AutoCodes – Generic – P140B

P140B Code - Exhaust Gas Recirculation Slow Response Increasing Flow

Quick Answer

The Exhaust Gas Recirculation (EGR) valve is an electrically controlled valve that is controlled by the Engine Control Module (ECM). 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: P140B indicates Exhaust Gas Recirculation Slow Response Increasing Flow.
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 12,420

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 P140B Description

The Exhaust Gas Recirculation (EGR) valve is an electrically controlled valve that is controlled by the Engine Control Module (ECM). The EGR allows a specific amount of your exhaust gas into the intake manifold. This exhaust gas mixes with the intake air and cools the combustion process. The recirculated exhaust gas also prevents the formation of nitrogen oxides (NOx). The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the actual EGR flow is higher than a calibrated value for greater than 5 s.

OBDII Code P140B - Exhaust Gas Recirculation Slow Response Increasing Flow - AutoCodes.com — P140B Code - Exhaust Gas Recirculation Slow Response Increasing Flow

What does this mean?

What are the Possible Causes of the DTC P140B?

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 P140B?

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 P140B 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 P140B code?

Need more information on how to fix the P140B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P140B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P140B Buick — Exhaust Gas Recirculation Slow Response Increasing Flow
P140B Cadillac — Exhaust Gas Recirculation Slow Response Increasing Flow
P140B Chevrolet — Exhaust Gas Recirculation Slow Response Increasing Flow
P140B Ford — Exhaust Gas Recirculation Sensor 'C' Circuit High
P140B GMC — Exhaust Gas Recirculation Slow Response Increasing Flow
P140B Lincoln — Exhaust Gas Recirculation Sensor 'C' Circuit High
P140B Mercury — Exhaust Gas Recirculation Sensor 'C' Circuit High

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 P140B Code

1. What are the common symptoms of OBDII code P140B?

- Common symptoms include decreased engine performance, rough idling, stalling, and an illuminated check engine light.

2. What are the possible causes of OBDII code P140B?

- Causes may include a faulty EGR valve, clogged EGR passages, a malfunctioning EGR sensor, or a vacuum leak in the EGR system.

3. How can I diagnose the source of OBDII code P140B?

- Diagnosing the issue may involve visually inspecting the EGR system components, checking for vacuum leaks, testing the EGR valve and sensor, and using a scan tool to monitor EGR system data.

4. Can driving with OBDII code P140B cause further damage to the vehicle?

- Continued driving with this code may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.

5. What are some repair tips for addressing OBDII code P140B?

- Repair tips may include cleaning or replacing the EGR valve, clearing any obstructions in the EGR passages, replacing the EGR sensor, and ensuring proper vacuum levels in the EGR system.

6. Is it safe to continue driving my vehicle with OBDII code P140B?

- It is generally not recommended to drive with this code present, as it can lead to further engine issues and potential failures if left unresolved.

7. How much does it typically cost to repair OBDII code P140B?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from a simple DIY fix to a more involved repair by a mechanic, potentially costing a few hundred dollars.

8. Can OBDII code P140B be triggered intermittently?

- Yes, this code can sometimes be triggered intermittently, especially if the issue is related to a sporadic fault in the EGR system components.

9. Will resetting the check engine light resolve OBDII code P140B?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on.

10. How can I prevent OBDII code P140B from recurring in the future?

- Regular maintenance of the EGR system, using high-quality fuel, and addressing any engine performance issues promptly can help prevent the recurrence of this code.