AutoCodes – Buick – P1A58 Buick

P1A58 Buick Code - Hybrid Battery Pack Relay Open

Quick Answer

The Energy Storage Control Module (ESCM) will monitor the battery cut off switch for overvoltage or an open. Common causes include Faulty Hybrid Battery Cut Off Switch, Hybrid Battery Cut Off Switch harness is open or shorted, Hybrid Battery Cut Off 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: P1A58 Buick indicates Hybrid Battery Pack Relay Open.
Common causes: Common causes include Faulty Hybrid Battery Cut Off Switch, Hybrid Battery Cut Off Switch harness is open or shorted, Hybrid Battery Cut Off 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 1,130

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 Feb 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A58 Buick Description

The Energy Storage Control Module (ESCM) will monitor the battery cut off switch for overvoltage or an open. The ESCM sets the OBDII code when the Hybrid Battery Cut Off Switch is not to factory specifications.

OBDII Code P1A58 Buick - Hybrid Battery Pack Relay Open - AutoCodes.com — P1A58 Buick Code - Hybrid Battery Pack Relay Open

What does this mean?

What are the Possible Causes of the DTC P1A58 Buick?

Faulty Hybrid Battery Cut Off Switch
Hybrid Battery Cut Off Switch harness is open or shorted
Hybrid Battery Cut Off Switch circuit poor electrical connection

How to Fix the DTC P1A58 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 P1A58 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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Need Help with the Code?

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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 P1A58 Buick Code

1. What does the OBDII code P1A58 mean on a Buick?

P1A58 indicates "Hybrid Battery Pack Relay Open," meaning the vehicleâ€™s hybrid system has detected an issue with one of the relays in the hybrid battery pack.

2. What are the common symptoms of code P1A58 in a Buick?

Symptoms may include the hybrid system not functioning properly, reduced fuel efficiency, an illuminated check engine light, and possible loss of electric-only mode.

3. What causes the P1A58 code to trigger in a Buick?

Common causes include a faulty hybrid battery relay, damaged wiring or connectors, a malfunctioning hybrid battery control module, or a problem with the hybrid battery itself.

4. Can I drive my Buick with the P1A58 code active?

Driving may still be possible, but itâ€™s not recommended. The hybrid system may be disabled, leading to reduced performance and potential damage to other components.

5. How do mechanics diagnose the P1A58 code on a Buick?

Mechanics typically use a scan tool to read the code and related data, inspect the hybrid battery relays and wiring, and test the hybrid battery control module for faults.

6. How is the P1A58 code fixed on a Buick?

Repairs may include replacing a faulty battery relay, repairing or replacing damaged wiring or connectors, reprogramming or replacing the hybrid battery control module, or addressing hybrid battery issues.

7. Can a dead 12V battery cause the P1A58 code in a Buick?

While unlikely, a weak or dead 12V battery can sometimes trigger hybrid system issues. Testing the 12V battery is a good first step in diagnostics.

8. Does the P1A58 code mean the hybrid battery needs replacement?

Not necessarily. The issue could be with the relay or control module rather than the battery itself. Proper diagnostics are required to confirm the root cause.

9. How much does it cost to repair the P1A58 code on a Buick?

Repair costs vary depending on the cause. Replacing a relay or wiring repair may cost a few hundred dollars, while hybrid battery or control module replacement could be significantly more.

10. Can I reset the P1A58 code on my Buick without repairs?

While you can clear the code with a scan tool, the underlying issue will likely cause the code to return. Itâ€™s important to address the root cause for a permanent fix.