AutoCodes – GMC – P155B 2018 GMC Sierra

P155B 2018 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 2018 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 159

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 2018 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 2018 GMC Sierra - Cruise Control Set/Coast Switch 2 Circuit - AutoCodes.com — P155B 2018 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit

What does this mean?

What are the Possible Causes of the DTC P155B 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the P155B 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 2018 GMC Sierra Code

What does the OBDII code P155B mean on a 2018 GMC Sierra?

P155B indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which monitors signals related to cruise control operation.

What are the common symptoms of code P155B in a 2018 GMC Sierra?

Symptoms may include cruise control not engaging, intermittent functionality, or the cruise control system turning off unexpectedly.

What causes the P155B code to appear on a 2018 GMC Sierra?

Common causes include a faulty cruise control switch, damaged wiring or connectors in the circuit, or issues with the vehicle's body control module (BCM).

How can I diagnose the P155B code on a 2018 GMC Sierra?

Check the wiring and connectors for damage, test the cruise control switch for proper operation, and use a diagnostic scan tool to monitor circuit signals.

Can I still drive my 2018 GMC Sierra with the P155B code?

Yes, you can drive the vehicle, but the cruise control system may not function properly, which could reduce convenience on longer drives.

How do I fix the P155B code on a 2018 GMC Sierra?

Repairs may involve replacing the cruise control switch, repairing or replacing damaged wiring, or reprogramming the BCM if necessary.

How much does it cost to repair the P155B code in a 2018 GMC Sierra?

Repair costs can vary, but replacing a cruise control switch typically costs $100-$300, while wiring repairs may range from $50-$150. BCM reprogramming can cost $150-$300.

Is the P155B code a common issue for the 2018 GMC Sierra?

This code is not very common but may occur in vehicles with frequently used or worn cruise control systems.

Can a faulty cruise control switch cause the P155B code?

Yes, a malfunctioning cruise control switch is a primary cause of code P155B and should be tested during diagnosis.

Do I need professional help to fix the P155B code in my 2018 GMC Sierra?

If you're comfortable with electrical diagnostics and repairs, you can attempt to fix it yourself; otherwise, seek assistance from a qualified mechanic.