AutoCodes – Generic – P140F

P140F Code - Exhaust Gas Recirculation 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 indicates Exhaust Gas Recirculation 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 4,237

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 Jul 25, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P140F 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 - Exhaust Gas Recirculation Current Performance - AutoCodes.com — P140F Code - Exhaust Gas Recirculation Current Performance

What does this mean?

What are the Possible Causes of the DTC P140F?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P140F Buick — Exhaust Gas Recirculation Current Performance
P140F Cadillac — Exhaust Gas Recirculation Current Performance
P140F Chevrolet — Exhaust Gas Recirculation Motor Current Performance
P140F Ford — EGR Throttle Stuck
P140F GMC — Exhaust Gas Recirculation Motor Current Performance
P140F Lincoln — EGR Throttle Stuck
P140F Mercury — EGR Throttle Stuck

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 Code

1. What does the OBDII code P140F mean?

P140F indicates an issue with the Exhaust Gas Recirculation (EGR) system, specifically relating to its performance or current flow being outside of the expected range.

2. What are the common symptoms of the P140F code?

Symptoms may include a check engine light, rough idling, reduced fuel efficiency, engine hesitation, or increased emissions.

3. What causes the P140F code to appear?

Common causes include a malfunctioning EGR valve, clogged EGR passages, faulty EGR sensors, wiring issues, or carbon buildup in the system.

4. Is it safe to drive with the P140F code?

While the vehicle may still be drivable, ignoring the P140F code can lead to reduced performance, increased emissions, and potential engine damage over time.

5. How can I diagnose the P140F code?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the EGR valve and passages for clogs, checking the wiring and connectors, and testing the EGR sensors for proper function.

6. What repairs are commonly needed for the P140F code?

Repairs may include cleaning or replacing the EGR valve, clearing clogged EGR passages, repairing wiring or connectors, or replacing faulty sensors.

7. Can a dirty EGR valve cause the P140F code?

Yes, carbon buildup or debris in the EGR valve can cause restricted flow and trigger the P140F code.

8. How much does it cost to fix the P140F code?

Repair costs can range from $100 to $500, depending on whether the EGR valve needs cleaning or replacement and if additional parts or labor are required.

9. Can I fix the P140F code myself?

If you have mechanical experience, you may be able to clean the EGR valve or replace faulty components. However, diagnosing electrical issues may require professional tools and expertise.

10. Will clearing the code with an OBDII scanner fix the P140F issue?

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