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P155B Chevrolet Code - Cruise Control Set/Coast Switch 2 Circuit

Quick Answer

The P155B diagnostic trouble code for Chevrolet vehicles specifically relates to an issue with the Cruise Control Set/Coast Switch 2 Circuit. Common causes include Faulty Cruise Control Set/Coast Switch 2 Circuit, Damaged wiring or connectors in the cruise control system, Corrosion or oxidation in the electrical connections. 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 Chevrolet indicates Cruise Control Set/Coast Switch 2 Circuit.
Common causes
Common causes include Faulty Cruise Control Set/Coast Switch 2 Circuit, Damaged wiring or connectors in the cruise control system, Corrosion or oxidation in the electrical connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P155B Chevrolet Description

The P155B diagnostic trouble code for Chevrolet vehicles specifically relates to an issue with the Cruise Control Set/Coast Switch 2 Circuit. Cruise control is a system in vehicles that allows the driver to set a constant speed without having to manually control the throttle. The Cruise Control Set/Coast Switch 2 Circuit plays a crucial role in this system by sending signals to the vehicle's engine control module to adjust the speed as needed.

OBDII Code P155B Chevrolet - Cruise Control Set/Coast Switch 2 Circuit
P155B Chevrolet Code - Cruise Control Set/Coast Switch 2 Circuit

Common Causes of P155B Chevrolet

  1. Faulty Cruise Control Set/Coast Switch 2 Circuit.
  2. Damaged wiring or connectors in the cruise control system.
  3. Corrosion or oxidation in the electrical connections.
  4. Issues with the engine control module (ECM) communication.

Symptoms of P155B Chevrolet

  1. Inability to set a constant speed using the cruise control system.
  2. Cruise control system engaging or disengaging unexpectedly.
  3. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
  4. Decreased fuel efficiency due to inconsistent speed control.

How to Fix P155B Chevrolet

  1. Begin by diagnosing the specific cause of the P155B code using a diagnostic scan tool.
  2. Inspect the wiring, connectors, and components associated with the Cruise Control Set/Coast Switch 2 Circuit for any visible damage or corrosion.
  3. Test the functionality of the cruise control system to identify the exact point of failure.
  4. Replace any faulty components, such as switches or sensors, and repair any damaged wiring or connectors.
  5. Clear the trouble code from the vehicle's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P155B Chevrolet

The typical repair costs for addressing the P155B code related to the Cruise Control Set/Coast Switch 2 Circuit can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair for this issue could range from $100 to $300, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle model.

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Information for Specific Chevrolet Models

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 Chevrolet Code

1. What does the OBDII code P155B mean on a Chevrolet?

P155B indicates an issue with the Cruise Control Set/Coast Switch 2 Circuit, which may involve a malfunction in the wiring, switch, or related components.

2. What are common symptoms of the P155B code on a Chevrolet?

Symptoms include the cruise control not engaging, disengaging unexpectedly, or the cruise control indicator light not functioning properly.

3. What causes the P155B code to appear?

Common causes include a faulty cruise control switch, damaged wiring or connectors, or a malfunction in the vehicle's control module.

4. Can I drive my Chevrolet with the P155B code active?

Yes, the vehicle is typically safe to drive, but cruise control functionality may be impaired or unavailable.

5. How can I diagnose the P155B code on my Chevrolet?

Diagnose by inspecting the cruise control switch for damage, checking the wiring and connectors for continuity, and using a scan tool to monitor switch input signals.

6. What are the most common fixes for the P155B code?

Repairs often involve replacing the cruise control switch, repairing damaged wiring, or, in rare cases, reprogramming or replacing the control module.

7. Is the P155B code specific to Chevrolet vehicles?

While it is common on Chevrolet models, other manufacturers may have similar codes for cruise control circuit issues, but the numbering and specifics may differ.

8. How much does it typically cost to fix the P155B code on a Chevrolet?

Repair costs can range from $100 to $300 depending on whether the issue is with the switch, wiring, or other components.

9. Can a bad brake light switch cause the P155B code on a Chevrolet?

It’s unlikely, but a malfunctioning brake light switch can interfere with cruise control operation and should be checked if other components seem fine.

10. Do I need to reset the code after fixing the P155B issue?

Yes, after completing repairs, clear the code with an OBDII scanner and test drive to ensure the issue is resolved.

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