AutoCodes – GMC – P148F 2021 GMC Sierra

P148F 2021 GMC Sierra Code - EVAP Purge Pump Voltage Sensor High Voltage

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump 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: P148F 2021 GMC Sierra indicates EVAP Purge Pump Voltage Sensor High Voltage.
Common causes: Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump 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 229

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 Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P148F 2021 GMC Sierra Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, and the Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Voltage is greater than 28.0 V for greater than 1 s.

OBDII Code P148F 2021 GMC Sierra - EVAP Purge Pump Voltage Sensor High Voltage - AutoCodes.com — P148F 2021 GMC Sierra Code - EVAP Purge Pump Voltage Sensor High Voltage

What does this mean?

What are the Possible Causes of the DTC P148F 2021 GMC Sierra?

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

How to Fix the DTC P148F 2021 GMC Sierra?

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 P148F 2021 GMC Sierra 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 P148F 2021 GMC Sierra 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 P148F 2021 GMC Sierra Code

What does the OBDII code P148F mean for a 2021 GMC Sierra?

The code P148F indicates that the EVAP purge pump voltage sensor is detecting a high voltage condition, which can affect the vehicle's evaporative emissions system.

What are common symptoms of the P148F code?

Common symptoms include a check engine light, decreased fuel efficiency, rough idling, or difficulty starting the engine.

What could cause the P148F code to trigger?

Causes may include a faulty EVAP purge pump, wiring issues such as shorts or corrosion in the connectors, or a malfunctioning voltage sensor.

How can I diagnose the P148F code?

To diagnose the P148F code, start by using an OBDII scanner to confirm the code, then visually inspect wiring and connectors, and test the EVAP purge pump and voltage sensor for proper operation.

What repairs are typically needed for the P148F code?

Repairs may involve replacing a faulty EVAP purge pump, repairing damaged wiring or connectors, or replacing the voltage sensor if it is found to be defective.

Can I drive my 2021 GMC Sierra with the P148F code?

While it may be possible to drive the vehicle, it is not recommended as it can lead to increased emissions and potential engine performance issues.

Is it safe to clear the P148F code without making repairs?

Clearing the code without addressing the underlying issue is not advisable, as the problem will likely persist and can lead to further damage or emissions problems.

How can I prevent the P148F code from recurring?

Regular maintenance, inspecting the EVAP system for leaks or damage, and ensuring all electrical connections are secure can help prevent the recurrence of the P148F code.

Will the P148F code affect my vehicle's emissions?

Yes, the P148F code can lead to increased emissions and may cause the vehicle to fail an emissions test due to the malfunction of the evaporative emissions system.

What is the average cost to repair the issues related to the P148F code?

Repair costs can vary widely, but typical expenses may range from $100 to $500 depending on whether you need to replace the EVAP purge pump, fix wiring, or replace the voltage sensor.