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P155A Cadillac 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 Cadillac 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 1,629

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 Cadillac 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 Cadillac - Cruise Control Switch State Undetermined - AutoCodes.com — P155A Cadillac Code - Cruise Control Switch State Undetermined

What does this mean?

What are the Possible Causes of the DTC P155A Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What does the OBDII code P155A mean on a Cadillac?

P155A indicates that the vehicle's onboard diagnostic system has detected an issue with the cruise control switch, specifically that its state cannot be determined.

2. What are common symptoms of the P155A code in a Cadillac?

Common symptoms include the cruise control not engaging, the cruise control turning off unexpectedly, or a warning light appearing on the dashboard.

3. What causes the P155A code to appear in a Cadillac?

This code can be caused by a faulty cruise control switch, damaged wiring or connectors in the cruise control circuit, or a malfunctioning body control module (BCM).

4. Can I still drive my Cadillac with the P155A code active?

Yes, the vehicle is usually safe to drive, but the cruise control system may not function properly until the issue is resolved.

5. How do I diagnose the P155A code on my Cadillac?

Start by inspecting the cruise control switch and its wiring for damage or loose connections. Use a scan tool to monitor the switch's input to the BCM and ensure it functions correctly.

6. How do I fix the P155A code on my Cadillac?

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 repair the P155A code on a Cadillac?

Repair costs vary depending on the exact issue but typically range from $100 to $500, depending on whether the switch or BCM needs replacement.

8. Can a faulty brake pedal switch trigger the P155A code in a Cadillac?

Yes, since the brake pedal switch is linked to the cruise control system, a malfunctioning brake switch may contribute to the P155A code.

9. Will clearing the P155A code with a scan tool solve the issue?

Clearing the code may temporarily remove it, but the underlying problem must be fixed to prevent the code from returning.

10. Is the P155A code unique to Cadillacs?

While the P155A code is most commonly associated with Cadillac vehicles, similar codes may appear in other General Motors brands with comparable systems.