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Engine-Codes – GMC – P155C GMC

P155C GMC Code - Cruise Control Resume/Acceleration Switch 2 Circuit

Quick Answer

The P155C diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the Cruise Control Resume/Acceleration Switch 2 Circuit. Common causes include Malfunctioning cruise control switch, Damaged wiring or connectors in the Cruise Control Resume/Acceleration Switch 2 Circuit, Faulty cruise control module. 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
P155C GMC indicates Cruise Control Resume/Acceleration Switch 2 Circuit.
Common causes
Common causes include Malfunctioning cruise control switch, Damaged wiring or connectors in the Cruise Control Resume/Acceleration Switch 2 Circuit, Faulty cruise control module.
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 P155C GMC Description

The P155C diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the Cruise Control Resume/Acceleration Switch 2 Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the cruise control system's resume and acceleration functions. The cruise control system allows the driver to set a desired speed that the vehicle will maintain automatically, providing convenience and reducing driver fatigue on long trips.

OBDII Code P155C GMC - Cruise Control Resume/Acceleration Switch 2 Circuit
P155C GMC Code - Cruise Control Resume/Acceleration Switch 2 Circuit

Common Causes of P155C GMC

  1. Malfunctioning cruise control switch.
  2. Damaged wiring or connectors in the Cruise Control Resume/Acceleration Switch 2 Circuit.
  3. Faulty cruise control module.
  4. Corrosion or contamination affecting the circuit connections.
  5. Electrical issues such as short circuits or open circuits in the system.

Symptoms of P155C GMC

  1. Inability to set or maintain a constant speed using the cruise control system.
  2. Cruise control system not responding to acceleration or resume commands.
  3. Illumination of the cruise control warning light on the dashboard.
  4. Erratic behavior of the cruise control system, such as sudden acceleration or deceleration.
  5. Engine entering limp mode or reduced power mode to prevent further damage.

How to Fix P155C GMC

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific trouble code and pinpoint the exact cause of the problem.
  2. Inspect the Cruise Control Resume/Acceleration Switch 2 Circuit for any visible damage, corrosion, or loose connections.
  3. Test the cruise control switch for proper functionality and replace if necessary.
  4. Check the wiring harness for any breaks or damage, repairing or replacing any faulty sections.
  5. Reset the onboard computer and clear the DTC to see if the issue has been resolved, then test the cruise control system to ensure proper operation.

Cost to Fix P155C GMC

The cost of repairing the Cruise Control Resume/Acceleration Switch 2 Circuit issue can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the parts required for this repair may range from $50 to $200, while labor costs can add an additional $100 to $300 to the total bill. Therefore, the total repair cost for addressing this code could be between $150 and $500, excluding any diagnostic fees that may apply. It's important to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the vehicle's make and model, as well as the local labor rates in your area.

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Information for Specific GMC 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 P155C GMC Code

1. What are the common symptoms of OBDII code P155C GMC?

The common symptoms of code P155C GMC include inoperative cruise control, inability to resume speed while driving, and issues with accelerating using the cruise control system.

2. What does the OBDII code P155C GMC indicate?

OBDII code P155C GMC indicates a fault in the Cruise Control Resume/Acceleration Switch 2 Circuit.

3. What are the possible causes of OBDII code P155C GMC?

Possible causes of code P155C GMC include a faulty cruise control resume/acceleration switch, damaged wiring or connectors in the circuit, or a malfunctioning cruise control module.

4. How can I diagnose the cause of OBDII code P155C GMC?

Diagnosing code P155C GMC involves inspecting the cruise control resume/acceleration switch, checking the wiring and connectors for any damage, and testing the cruise control module for proper functionality.

5. Can I still drive my vehicle with OBDII code P155C GMC?

While it may be safe to drive your vehicle with code P155C GMC, it is recommended to address the issue promptly to avoid any potential safety hazards or further damage to the cruise control system.

6. How can I repair OBDII code P155C GMC?

To repair code P155C GMC, you may need to replace the faulty cruise control resume/acceleration switch, repair any damaged wiring or connectors, or recalibrate the cruise control module as needed.

7. Is it possible to reset OBDII code P155C GMC without repairs?

While resetting the code may temporarily clear the error, it is not recommended to do so without addressing the underlying issue, as the problem may persist and affect the functionality of the cruise control system.

8. Can a DIY enthusiast fix OBDII code P155C GMC?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P155C GMC by following the manufacturer's service manual or seeking guidance from automotive resources.

9. How much does it cost to fix OBDII code P155C GMC at a repair shop?

The cost of fixing code P155C GMC at a repair shop can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of any parts that need to be replaced. It is advisable to get a few quotes from different shops.

10. Will fixing OBDII code P155C GMC require a trip to the dealership?

While some complex repairs may require specialized tools or expertise available at a dealership, many independent repair shops should be able to diagnose and repair code P155C GMC effectively.

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