AutoCodes – Buick – P056C Buick

P056C Buick 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 Buick 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 902

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

What does this mean?

What are the Possible Causes of the DTC P056C Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What does the OBDII code P056C mean on a Buick?

P056C indicates an issue with the Cruise Control Cancel Switch Circuit, which is responsible for disabling the cruise control system when certain inputs are detected, such as pressing the brake or clutch.

2. What are the common symptoms of code P056C in a Buick?

Symptoms may include the cruise control system not engaging or disengaging properly, a check engine light, or a malfunction indicator for the cruise control system.

3. What causes the P056C code to appear on a Buick?

Common causes include a faulty cruise control cancel switch, damaged wiring or connectors in the circuit, or an issue with the vehicle's PCM (powertrain control module).

4. Can I drive my Buick with the P056C code?

Yes, you can drive the vehicle, but the cruise control system may not function properly, which could be inconvenient or unsafe during long trips.

5. How do I diagnose the P056C code in a Buick?

Diagnosis involves using a scan tool to confirm the code, inspecting the cruise control cancel switch and its wiring for damage, and testing the switch for proper operation.

6. How do I fix the P056C code on a Buick?

Repairs may include replacing a faulty cruise control cancel switch, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. Is a P056C code specific to Buicks?

No, the code can appear on other vehicles as well, but the exact diagnosis and repair steps may vary depending on the make and model.

8. What tools are needed to repair the P056C code?

You may need a multimeter to test the circuit, a scan tool to read and clear codes, and basic hand tools for removing and replacing the switch or wiring.

9. How much does it cost to fix a P056C code on a Buick?

Repair costs depend on the exact cause but typically range from $100 to $300, including parts and labor, with higher costs possible if PCM replacement is required.

10. Can a P056C code be caused by a blown fuse?

While not common, a blown fuse associated with the cruise control system could potentially cause this code. Checking all related fuses is a good step in the diagnostic process.