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DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P056A

P056ACruise Control Increase Distance Signal

P056A indicates that the cruise control system has detected an implausible or missing signal from the increase distance (set speed increase) button on the steering wheel or stalk. The computer expects a specific voltage or resistance when the button is pressed, but the value it sees does not match the stored profile, so it sets this code and may disable cruise control.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Cruise control does not engage or disengage when the increase distance button is pressed
  • The cruise control indicator light may flash or stay off entirely
  • Other steering wheel buttons (horn, audio, or other cruise functions) may work intermittently or not at all
  • Often no symptoms besides the warning light, especially if the fault is intermittent
  • The set speed may not increase when the button is held, or it may jump erratically
  • A related message may appear in the driver information center, such as 'Cruise Control Unavailable'

Common causes, most likely first

  1. Faulty increase distance switch inside the steering wheel button cluster
  2. Worn or damaged clock spring (spiral cable) in the steering column
  3. Corroded or loose electrical connector at the switch or clock spring
  4. Open or shorted wire in the cruise control switch circuit
  5. Failing cruise control module or body control module (BCM) that processes the switch signal
  6. Aftermarket steering wheel or radio installation that disturbed the switch wiring

How to diagnose and fix it

  1. Use a scan tool to read live data from the cruise control switch and confirm whether the increase distance button registers correctly
  2. Inspect the steering wheel button cluster and connectors for physical damage, corrosion, or loose pins
  3. Test the clock spring continuity with a multimeter while turning the steering wheel through its range
  4. Check the cruise control switch circuit for opens, shorts, or excessive resistance between the switch and the control module
  5. If the switch or clock spring tests faulty, replace the affected component and clear the code
  6. Verify repair by test-driving the vehicle and confirming the increase distance function works and the code does not return
  7. If the fault persists, diagnose the cruise control module or BCM according to the manufacturer's service information

Before you replace the clock spring

  • A common oversight is assuming the clock spring is bad when the real problem is a dirty or worn increase distance switch inside the steering wheel button pad.
  • Aftermarket steering wheel covers or phone mounts can pinch the switch wiring and cause intermittent P056A without any visible damage.
  • The code can set from a weak battery or low charging voltage that causes the cruise control module to misread the switch signal during engine start.
  • On some vehicles, the increase distance button shares a ground with the horn, so a bad horn ground can trigger this code even though the horn still works.
  • A scan tool that shows switch voltage in live data is far more reliable than a resistance check alone, because the fault may only appear when the button is pressed.

Can I keep driving with P056A?

The vehicle remains safe to drive because cruise control is a convenience feature and the fault does not affect braking, steering, or engine power. Avoid using cruise control until the repair is completed, and be aware that the system may disengage unexpectedly if the button is pressed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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