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code p0711 refers to transmission fluid temperature (TFT) sensor--range/performance problem===causes--wiring TFT sensor
code p0713 refers to TFT sensor --high input--===causes --wiring short to positive--TFT sensor---ECM/TCM. If you can get to the TFT sensor, Then you can do it your self
P0710 DTC Detection Condition: Either (a) or (b) is detected for 0.5 sec. or more: (1 trip detection logic) (c) Temp. sensor resistance is less than 79 W (d) After engine has been operating for 15 min. or more, resistance at temp. sensor is more than 156 kW
1. Open or short in ATF temp. sensor 2. ATF temp. sensor 3. ECM
P0711 DTC Detection Condition: Both (a) and (b) are detected: (2 trip detection logic) (a) After 12 sec. of engine start, temp. of atmosphere and that of engine coolant is more than -10°C (b) After normal driving for over 20 min. and 10 km, ATF temp. is less than 10°C
Trouble Area: 1. Open in ATF temp. sensor 2. ATF temp. sensor 3. ECM
three things can trigger codes, an actual malfunction of the sensor, a loose timing belt (cam sensor) wiring problems like a defective sensor connector or wiring to the connector and a defective engine control computer, so just throwing part at the problem is very unwise, have GM dealer diagnose the codes and then based on the results you decide what you want to try and replace and what u think is above your skill level and better left to a professional technician.
po121 means that there is a problem with the throttle position sensor ( tps). or in the wiring or connector, most likely its the tps that is bad. first remove connection from tps, heres how to test. use an ohms meter and hook a lead to top or bottom terminal of tps. use other probe on center terminal of tps. move throttle plate slowly, if the needle on meter does not move at a smooth pace, then tps is bad. good-luck!!
113 is the IAT (inlet air temp) sensor reading is above maximum voltage -40 deg indicated. This is the sensor that is in the air tube from the air filter box to the throttle body. It will have a black 2 wire connector. This is usually and open ckt like sensor unplugged.
635 is not a good code but the 600 series codes are transmission codes. However if it is a code 637 maybe, then that would make sense because that would be a trans fluid temp exceeds maximum voltage indicated -40 deg and both of these sensors share the same circuit in the GY/R wire,this is the signal return.
If this is the case you may have a broken wire so I would try and overlay that circuit from pin 46 of the PCM to the IAT sensor first and see if that corrects the 113 and it may also back feed that ckt and clear the other code also.