Don’t shift from 2-3 to overdrive (4)
Any codes present. The transmission codes would help to pin point the issue. There could be a faulty sensor such as the VSS or an open/short in one of the shift solenoid circuits. It could be as simple as a failed shift solenoid. But if you had the codes it would tell you exactly which one/s.
Transmission Controls – 4L60E 2001 Chevy Suburban
