No first and occasional p0758

[05grndprix]

cars a 97 gtp with the 4t65e.... woke up this morning with no first gear... last week and 2 times this afternoon the p0758 code came up which is 2-3 shift solenoid circuit electrical... when that code comes up i lose 4th and the first time it happened when i had first i lost 1st too... when i deleted the code the first time i regained 1st and 4th... woek up this morning and no first but had 4th with no code... just a minute ago the code came up 2 times on the way home lost 4th both times had hptuner hooked up and delted the code and 4th came back right away but first is gone and has been gone with or without the code... any ideas???

[05grndprix]

where is trannyman??? no answers at all???... wanted to get an idea before i start ripping things apart to find out its a wire or something after the trans is out

[GMR Badass]

Trannyman doesn't need to be here to answer this one. There really is not temporary fix for your situations. Shift solenoid is failing and probably more inside the trans. If you want to diagnose further you can but it's a waste of time. I know that you say that your code was with the 2-3 but with the chart listed below I would say that your issue is more with the 1-2 solenoid.

Taken straight from Triple Edge Performance - Home Page ....you can use the chart to determine function with using a multimeter.

Connect Pins Solenoid Resistance at 68*F 190*F
A-E 1-2 Shift Solenoid 19-24 24-31
B-E 2-3 Shift Solenoid 19-24 24-31 T-E TCC/PWM Solenoid 10-12 13-15 C-D EPC Solenoid 3-5 5-6 S-V Input Speed Sensor 893-1127 1132-1428 M-L TFT Sensor 3164-3867 225-285
Output Speed Sensor 981-1864

Shift Solenoid Patterns for each gear
Range 1-2 Solenoid 2-3 Solenoid
Park ON ON
Reverse ON ONNeutral ON ON
1st Gear ON ON
2nd Gear OFF ON
3rd Gear OFF OFF
4th Gear ON OFF

[05grndprix]

Trans was just built 10k ago and this was a problem when it happened... Both solenoids were replaced .. Just awkward its only 1st i lost completely... Oh well fix it Tuesday again

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