AutoCodes – GMC – P148F GMC

P148F GMC 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 GMC 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 322

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

What does this mean?

What are the Possible Causes of the DTC P148F GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P148F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P148F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P148F 2019 GMC Sierra — EVAP Purge Pump Voltage Sensor High Voltage
P148F 2020 GMC Sierra — EVAP Purge Pump Voltage Sensor High Voltage
P148F 2021 GMC Sierra — EVAP Purge Pump Voltage Sensor High Voltage
P148F 2022 GMC Sierra — EVAP Purge Pump Voltage Sensor High Voltage

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 GMC Code

What does the OBDII code P148F mean on a GMC vehicle?

1. The P148F code indicates that the EVAP Purge Pump Voltage Sensor is detecting a high voltage, which may signal an issue with the evaporative emissions control system. 2.

What are common symptoms of the P148F code in GMC vehicles?

Symptoms may include the check engine light turning on, increased fuel odor, difficulty starting the engine, or reduced fuel efficiency. 3.

What causes the P148F code to appear on a GMC vehicle?

Common causes include a faulty EVAP purge pump, damaged wiring or connectors, a malfunctioning voltage sensor, or issues with the PCM (Powertrain Control Module). 4.

Can the P148F code cause drivability issues in my GMC?

Yes, it can cause starting problems, rough idling, or reduced fuel efficiency, but in some cases, the vehicle may run without noticeable performance issues. 5.

How do I diagnose the P148F code on a GMC vehicle?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the EVAP purge pump and its wiring for damage, and testing the voltage sensor with a multimeter. 6.

Is it safe to drive my GMC with the P148F code?

While the vehicle may still be drivable, ignoring the issue could lead to increased emissions, potential damage to other components, and failing an emissions test. 7.

How can I fix the P148F code on my GMC?

Repairs may include replacing the EVAP purge pump, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary. 8.

How much does it cost to repair the P148F code on a GMC?

Repair costs can vary but typically range from $100 to $500, depending on whether the EVAP purge pump, wiring, or PCM needs to be repaired or replaced. 9.

Can a loose gas cap trigger the P148F code on a GMC?

No, a loose gas cap is more likely to trigger codes related to the EVAP system, such as P0456 or P0442, but not P148F, which specifically involves the purge pump voltage sensor. 10.

Do I need to reset the code after fixing the P148F issue on my GMC?

Yes, after completing repairs, you should clear the code with an OBDII scanner and test-drive the vehicle to ensure the issue is resolved.