Chevrolet C2500 intermittent power loss to transmission with erratic speedometer and ABS light activation on Chevrolet C2500

Some Chevrolet C2500 owners report experiencing intermittent power loss to the transmission, erratic speedometer behavior, and activation of the ABS light. These issues may stem from a faulty ignition coil that emits radio frequency interference, potentially triggering the ABS module. Additionally, a malfunctioning transmission output speed sensor, which operates independently of the ABS wheel sensors, could be a contributing factor. Problems with the ignition switch may also lead to voltage drops that affect various systems, including the ABS. Furthermore, some owners find that the dashboard meter inaccurately measures only battery voltage, failing to provide specific readings for other systems. To address these concerns, it is advisable to check for a faulty ignition coil, inspect the transmission output speed sensor, test the ignition switch for voltage drop issues, and verify the accuracy of dashboard meter readings by checking the supply and ground wires at the BCM and cluster.