AutoCodes – Generic – P056C

P056C Code - Cruise Control Cancel Switch Circuit

Quick Answer

The Cruise Control Switch is an input to the Body Control Module (BCM). Common causes include Faulty Cruise Control Switch, Cruise Control Switch harness is open or shorted, Cruise Control Switch circuit poor electrical connection. 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 indicates Cruise Control Cancel Switch Circuit.
Common causes: Common causes include Faulty Cruise Control Switch, Cruise Control Switch harness is open or shorted, Cruise Control Switch circuit poor electrical connection.
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.

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Code Popularity 3,107

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P056C Description

The Cruise Control Switch is an input to the Body Control Module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The Engine Control Module (ECM) receives the requested cruise control switch function from the BCM via a serial data message. The BCM monitors the cruise control switch. The BCM sets the OBDII code when the cruise control switch is not to factory specifications. The BCM detects an invalid voltage signal on the cruise control switch signal circuit for greater than 2 seconds and sends a serial data message to the ECM. The ECM sets the Diagnostic Trouble Code (DTC) when the message is received.

OBDII Code P056C - Cruise Control Cancel Switch Circuit - AutoCodes.com — P056C Code - Cruise Control Cancel Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P056C?

Faulty Cruise Control Switch
Cruise Control Switch harness is open or shorted
Cruise Control Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC P056C?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P056C code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P056C code?

Need more information on how to fix the P056C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P056C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P056C Buick — Cruise Control Cancel Switch Circuit
P056C Cadillac — Cruise Control Cancel Switch Circuit
P056C Chevrolet — Cruise Control Cancel Switch Circuit
P056C GMC — Cruise Control Cancel Switch Circuit

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 Code

1. What are the common symptoms of OBDII code P056C (Cruise Control Cancel Switch Circuit)?

- The common symptoms include the cruise control system not working, the cruise control light staying illuminated, and the inability to set or maintain a set speed while driving.

2. What are the possible causes of OBDII code P056C (Cruise Control Cancel Switch Circuit)?

- The code can be triggered by a faulty cruise control cancel switch, damaged wiring or connectors in the cruise control system, or a defective cruise control module.

3. How can I diagnose OBDII code P056C (Cruise Control Cancel Switch Circuit) at home?

- You can use a diagnostic scanner to retrieve the trouble code and then visually inspect the cruise control cancel switch and its wiring for any visible damage or corrosion.

4. What are the repair options for OBDII code P056C (Cruise Control Cancel Switch Circuit)?

- Repair options include replacing the faulty cruise control cancel switch, repairing or replacing damaged wiring or connectors, and reprogramming the cruise control module if necessary.

5. Can I still drive my vehicle with OBDII code P056C (Cruise Control Cancel Switch Circuit) present?

- While it is generally safe to drive with this code, it is recommended to get the issue diagnosed and repaired as soon as possible to restore full functionality to the cruise control system.

6. Is OBDII code P056C (Cruise Control Cancel Switch Circuit) a serious problem?

- The code itself does not pose a serious threat to the vehicle's drivability or safety, but it can affect the convenience and functionality of the cruise control system.

7. Can a DIY enthusiast fix OBDII code P056C (Cruise Control Cancel Switch Circuit) on their own?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this code by following the appropriate repair procedures outlined in the vehicle's service manual.

8. Are there any preventive maintenance tips to avoid OBDII code P056C (Cruise Control Cancel Switch Circuit)?

- Regularly checking and maintaining the cruise control system components, such as the cancel switch and wiring, can help prevent issues that may trigger this code.

9. How long does it typically take to repair OBDII code P056C (Cruise Control Cancel Switch Circuit)?

- The repair time can vary based on the exact cause of the issue and the availability of parts, but in many cases, it can be resolved within a few hours to a day.

10. Should I reset the OBDII code P056C (Cruise Control Cancel Switch Circuit) after repairing the issue?

- Yes, it is recommended to reset the code using a diagnostic scanner after completing the repair to clear the error code and ensure proper functioning of the cruise control system.