AutoCodes – GMC – P155B 2017 GMC Sierra

P155B 2017 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 2017 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 175

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 2017 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 2017 GMC Sierra - Cruise Control Set/Coast Switch 2 Circuit - AutoCodes.com — P155B 2017 GMC Sierra Code - Cruise Control Set/Coast Switch 2 Circuit

What does this mean?

What are the Possible Causes of the DTC P155B 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What does the OBDII code P155B mean on a 2017 GMC Sierra?

The P155B code indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which is part of the cruise control system.

2. What are the symptoms of the P155B code on a 2017 GMC Sierra?

Common symptoms include the cruise control not functioning, the cruise control light not illuminating, or intermittent cruise control operation.

3. What causes the P155B code to appear?

Possible causes include a faulty cruise control switch, damaged wiring or connectors in the circuit, or a problem with the ECM (engine control module).

4. How can I fix the P155B code on my GMC Sierra?

Start by inspecting the cruise control switch and its wiring for damage or loose connections. If no issues are found, the switch itself may need to be replaced or the ECM may require reprogramming.

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

Yes, you can drive the vehicle, but the cruise control system may not function properly until the issue is repaired.

6. How do I diagnose the P155B code on a 2017 GMC Sierra?

Use an OBDII scanner to confirm the code, then perform a visual inspection of the cruise control switch, wiring, and connectors. Test the switch with a multimeter and check for continuity in the circuit.

7. Is the P155B code related to other systems in the vehicle?

The P155B code specifically pertains to the cruise control system and does not directly affect other systems, though it shares wiring with other components that could also be impacted.

8. How much does it cost to repair the P155B code?

Repair costs can vary but typically range from $100 to $300, depending on whether the issue lies with the switch, wiring, or ECM.

9. Can a faulty brake switch cause the P155B code?

While uncommon, a faulty brake switch could interfere with cruise control operation and should be checked if no issues are found with the set/coast switch or wiring.

10. Will clearing the P155B code with a scanner fix the issue?

Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.