AutoCodes – Buick – P1A5F Buick

P1A5F Buick Code - Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage

Quick Answer

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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: P1A5F Buick indicates Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage.
Common causes: Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 970

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 Jan 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1A5F Buick Description

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the Transmission Control Module (TCM).

OBDII Code P1A5F Buick - Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage - AutoCodes.com — P1A5F Buick Code - Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A5F Buick?

Faulty Hybrid Powertrain Control Module 2
Hybrid Powertrain Control Module 2 harness is open or shorted
Hybrid Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC P1A5F 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 P1A5F 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.

Need more information about the P1A5F Buick code?

Need more information on how to fix the P1A5F Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A5F Buick code diagnosed by a professional: Find a repair shop in your area

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 P1A5F Buick Code

1. What does the OBDII code P1A5F mean on a Buick?

The code P1A5F indicates a problem with the Battery Energy Control Module's Ignition On/Start Switch Circuit, specifically a high voltage issue.

2. What are the common symptoms of a P1A5F code in a Buick?

Symptoms may include the check engine light turning on, issues with starting the vehicle, reduced hybrid or electric performance (if applicable), or limited drivability.

3. What causes the P1A5F code to appear in a Buick?

Common causes include a faulty Battery Energy Control Module, damaged wiring or connectors in the ignition or start switch circuit, or an issue with the ignition switch itself.

4. Can I drive my Buick with a P1A5F code?

While the car may still run, it's not advisable to drive with this code, as it could lead to further electrical issues or reduced performance, especially in hybrid or electric models.

5. How do you diagnose the P1A5F code in a Buick?

Diagnosis involves checking for loose or damaged wiring in the ignition/start switch circuit, testing the Battery Energy Control Module, and verifying the ignition switch operation using a scan tool.

6. How do you fix a P1A5F code in a Buick?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the ignition switch, or replacing the Battery Energy Control Module if necessary.

7. Can a low battery cause the P1A5F code in a Buick?

Yes, a weak or failing vehicle battery can sometimes cause electrical circuit issues, including triggering the P1A5F code.

8. Will clearing the P1A5F code solve the problem?

Clearing the code might temporarily turn off the check engine light, but the underlying issue must be fixed to prevent the code from returning.

9. How much does it cost to repair a P1A5F code in a Buick?

Repair costs vary based on the root cause, ranging from $100 for minor wiring repairs to over $1,000 if the Battery Energy Control Module needs replacement.

10. Can a DIYer fix the P1A5F code in a Buick?

If you're experienced with automotive electrical systems, you may be able to inspect and repair wiring issues. However, diagnosing and replacing the Battery Energy Control Module typically requires specialized tools and knowledge.