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P codepowertrainLow severity

P0569Cruise Control Coast Signal

The powertrain control module has detected a fault in the coast (decelerate) button signal from the cruise control switch.

Definition

The PCM or cruise control module monitors the coast/decelerate input from the steering-wheel cruise switch, which is usually one step of a multiplexed resistor-ladder circuit. P0569 sets when the coast signal is present when it should not be, stays active too long, or falls outside its expected voltage range. Typical symptoms are cruise control that will not hold speed, drops speed on its own, or is disabled entirely; the cruise indicator may flash but the MIL usually does not illuminate. The fault is a convenience-system issue and does not affect engine operation or emissions.

Common causes

  • Worn or sticking coast/decel button in the steering-wheel cruise switch assembly
  • Faulty clockspring (spiral cable) carrying the switch signal through the steering column
  • Corroded or damaged wiring/connector between the switch and the PCM or cruise module
  • Liquid intrusion into the switch pad causing incorrect resistance values
  • Short to ground or to an adjacent circuit in the multiplexed switch signal wire
  • Failed cruise control module or PCM input (rare)

Common misdiagnoses

  • Replacing the brake light switch when the coast input is the actual fault
  • Replacing the cruise control actuator/servo on cable-actuated systems
  • Replacing the vehicle speed sensor
  • Replacing the entire steering-wheel airbag/switch assembly when only the clockspring is open

Troubleshooting steps

  1. 1.Read live data for the cruise switch inputs

    With a scan tool, watch the cruise switch status PIDs while pressing each button; the coast input should toggle only when the coast button is pressed.

  2. 2.Measure the switch signal voltage at the module

    Back-probe the multiplexed switch input and confirm each button produces its distinct voltage step per the service manual (each button switches a different resistor into the circuit).

  3. 3.Test the switch resistance ladder directly

    Disconnect the switch and ohm each button position against the resistance chart; a stuck coast button reads its in-circuit value with no button pressed.

  4. 4.Check the clockspring continuity

    Verify continuity through the spiral cable while turning the wheel lock-to-lock; intermittent opens with steering movement indicate a failing clockspring.

  5. 5.Inspect wiring and connectors

    Look for chafed insulation, water intrusion, and bent terminals between the column connector and the PCM/cruise module.

  6. 6.Clear the code and verify the repair

    Road test with cruise engaged, use the coast function several times, and confirm the code does not reset.

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