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HI,Ok, first check the 4 pin connector on top of transmission to make sure it is connected securely. Next on the red connector to the ECM, check continuity or pins 51 and 33. Repair short if required. If continuity is ok, then replace the TCC solenoid. Most of the time it is the TCC solenoidPlease note, your Deposit doesn't constitute a payment. Please be sure to rate OK SERVICE, GOOD SERVICE OR EXCELLENT SERVICE to complete transaction or ask for more help by clicking REPLY TO EXPERT. Positive feedback is always appreciated. Bonuses are welcome. Please note that if you have a subscription service you still need to to rate OK SERVICE, GOOD SERVICE OR EXCELLENT SERVICE , however you are not charged again. Thank you.Please note the 1 to 2 faces(POOR AND BAD SERVICE) are a negative rating. Before choosing one of these, please reply first so that I can further help you
Ok the TCC solenoid on these gm trans (4L30E) are the same as the shift solenoid right? When i looked up the napa part i came up with no description other than "A/Trans Solenoid"...
It took some time to get back to the truck but i did test 51 and 33 and there is no continuity between them. If i understand you correctly that is what i am supposed to find? I went ahead and replaced the solenoid and reset the ecm and the code came back on in a matter of a few miles. No drive-ability issues though, it shifts fine.