AutoCodes – Mercury – P140C Mercury

P140C Mercury Code - Exhaust Gas Recirculation Control Circuit 'B'

Quick Answer

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation (EGR) Valve. Common causes include Faulty Exhaust Gas Recirculation 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: P140C Mercury indicates Exhaust Gas Recirculation Control Circuit 'B'.
Common causes: Common causes include Faulty Exhaust Gas Recirculation 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 1,140

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 Sep 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P140C Mercury Description

The Powertrain Control Module (PCM) monitors the Exhaust Gas Recirculation (EGR) Valve. The PCM sets the OBDII code when the Exhaust Gas Recirculation Valve is not to factory specifications.

OBDII Code P140C Mercury - Exhaust Gas Recirculation Control Circuit 'B' - AutoCodes.com — P140C Mercury Code - Exhaust Gas Recirculation Control Circuit 'B'

What does this mean?

What are the Possible Causes of the DTC P140C Mercury?

Faulty Exhaust Gas Recirculation Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection

How to Fix the DTC P140C Mercury?

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 P140C Mercury 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 P140C Mercury code?

Need more information on how to fix the P140C Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P140C Mercury code diagnosed by a professional: Find a repair shop in your area

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 P140C Mercury Code

1. What are common symptoms of OBDII code P140C on a Mercury related to the Exhaust Gas Recirculation Control Circuit 'B'?

- Common symptoms include rough idling, reduced fuel efficiency, and potential engine stalling.

2. What are some possible causes of OBDII code P140C on a Mercury vehicle?

- Causes may include a faulty EGR valve, damaged wiring or connectors in the EGR circuit, or a malfunctioning EGR solenoid.

3. How can I diagnose the Exhaust Gas Recirculation Control Circuit 'B' issue on my Mercury?

- A diagnostic scan tool can be used to retrieve the specific OBDII code P140C. Additionally, visually inspecting the EGR valve, solenoid, and related wiring can help identify potential issues.

4. Can driving with an unresolved P140C code cause further damage to my Mercury?

- Continuing to drive with this code may lead to increased emissions, reduced engine performance, and potential damage to other components over time.

5. What are some repair tips for addressing OBDII code P140C on a Mercury?

- Start by checking the EGR valve and related components for any signs of damage or wear. Clean or replace the EGR valve if necessary. Ensure all connections in the EGR circuit are secure.

6. Is it possible to reset the OBDII code P140C on a Mercury without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, the underlying problem causing the code will persist and may reappear.

7. How much does it typically cost to repair OBDII code P140C on a Mercury vehicle?

- The cost of repairs can vary depending on the specific issue causing the code and the labor rates of the repair shop. Costs may range from a simple EGR valve replacement to more extensive wiring repairs.

8. Can a DIY enthusiast with automotive knowledge address OBDII code P140C on a Mercury themselves?

- DIY repair is possible for some causes of the code, such as cleaning or replacing the EGR valve. However, more complex issues may require professional diagnosis and repair.

9. Will fixing OBDII code P140C on my Mercury improve its overall performance and fuel efficiency?

- Resolving the EGR circuit issue causing the code can help restore optimal engine performance, fuel efficiency, and reduce harmful emissions.

10. How often does the Exhaust Gas Recirculation Control Circuit 'B' issue occur in Mercury vehicles?

- While not extremely common, issues related to the EGR system can arise in Mercury vehicles over time, especially in older models or those with high mileage.