AutoCodes – Buick – P1B15 Buick

P1B15 Buick Code - Regenerative Braking Torque Request Signal Message Counter Incorrect

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module. Common causes include Reprogram Motor Generator Power Inverter Module, Faulty Motor Generator Power Inverter Module, Motor Generator Power Inverter Module harness is open or shorted. 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: P1B15 Buick indicates Regenerative Braking Torque Request Signal Message Counter Incorrect.
Common causes: Common causes include Reprogram Motor Generator Power Inverter Module, Faulty Motor Generator Power Inverter Module, Motor Generator Power Inverter Module harness is open or shorted.
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 834

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B15 Buick Description

This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module. The hybrid powertrain control module is internal to the power inverter module, often referred to as the drive motor generator power inverter module and is not serviced separately. The hybrid powertrain control module monitors its ability to read and write to the memory. The hybrid powertrain control module processor monitors the data to verify that the indicated brake torque request calculation is correct.

OBDII Code P1B15 Buick - Regenerative Braking Torque Request Signal Message Counter Incorrect - AutoCodes.com — P1B15 Buick Code - Regenerative Braking Torque Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1B15 Buick?

Reprogram Motor Generator Power Inverter Module
Faulty Motor Generator Power Inverter Module
Motor Generator Power Inverter Module harness is open or shorted
Motor Generator Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1B15 Buick?

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 P1B15 Buick 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 P1B15 Buick Code

1. What does the OBDII code P1B15 mean on a Buick?

The code P1B15 indicates an issue with the regenerative braking system, specifically that the torque request signal message counter is incorrect.

2. What are the common symptoms of code P1B15 in a Buick?

Symptoms may include reduced regenerative braking performance, warning lights on the dashboard, and potentially diminished fuel efficiency in hybrid or electric models.

3. What causes the P1B15 code to appear?

This code is typically triggered by a communication error between the brake control module and the drivetrain control module, often caused by software glitches, wiring issues, or a faulty module.

4. Can I continue driving with the P1B15 code active?

While the vehicle may still be drivable, ignoring the issue could result in reduced braking efficiency or further damage to the regenerative braking system.

5. How is the P1B15 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the communication network between relevant modules, and test the integrity of wiring and connectors.

6. Can the P1B15 code be fixed with a software update?

In some cases, a software update for the brake or drivetrain control module may resolve the issue if itâ€™s caused by a programming error.

7. What repairs might be needed to fix the P1B15 code?

Repairs can include replacing damaged wiring, repairing faulty connectors, or replacing a malfunctioning control module related to the regenerative braking system.

8. Does the P1B15 code affect conventional braking?

The conventional braking system should still function, but the vehicle may lose the efficiency benefits of regenerative braking.

9. How much does it cost to fix the P1B15 code on a Buick?

The cost varies depending on the root cause, but diagnostics can range from $100 to $200, with additional repair costs if parts or reprogramming are needed.

10. How can I prevent the P1B15 code from occurring again?

Regular maintenance, including checking wiring and keeping software up to date, can help prevent this code from reappearing.