AutoCodes – Generic – P15FF

P15FF Code - Battery Monitor Sensor Signal Message Counter Incorrect

Quick Answer

The Battery Monitor Module performs internal diagnostics. Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery Monitor Module 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: P15FF indicates Battery Monitor Sensor Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery Monitor Module 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 62

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 Oct 03, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P15FF Description

The Battery Monitor Module performs internal diagnostics. The Battery Monitor Module communicates to the Body Control Module (BCM) Via LIN. The Body Control Module communicates the Battery Monitor module data to the Engine Control Module Via Serial Data. The Diagnostic Trouble Code (DTC) will be set when the Battery Monitor Module detects an internal fault, or an error in communication of the alive rolling count is detected for greater than 10 counts.

OBDII Code P15FF - Battery Monitor Sensor Signal Message Counter Incorrect - AutoCodes.com — P15FF Code - Battery Monitor Sensor Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P15FF?

Faulty Battery Monitor Module
Battery Monitor Module harness is open or shorted
Battery Monitor Module circuit poor electrical connection

How to Fix the DTC P15FF?

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 P15FF 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 P15FF code?

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Information for Specific Makes

P15FF Buick — Battery Monitor Sensor Signal Message Counter Incorrect
P15FF Cadillac — Battery Monitor Sensor Signal Message Counter Incorrect
P15FF Chevrolet — Battery Monitor Sensor Signal Message Counter Incorrect
P15FF GMC — Battery Monitor Sensor Signal Message Counter Incorrect

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.