The P0569 code on your 2019 Buick Enclave indicates a malfunction in the cruise control coast or deceleration signal circuit. This function allows decreasing set speed while cruise is engaged.
Coast/Decel Function
The coast function lets you reduce your cruise set speed gradually. Similar to resume/accel, a quick press may decrease speed by 1 mph while holding reduces continuously. This allows fine-tuning speed without disengaging cruise.
Enclave Cruise Control
The 2019 Buick Enclave features cruise control with steering wheel-mounted controls. The coast/decel function is part of the integrated cruise control switch assembly used for managing speed on family trips.
Signal Issues
The coast/decel switch may have failed. The switch might be stuck preventing signal change. Circuit wiring may be damaged. Clock spring issues affect this specific circuit. The switch may work intermittently due to wear.
Diagnostic Steps
Use GM GDS2 to monitor coast/decel signal. Test both tap (1 mph decrease) and hold (continuous decrease) functions. Verify the switch clicks and returns mechanically. Check circuit continuity through the clock spring. Look for corroded or damaged connections.