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Engine-Codes – Generic – P15A3

P15A3 Code - Stop/Start Select Switch Circuit Signal Message Counter Incorrect

Quick Answer

The P15A3 diagnostic trouble code (DTC) indicates that there is an issue with the Stop/Start select switch circuit signal message counter being incorrect. Common causes include Faulty Stop/Start select switch, Wiring issues or loose connections in the switch circuit, Malfunctioning communication between the switch and the vehicle's computer. 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
P15A3 indicates Stop/Start Select Switch Circuit Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Stop/Start select switch, Wiring issues or loose connections in the switch circuit, Malfunctioning communication between the switch and the vehicle's computer.
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 Aug 19, 2024
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Code P15A3 Description

The P15A3 diagnostic trouble code (DTC) indicates that there is an issue with the Stop/Start select switch circuit signal message counter being incorrect. This code is typically found in vehicles equipped with a Stop/Start system, which automatically shuts off the engine when the vehicle comes to a stop and restarts it when the driver releases the brake pedal. The switch circuit signal message counter is responsible for monitoring the communication between the switch and the vehicle's computer system.

OBDII Code P15A3 - Stop/Start Select Switch Circuit Signal Message Counter Incorrect
P15A3 Code - Stop/Start Select Switch Circuit Signal Message Counter Incorrect

Common Causes of P15A3

  1. Faulty Stop/Start select switch
  2. Wiring issues or loose connections in the switch circuit
  3. Malfunctioning communication between the switch and the vehicle's computer
  4. Software glitch in the vehicle's computer system
  5. Electrical issues in the system

Symptoms of P15A3

  1. Engine stalling or not starting properly
  2. Inability to engage or disengage the Stop/Start system
  3. Warning light illuminated on the dashboard
  4. Reduced fuel efficiency
  5. Erratic behavior of the Stop/Start system

How to Fix P15A3

  1. Begin by conducting a thorough visual inspection of the Stop/Start select switch and its wiring for any visible damage or loose connections.
  2. Use a multimeter to test the continuity of the switch circuit to identify any open circuits or shorts.
  3. Check for any software updates available for the vehicle's computer system and perform the necessary reprogramming.
  4. Replace the Stop/Start select switch if it is found to be faulty.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P15A3

The cost to repair a P15A3 code can vary depending on the specific cause of the issue. Typically, the cost of replacing a faulty Stop/Start select switch can range from $100 to $300, including parts and labor. Additional costs may apply if there are wiring or software issues that need to be addressed. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops can vary, so it's advisable to inquire about specific rates in your area.

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Code P15A3 Information for Specific Makes

  • P15A3 BMW — Engine Oil Pressure Too High
  • P15A3 Buick — Stop/Start Select Switch Circuit Signal Message Counter Incorrect
  • P15A3 Cadillac — Stop/Start Select Switch Circuit Signal Message Counter Incorrect
  • P15A3 Chevrolet — Stop/Start Select Switch Circuit Signal Message Counter Incorrect
  • P15A3 GMC — Stop/Start Select Switch Circuit Signal Message Counter Incorrect
  • P15A3 Honda — Motor Driver Module Voltage Signal Circuit High Input
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.

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