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P056C 2017 Chevrolet Silverado Code - Cruise Control Cancel Switch Circuit

Quick Answer

The P056C diagnostic trouble code (DTC) indicates an issue with the cruise control cancel switch circuit in a 2017 Chevrolet Silverado. Common causes include Faulty cruise control cancel switch, Damaged or frayed wiring in the cruise control circuit, Poor electrical connections or corrosion in the cruise control system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P056C 2017 Chevrolet Silverado indicates Cruise Control Cancel Switch Circuit.
Common causes
Common causes include Faulty cruise control cancel switch, Damaged or frayed wiring in the cruise control circuit, Poor electrical connections or corrosion in the cruise control system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Oct 17, 2024
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Code P056C 2017 Chevrolet Silverado Description

The P056C diagnostic trouble code (DTC) indicates an issue with the cruise control cancel switch circuit in a 2017 Chevrolet Silverado. This code is triggered when the Engine Control Module (ECM) detects an abnormal signal or malfunction in the cruise control cancel switch circuit. The cruise control system is designed to maintain a vehicle's speed without the driver needing to keep their foot on the accelerator pedal. The cancel switch is a critical component that allows the driver to deactivate cruise control when necessary, such as when applying the brakes or pressing the cancel button.

OBDII Code P056C 2017 Chevrolet Silverado - Cruise Control Cancel Switch Circuit
P056C 2017 Chevrolet Silverado Code - Cruise Control Cancel Switch Circuit

Common Causes of P056C 2017 Chevrolet Silverado

  1. Faulty cruise control cancel switch.
  2. Damaged or frayed wiring in the cruise control circuit.
  3. Poor electrical connections or corrosion in the cruise control system.
  4. Malfunctioning brake switch, which may not signal the ECM properly when brakes are applied.
  5. Issues with the ECM itself, such as software glitches or internal faults.

Symptoms of P056C 2017 Chevrolet Silverado

  1. Cruise control system is non-functional or intermittently works.
  2. Warning lights illuminated on the dashboard, such as the cruise control indicator.
  3. Difficulty in disengaging cruise control when applying brakes or pressing the cancel button.
  4. Unintended acceleration or erratic speed control when cruise control is engaged.
  5. Increased driver fatigue due to the inability to use cruise control on long trips.

How to Fix P056C 2017 Chevrolet Silverado

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the P056C code and check for any additional codes that may provide further insight into the issue.
  2. Inspect Wiring and Connectors: Visually inspect the wiring harness and connectors associated with the cruise control system for any signs of damage, corrosion, or loose connections.
  3. Test the Cancel Switch: Use a multimeter to test the functionality of the cruise control cancel switch. Replace the switch if it is found to be faulty.
  4. Check Brake Switch: Ensure that the brake switch is functioning correctly, as it plays a crucial role in the cruise control system. Replace if necessary.
  5. ECM Reprogramming or Replacement: If all other components are functioning correctly, consider reprogramming or replacing the ECM if it is determined to be the source of the problem.

Cost to Fix P056C 2017 Chevrolet Silverado

The typical cost to diagnose and repair the P056C code can vary significantly based on the specific issue and local labor rates. On average, repair costs may range from $150 to $600, including parts and labor. The cost of a new cruise control cancel switch can be around $50 to $150, while labor costs can vary from $80 to $150 per hour, depending on the shop's location and reputation. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to obtain quotes from local auto repair shops for a more precise estimate tailored to your vehicle's specific needs.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P056C 2017 Chevrolet Silverado Code

1. What does the OBDII code P056C mean on a 2017 Chevrolet Silverado?

P056C indicates a fault in the Cruise Control Cancel Switch Circuit, which is responsible for deactivating cruise control when the brake or clutch pedal is pressed.

2. What are the symptoms of code P056C in a 2017 Chevrolet Silverado?

Common symptoms include cruise control not functioning, the cruise control shutting off unexpectedly, or the check engine light illuminating.

3. What causes the P056C code to appear on a 2017 Chevrolet Silverado?

Possible causes include a faulty cruise control cancel switch, damaged wiring or connectors in the circuit, or issues with the brake pedal position sensor.

4. Can I still drive my 2017 Chevrolet Silverado with the P056C code?

Yes, the vehicle remains drivable, but cruise control functionality may be impaired, and the check engine light will stay on until the issue is resolved.

5. How do I diagnose the P056C code on a 2017 Chevrolet Silverado?

Diagnose the issue by using a scan tool to read live data, inspecting the cruise control cancel switch and related wiring for damage, and testing the brake pedal position sensor.

6. How can I fix the P056C code in my 2017 Chevrolet Silverado?

Repairs may include replacing the cruise control cancel switch, repairing or replacing damaged wiring or connectors, or recalibrating or replacing the brake pedal position sensor.

7. How much does it cost to repair the P056C code on a 2017 Chevrolet Silverado?

Repair costs vary, but replacing the cruise control cancel switch typically ranges from $100 to $300, including parts and labor.

8. Can a blown fuse cause the P056C code in a 2017 Chevrolet Silverado?

While unlikely, a blown fuse related to the cruise control system may contribute to this issue. It’s worth checking the fuses as part of the diagnostic process.

9. Will clearing the P056C code with a scanner fix the problem?

Clearing the code will turn off the check engine light temporarily, but the issue will reoccur unless the underlying problem is resolved.

10. Is the P056C code related to other systems in my 2017 Chevrolet Silverado?

Yes, it can be related to the brake or clutch pedal position sensors since these components interact with the cruise control system to cancel its operation.

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