AutoCodes – Generic – P155A

P155A 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 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 11,100

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

What does this mean?

What are the Possible Causes of the DTC P155A?

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?

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 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 code?

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Need Help with the Code?

Get the P155A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P155A Bmw — Cruise Control Signal Interface Fault
P155A Buick — Cruise Control Switch State Undetermined
P155A Cadillac — Cruise Control Switch State Undetermined
P155A Chevrolet — Cruise Control Switch State Undetermined
P155A GMC — Cruise Control Switch State Undetermined
P155A MINI — Cruise Control Signal Interface Fault

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 Code

1. What are the common symptoms of OBDII code P155A - Cruise Control Switch State Undetermined?

- Common symptoms include the cruise control not engaging or maintaining speed, the cruise control light flashing, and an illuminated check engine light.

2. What are the possible causes of OBDII code P155A?

- The code P155A can be caused by a faulty cruise control switch, wiring issues, a malfunctioning cruise control module, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P155A?

- Diagnosis typically involves checking the cruise control switch for proper operation, inspecting the wiring for any breaks or shorts, and using a scan tool to retrieve additional fault codes for further troubleshooting.

4. Can I still drive my vehicle with OBDII code P155A present?

- It is generally safe to drive the vehicle with code P155A present, but it is recommended to address the issue promptly to avoid potential issues with the cruise control system.

5. Can I repair OBDII code P155A myself?

- Depending on your level of automotive expertise, you may be able to repair code P155A yourself by replacing the faulty cruise control switch, repairing any wiring issues, or addressing other potential causes of the code.

6. Will resetting the check engine light resolve OBDII code P155A?

- Simply resetting the check engine light will not resolve the underlying issue causing code P155A. It is important to diagnose and repair the root cause of the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code P155A?

- The cost of repairing code P155A can vary depending on the cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic.

8. Is OBDII code P155A a common issue in certain vehicle makes and models?

- Code P155A related to Cruise Control Switch State Undetermined can be more common in vehicles equipped with cruise control systems, especially in models prone to electrical or sensor issues.

9. Can OBDII code P155A cause any long-term damage to my vehicle?

- While code P155A itself may not cause immediate damage, ignoring the underlying issue with the cruise control system can lead to potential safety concerns or further damage if left unresolved.

10. How quickly should I address OBDII code P155A to prevent any further issues?

- It is recommended to address code P155A as soon as possible to ensure the proper functioning of the cruise control system and to prevent any potential safety hazards while driving.