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Engine-Codes – GMC – P155A 2017 GMC Sierra

P155A 2017 GMC Sierra Code - Cruise Control Switch State Undetermined

Quick Answer

The diagnostic trouble code P155A for a 2017 GMC Sierra indicates an issue with the cruise control switch state being undetermined. Common causes include Faulty cruise control switch, Malfunctioning cruise control module, Wiring issues in the cruise control system. 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
P155A 2017 GMC Sierra indicates Cruise Control Switch State Undetermined.
Common causes
Common causes include Faulty cruise control switch, Malfunctioning cruise control module, Wiring issues in the cruise control system.
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 13, 2024
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Code P155A 2017 GMC Sierra Description

The diagnostic trouble code P155A for a 2017 GMC Sierra indicates an issue with the cruise control switch state being undetermined. The cruise control system in a vehicle allows the driver to set a desired speed that the vehicle will maintain automatically, without the need for constant throttle input. When the cruise control switch state is undetermined, it means that the vehicle's computer is unable to determine the status of the cruise control system, potentially leading to the cruise control not functioning properly.

OBDII Code P155A 2017 GMC Sierra - Cruise Control Switch State Undetermined
P155A 2017 GMC Sierra Code - Cruise Control Switch State Undetermined

Common Causes of P155A 2017 GMC Sierra

  1. Faulty cruise control switch
  2. Malfunctioning cruise control module
  3. Wiring issues in the cruise control system
  4. Problem with the vehicle speed sensor
  5. Issues with the engine control module

Symptoms of P155A 2017 GMC Sierra

  1. Inoperable cruise control system
  2. Cruise control light flashing or staying on
  3. Vehicle speed not maintaining steady when cruise control is engaged
  4. Check engine light illuminated

How to Fix P155A 2017 GMC Sierra

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code and determine the exact cause of the issue.
  2. Inspect the cruise control switch and module for any visible damage or signs of malfunction. Replace any components that are faulty.
  3. Check the wiring in the cruise control system for any breaks, shorts, or loose connections. Repair or replace any damaged wiring.
  4. Test the vehicle speed sensor to ensure it is functioning correctly. Replace the sensor if necessary.
  5. Clear the trouble code from the vehicle's computer using the diagnostic scanner and test the cruise control system to verify that the issue has been resolved.

Cost to Fix P155A 2017 GMC Sierra

The typical repair costs for addressing the P155A code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts for this repair may range from $50 to $200, while the labor costs can range from $100 to $300. It's important to note that the actual cost may be higher or lower based on the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic or repair shop for a more accurate estimate based on the specific circumstances.

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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 P155A 2017 GMC Sierra Code

1. What does OBDII code P155A mean for a 2017 GMC Sierra?

- OBDII code P155A on a 2017 GMC Sierra indicates a Cruise Control Switch State Undetermined error.

2. What are the common symptoms of OBDII code P155A in a 2017 GMC Sierra?

- Common symptoms of OBDII code P155A in a 2017 GMC Sierra may include inoperative cruise control or the cruise control system not functioning as expected.

3. What are the potential causes of OBDII code P155A in a 2017 GMC Sierra?

- The potential causes of OBDII code P155A in a 2017 GMC Sierra can include a faulty cruise control switch, wiring issues, or a malfunctioning cruise control module.

4. How do you diagnose OBDII code P155A in a 2017 GMC Sierra?

- Diagnosing OBDII code P155A in a 2017 GMC Sierra typically involves checking the cruise control switch, inspecting the wiring for any damage, and testing the cruise control module for proper functionality.

5. Can OBDII code P155A in a 2017 GMC Sierra be fixed at home?

- Depending on the underlying cause, fixing OBDII code P155A in a 2017 GMC Sierra may be possible at home if you have the necessary tools and expertise to diagnose and repair the issue.

6. Is it safe to continue driving with OBDII code P155A in a 2017 GMC Sierra?

- While OBDII code P155A may not directly affect the drivability of the vehicle, it is recommended to address the issue promptly to ensure the cruise control system functions correctly.

7. How much does it cost to repair OBDII code P155A in a 2017 GMC Sierra?

- The cost of repairing OBDII code P155A in a 2017 GMC Sierra can vary depending on the specific cause of the issue, parts needed for replacement, and labor charges at the repair shop.

8. Can resetting the OBDII system clear code P155A in a 2017 GMC Sierra?

- Resetting the OBDII system may temporarily clear code P155A in a 2017 GMC Sierra, but if the underlying issue is not fixed, the code is likely to reappear once the system detects the problem again.

9. Will OBDII code P155A cause my 2017 GMC Sierra to fail an emissions test?

- OBDII code P155A itself may not cause your 2017 GMC Sierra to fail an emissions test, but it is recommended to address any stored trouble codes before undergoing emissions testing to ensure proper functionality of all vehicle systems.

10. How long does it typically take to repair OBDII code P155A in a 2017 GMC Sierra?

- The time needed to repair OBDII code P155A in a 2017 GMC Sierra can vary depending on the complexity of the issue, availability of parts, and the skill of the technician performing the repair.

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