A P0571 code on your 2019 Ram 2500 indicates a malfunction in the brake switch circuit. On heavy-duty trucks, this switch is essential for cruise control, exhaust brake control, and towing safety functions.
Heavy-Duty Brake Switch Functions
The Ram 2500's brake switch serves multiple purposes: disengaging cruise control, controlling exhaust brake operation (on diesel models), signaling the trailer brake controller, and allowing shift from park. Malfunction affects these important work truck features.
Diesel and Gas Considerations
The 2019 Ram 2500 offers the 6.4L HEMI gas engine or 6.7L Cummins diesel. Diesel models with exhaust brakes rely heavily on brake switch input for proper integration between engine braking and service brakes.
Switch Malfunction Sources
The brake switch may have worn from heavy use. Corrosion from environmental exposure (work truck conditions). Wiring damage from vibration or payload contact. Connector issues from underhood heat. Misadjustment affecting proper activation point.
Diagnostic Process
Use wiTECH to monitor brake switch status during pedal operation. Test all brake-dependent functions: cruise cancel, exhaust brake operation, brake lights. Check switch adjustment—heavy trucks may need different specifications. Inspect wiring routing for damage from engine vibration or contact with other components.