AutoCodes – Chevrolet – P155A 2018 Chevrolet Silverado

P155A 2018 Chevrolet Silverado Code - Cruise Control Switch State Undetermined

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: P155A 2018 Chevrolet Silverado indicates Cruise Control Switch State Undetermined.
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 388

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P155A 2018 Chevrolet Silverado 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 Diagnostic Trouble Code (DTC) will be set when the ECM is unable to determine the state of the cruise control switch.

OBDII Code P155A 2018 Chevrolet Silverado - Cruise Control Switch State Undetermined - AutoCodes.com — P155A 2018 Chevrolet Silverado Code - Cruise Control Switch State Undetermined

What does this mean?

What are the Possible Causes of the DTC P155A 2018 Chevrolet Silverado?

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 P155A 2018 Chevrolet Silverado?

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 P155A 2018 Chevrolet Silverado 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 P155A 2018 Chevrolet Silverado code?

Need more information on how to fix the P155A 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 $100â€“$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, itâ€™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.