AutoCodes – GMC – P140B GMC

P140B GMC 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 GMC 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 3,107

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

What does this mean?

What are the Possible Causes of the DTC P140B 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 P140B 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 P140B 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.

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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 P140B GMC Code

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

- Common symptoms include reduced engine performance, rough idling, stalling, and increased fuel consumption.

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

- Possible causes of this code include a faulty exhaust gas recirculation (EGR) valve, clogged EGR system components, or a malfunctioning EGR sensor.

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

- A thorough inspection of the EGR valve, EGR system components, and EGR sensor using a diagnostic scan tool can help pinpoint the issue.

4. Can a clogged EGR system cause OBDII code P140B GMC?

- Yes, a clogged EGR system, such as blocked passages or a dirty valve, can lead to insufficient exhaust gas recirculation and trigger this code.

5. Is it safe to continue driving with OBDII code P140B GMC?

- It is not recommended to drive with this code as it can lead to further engine damage and decreased fuel efficiency.

6. How can I repair OBDII code P140B GMC?

- Repair options may include cleaning or replacing the EGR valve, clearing any blockages in the EGR system, or replacing the EGR sensor if necessary.

7. Can a dirty air filter cause OBDII code P140B GMC?

- While a dirty air filter can impact engine performance, it is not directly related to the specific issue of EGR slow response increasing flow.

8. Will resetting the OBDII code P140B GMC make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.

9. How can I prevent OBDII code P140B GMC from occurring again?

- Regular maintenance of the EGR system, including cleaning and inspection, can help prevent the recurrence of this code.

10. Can a malfunctioning oxygen sensor trigger OBDII code P140B GMC?

- While an oxygen sensor issue can impact engine performance, OBDII code P140B GMC specifically relates to problems with the EGR system and its components.