GMC Jimmy transmission shifting issues and speedometer failure due to damaged speed sensor wiring on GMC Jimmy

Some GMC Jimmy owners report experiencing transmission shifting issues and speedometer failure due to damaged speed sensor wiring. These problems can lead to inaccuracies in speed readings, making it difficult for drivers to monitor their vehicle's speed effectively. Additionally, the damaged wiring can cause harsh shifting, delayed gear changes, or sudden shifts between gears, indicating potential transmission complications. To accurately diagnose these issues, owners are advised to monitor the Powertrain Control Module (PCM) with a scanner and pay close attention to the Vehicle Speed Sensor (VSS). In some cases, a faulty solenoid may prevent the PCM from commanding a shift without triggering a code, highlighting the need for thorough diagnosis and repair to ensure the smooth operation of the vehicle.