AutoCodes – GMC – P140F GMC

P140F GMC Code - Exhaust Gas Recirculation Motor Current Performance

Quick Answer

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve 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: P140F GMC indicates Exhaust Gas Recirculation Motor Current Performance.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve 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 1,088

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 Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P140F GMC Description

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. The EGR position sensor provides a signal voltage that changes relative to the EGR position. The EGR position sensor information is transmitted between the EGR valve and the ECM on the signal circuit. The Mass Air Flow (MAF) sensor signal is used by the ECM to detect the proper amount of EGR flow. The ECM will close the EGR valve, then open the EGR valve to 100%. The ECM will then calculate the MAF difference and determine if the proper EGR flow has been detected. The Diagnostic Trouble Code (DTC) will be set when the ECM detects excessive current flow to the EGR motor for greater than 2.5 s.

OBDII Code P140F GMC - Exhaust Gas Recirculation Motor Current Performance - AutoCodes.com — P140F GMC Code - Exhaust Gas Recirculation Motor Current Performance

What does this mean?

What are the Possible Causes of the DTC P140F GMC?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P140F 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 P140F 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 P140F GMC code?

Need more information on how to fix the P140F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P140F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P140F 2014 GMC Sierra — Exhaust Gas Recirculation Motor Current Performance
P140F 2015 GMC Sierra — Exhaust Gas Recirculation Motor Current Performance
P140F 2016 GMC Sierra — Exhaust Gas Recirculation Motor Current Performance
P140F 2017 GMC Sierra — Exhaust Gas Recirculation Motor Current Performance
P140F 2018 GMC Sierra — Exhaust Gas Recirculation Motor Current Performance

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 P140F GMC Code

1. What are the common symptoms of OBDII code P140F GMC?

The common symptoms of code P140F GMC include rough idling, engine stalling, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P140F GMC?

Possible causes of code P140F GMC include a faulty EGR motor, damaged wiring or connectors in the EGR system, clogged EGR passages, or a problem with the EGR valve position sensor.

3. How can I diagnose OBDII code P140F GMC?

Diagnosing code P140F GMC involves using a diagnostic scanner to retrieve the code, checking the EGR system components for any visible damage or blockages, and testing the EGR motor and related circuits for proper functionality.

4. What are the repair options for OBDII code P140F GMC?

Repair options for code P140F GMC may include replacing the EGR motor, repairing or replacing damaged wiring or connectors, cleaning out any clogged EGR passages, or recalibrating the EGR valve position sensor.

5. Can I continue driving with OBDII code P140F GMC?

It is not recommended to continue driving with code P140F GMC present, as it can lead to further damage to the engine or emissions system. It is best to address the issue promptly to prevent any potential complications.

6. How serious is OBDII code P140F GMC?

While code P140F GMC may not cause immediate engine failure, it can impact the performance and emissions of your vehicle. Ignoring this code can lead to decreased engine efficiency and potential long-term damage if left unresolved.

7. How much does it cost to fix OBDII code P140F GMC?

The cost of fixing code P140F GMC can vary depending on the underlying cause of the issue, the labor rates in your area, and the cost of replacement parts. It is recommended to consult a mechanic for a more accurate estimate.

8. Can a DIY enthusiast repair OBDII code P140F GMC?

While some DIY enthusiasts may have the skills to diagnose and repair code P140F GMC, it is recommended to have a professional mechanic handle the repair, especially if you are not familiar with the intricacies of the EGR system.

9. How long does it take to repair OBDII code P140F GMC?

The repair time for code P140F GMC can vary depending on the exact cause of the issue and the availability of parts. In general, a skilled mechanic can typically address this problem within a few hours to a day.

10. How can I prevent OBDII code P140F GMC from recurring?

To prevent code P140F GMC from recurring, it is essential to perform regular maintenance on your vehicle, including cleaning the EGR system components, using quality fuel, and addressing any engine performance issues promptly.