Cadillac Escalade EXT not shifting out of 2nd gear with a top speed of 35 mph, unresolved by dealer and outside mechanic on Cadillac Escalade EXT

Some Cadillac Escalade EXT owners report experiencing serious transmission issues, such as the vehicle not shifting out of 2nd gear and being limited to a top speed of 35 mph. This problem can stem from various causes, including misaligned throttle position sensors, malfunctioning shift solenoids, or general wear associated with higher mileage. In instances where drivers notice a loss of 3rd and 4th gears, erratic shifting, or slipping above 30 mph, some have found that cleaning the 2-3 shift valve and related components may help. Additionally, slipping out of gear or delays in shifting can indicate significant transmission trouble, often resulting in a sudden increase in engine RPM without a corresponding speed increase. To accurately diagnose the issue, it is advisable for owners to have their vehicle scanned with a dealer-compatible scanner to retrieve error codes, which can clarify whether the problem is electrical or internal to the transmission. Resetting the system by disconnecting the battery terminals may also be attempted. Given the complexity of these transmission problems, thorough investigation by both dealers and independent mechanics is essential to identify and resolve the underlying issues.