AutoCodes – GMC – P155B 2015 GMC Sierra

P155B 2015 GMC Sierra Code - Cruise Control Set/Coast Switch 2 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: P155B 2015 GMC Sierra indicates Cruise Control Set/Coast Switch 2 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 152

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 P155B 2015 GMC Sierra 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.

OBDII Code P155B 2015 GMC Sierra - Cruise Control Set/Coast Switch 2 Circuit - AutoCodes.com — P155B 2015 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit

What does this mean?

What are the Possible Causes of the DTC P155B 2015 GMC Sierra?

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 P155B 2015 GMC Sierra?

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 P155B 2015 GMC Sierra 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 P155B 2015 GMC Sierra code?

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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 P155B 2015 GMC Sierra Code

What does the OBDII code P155B mean on a 2015 GMC Sierra?

The P155B code indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, often related to an electrical fault or malfunction in the cruise control system.

What are the common symptoms of a P155B code?

Symptoms may include the cruise control system not engaging, failing to maintain speed, or the cruise control light not functioning properly.

What causes the P155B code to appear?

Common causes include a faulty Set/Coast switch, damaged wiring, poor electrical connections, or a malfunctioning cruise control module.

Can a P155B code affect driving performance?

The code primarily impacts the cruise control system and usually does not affect overall driving performance, though it can be an inconvenience.

How can I diagnose the P155B code?

Start by inspecting the cruise control Set/Coast switch, checking the wiring and connectors for damage or corrosion, and using a multimeter to test the circuit's continuity.

Is it safe to drive with the P155B code?

Yes, it's generally safe to drive, but the cruise control functionality will be compromised until the issue is resolved.

How do I fix a P155B code on a 2015 GMC Sierra?

Repairs may involve replacing the Set/Coast switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the cruise control module if necessary.

Can a blown fuse cause the P155B code?

While rare, a blown fuse related to the cruise control system could contribute to the P155B code and should be checked during troubleshooting.

Does clearing the code fix the P155B issue?

Clearing the code may temporarily reset the system, but the underlying issue must be addressed to prevent the code from returning.

Do I need specialized tools to fix the P155B code?

Basic tools like a multimeter, a diagnostic scanner, and wiring repair tools may be needed for testing and repairs. Advanced tools may be required for module reprogramming if necessary.