AutoCodes – Buick – P0458 Buick

P0458 Buick Code - Evaporative Emission Purge Solenoid Valve Control Circuit Low Voltage

Quick Answer

The Evaporative Emission (EVAP) Purge Solenoid Valve is used to purge fuel vapor from the EVAP canister to the intake manifold. Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Valve, Evaporative Emission Purge Solenoid Valve harness is open or shorted, Evaporative Emission Purge Solenoid Valve circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0458 Buick indicates Evaporative Emission Purge Solenoid Valve Control Circuit Low Voltage.
Common causes: Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Valve, Evaporative Emission Purge Solenoid Valve harness is open or shorted, Evaporative Emission Purge Solenoid Valve circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 2,107

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0458 Buick Description

The Evaporative Emission (EVAP) Purge Solenoid Valve is used to purge fuel vapor from the EVAP canister to the intake manifold. The EVAP purge solenoid valve is Pulse Width Modulated (PWM). Ignition voltage is supplied directly to the EVAP purge solenoid valve. The Engine Control Module (ECM) controls the solenoid valve by grounding the control circuit with a solid-state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to the ground, or shorted to a voltage by monitoring the feedback voltage. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the EVAP purge solenoid valve control circuit is shorted to the ground within 0.25 s.

OBDII Code P0458 Buick - Evaporative Emission Purge Solenoid Valve Control Circuit Low Voltage - AutoCodes.com — P0458 Buick Code - Evaporative Emission Purge Solenoid Valve Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0458 Buick?

Faulty Evaporative Emission (EVAP) Purge Solenoid Valve
Evaporative Emission Purge Solenoid Valve harness is open or shorted
Evaporative Emission Purge Solenoid Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0458 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 P0458 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 P0458 Buick 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 P0458 Buick Code

1. What does the OBDII code P0458 mean for a Buick?

P0458 indicates that the evaporative emission (EVAP) purge solenoid valve control circuit is experiencing low voltage, which may prevent proper operation.

2. What are the common symptoms of code P0458 in a Buick?

Symptoms may include the check engine light turning on, reduced fuel efficiency, a fuel smell near the vehicle, or difficulty passing an emissions test.

3. What causes code P0458 in a Buick?

Common causes include a faulty purge solenoid valve, damaged or corroded wiring, a blown fuse, or issues with the powertrain control module (PCM).

4. Can I drive my Buick with the P0458 code?

You can usually drive with this code, but it’s recommended to address the issue promptly as it may lead to increased emissions and potential long-term damage to the EVAP system.

5. How do I diagnose the P0458 code on my Buick?

Start by inspecting the wiring and connectors related to the purge solenoid valve for damage, checking the fuse, and testing the solenoid itself for proper operation.

6. How do I fix the P0458 code on my Buick?

Repairs may include replacing the purge solenoid valve, repairing damaged wiring, cleaning corroded connectors, or replacing a blown fuse.

7. How much does it cost to fix a P0458 code on a Buick?

Repair costs can vary, but replacing a purge solenoid valve typically costs $50–$150 for parts and labor, depending on the model and labor rates.

8. What tools do I need to repair the P0458 code on my Buick?

You may need a multimeter to test circuits, a diagnostic scanner to clear the code, and basic hand tools for removing and replacing components.

9. Can a bad gas cap cause the P0458 code on a Buick?

No, a bad gas cap is unlikely to trigger P0458, as this code specifically relates to the purge solenoid circuit rather than the overall EVAP system integrity.

10. Will clearing the P0458 code fix the problem on my Buick?

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