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P155A 2018 Chevrolet Silverado Code - Cruise Control Switch State Undetermined

Quick Answer

The P155A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the cruise control switch state being undetermined. Common causes include Faulty cruise control switch, Damaged wiring or connectors in the cruise control circuit, Malfunctioning 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
P155A 2018 Chevrolet Silverado indicates Cruise Control Switch State Undetermined.
Common causes
Common causes include Faulty cruise control switch, Damaged wiring or connectors in the cruise control circuit, Malfunctioning 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 P155A 2018 Chevrolet Silverado Description

The P155A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the cruise control switch state being undetermined. The cruise control system in a vehicle is responsible for maintaining a constant speed set by the driver without needing to constantly press the accelerator. When this code appears, it means that the control module is unable to determine the status of the cruise control switch, which can lead to the system not functioning properly.

OBDII Code P155A 2018 Chevrolet Silverado - Cruise Control Switch State Undetermined
P155A 2018 Chevrolet Silverado Code - Cruise Control Switch State Undetermined

Common Causes of P155A 2018 Chevrolet Silverado

  1. Faulty cruise control switch.
  2. Damaged wiring or connectors in the cruise control circuit.
  3. Malfunctioning cruise control module.
  4. Corrosion in the cruise control system components.
  5. Electrical issues in the cruise control system.

Symptoms of P155A 2018 Chevrolet Silverado

  1. Inability to engage cruise control.
  2. Cruise control disengages unexpectedly.
  3. Erratic behavior of the cruise control system.
  4. Cruise control light on the dashboard may illuminate.

How to Fix P155A 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the cruise control switch, wiring, and connectors to identify any visible damage or issues.
  2. Test the cruise control switch using a multimeter to determine if it is functioning properly.
  3. Check the cruise control module for any signs of malfunction and test its operation.
  4. Repair or replace any faulty components identified during the inspection and testing process.
  5. Clear the DTC using an OBD-II scanner and test the cruise control system to ensure proper functionality.

Cost to Fix P155A 2018 Chevrolet Silverado

The typical repair costs for addressing the P155A code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of parts such as a cruise control switch or module can range from $50 to $200, while labor costs at an auto repair shop may add an additional $100 to $300. The total cost of repairs could amount to anywhere from $150 to $500. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.

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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 2018 Chevrolet Silverado Code

1. What does the OBDII code P155A mean on a 2018 Chevrolet Silverado?

P155A indicates an issue where the Cruise Control Switch State is undetermined, meaning the vehicle's system cannot properly interpret the cruise control switch's position or status.

2. What are the common symptoms of code P155A in a 2018 Chevrolet Silverado?

Symptoms include the cruise control not functioning, an illuminated check engine light, or intermittent functionality of the cruise control system.

3. What causes the P155A code to appear on a 2018 Chevrolet Silverado?

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

4. Can I still drive my 2018 Chevrolet Silverado with the P155A code active?

Yes, the vehicle is still drivable, but the cruise control feature may not work. However, it is recommended to address the issue to ensure proper functionality.

5. How can I diagnose the P155A code on my Silverado?

Start by visually inspecting the cruise control switch and related wiring for damage. Use a scan tool to check for live data from the cruise control system and test the switch's functionality.

6. How do I fix the P155A code on a 2018 Chevrolet Silverado?

Repairs may include replacing the cruise control switch, repairing damaged wiring or connectors, or reprogramming or replacing the body control module if necessary.

7. How much does it cost to fix the P155A code on a 2018 Silverado?

The cost varies depending on the issue. Replacing a cruise control switch could cost $100–$300, while BCM repairs or replacements may cost more.

8. Can a blown fuse cause the P155A code on a 2018 Chevrolet Silverado?

While a blown fuse is not a common cause for this code, it’s worth checking the cruise control circuit fuses as part of the diagnostic process.

9. Does the P155A code require a software update to fix?

In some cases, reprogramming the body control module (BCM) with updated software may resolve the issue. Consult a dealership or qualified technician for guidance.

10. How do I prevent the P155A code from recurring on my Silverado?

Regularly inspect the cruise control switch and its wiring for wear or damage, and address any electrical issues promptly to prevent future occurrences.

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