AutoCodes – GMC – P056C GMC

P056C GMC 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 GMC 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 826

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

What does this mean?

What are the Possible Causes of the DTC P056C GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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Information for Specific GMC Models

P056C 2014 GMC Sierra — Cruise Control Cancel Switch Circuit
P056C 2015 GMC Sierra — Cruise Control Cancel Switch Circuit
P056C 2016 GMC Sierra — Cruise Control Cancel Switch Circuit
P056C 2017 GMC Sierra — Cruise Control Cancel Switch Circuit
P056C 2018 GMC Sierra — 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 GMC Code

1. What are the common symptoms of OBDII code P056C GMC?

The common symptoms of code P056C GMC include inoperative cruise control, illuminated cruise control warning light on the dashboard, and possible issues with the cancel switch functionality.

2. What does the Cruise Control Cancel Switch Circuit refer to in relation to code P056C GMC?

The Cruise Control Cancel Switch Circuit is a system that includes the cruise control cancel switch and related wiring, responsible for activating and deactivating the cruise control system in the vehicle.

3. What are the possible causes of OBDII code P056C GMC?

Possible causes of code P056C GMC include a faulty cruise control cancel switch, damaged wiring or connectors in the circuit, a malfunctioning cruise control module, or issues with the vehicle's ECM (Engine Control Module).

4. How can I diagnose the Cruise Control Cancel Switch Circuit issue related to code P056C GMC?

Diagnosis of the Cruise Control Cancel Switch Circuit involves inspecting the cancel switch for proper functionality, checking the wiring and connectors for any damage, and testing the cruise control module and ECM for faults using a diagnostic scanner.

5. Can I still drive my vehicle with OBDII code P056C GMC?

While it may be safe to drive your vehicle with code P056C GMC, it is recommended to address the issue promptly to ensure the proper functioning of the cruise control system and to prevent any potential safety hazards on the road.

6. How can I repair OBDII code P056C GMC?

Repairing code P056C GMC typically involves replacing the faulty cruise control cancel switch, repairing any damaged wiring or connectors in the circuit, or addressing any underlying issues with the cruise control module or ECM as needed.

7. Is it possible to reset OBDII code P056C GMC without repairs?

While clearing the trouble code using a diagnostic scanner may temporarily reset the MIL (Malfunction Indicator Lamp), the underlying issue causing code P056C GMC will persist until properly diagnosed and repaired.

8. Can a DIY enthusiast fix OBDII code P056C GMC at home?

Depending on the individual's automotive repair skills and access to tools, a DIY enthusiast may be able to diagnose and repair code P056C GMC at home by following the vehicle's service manual or seeking guidance from online resources.

9. Are there any safety concerns associated with OBDII code P056C GMC?

Since code P056C GMC affects the cruise control system, there may be safety concerns related to the inoperative cruise control functionality, especially during long highway drives where cruise control is commonly used.

10. How long does it typically take to repair OBDII code P056C GMC?

The repair time for code P056C GMC can vary depending on the exact cause of the issue, the availability of replacement parts, and the individual's level of experience with automotive repairs. It is advisable to allocate sufficient time for diagnosis and repair to ensure a proper fix.