306ºF) for one second	*No default action
59	Transmission Fluid Temp Sensor Circuit (low)	Transmission fluid temperature is below -40ºC (-40ºF) 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 146ºC (302ºF) 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