2000 GMC 1500 2wd truck. Engine Size : 4.3 lt Question: transmission will not shift into drive and overdrive checked fluid OK i think a shift solenoid tranny is a 4L60-E tell me what else to check there is a check engine lite on do not code for transmission valve or shift solenoid answer my question please.
Transmission model a 4L60-E will not shift into drive and over drive. Transmission fluid is up check engine light is on but have not plugged in code reader yet do not know what the code is Thinking possibly shift solenoid Please send diagram of valve body indicating which solenoid to change Also what is code number pertaining to this problem.
Answer: There is no solenoid that will prevent the transmission from going into any forward gear. Shift solenoids control shift 1-2, 2-3, 3-4 and downshifts. You need to get a scan done on the computer to see what code(s) is set. If it will not go into a forward gear, but will go into reverse, then you have an internal failure such as a valve stuck in the valve body, broken sprag, drum, sunshell, etc. You need to take the trans out and disassemble and look for what has failed.